All Wiring Diagrams for GMC Sierra HD 2012 2500

AIR CONDITIONING

Automatic A/C Wiring Diagram, Except Hybrid (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Except Hybrid (1 of 3) for GMC Sierra HD 2012 2500:

• (left side of headliner) front inside air temperature sensor
• (lower right side of hvac module) blower motor
• (lower right side of hvac module) blower motor control module
• (on right front corner of hvac module) g200
• 4b7
• 5v ref
• A/c ind
• A/c on
• Air temp
• Air tmp
• Air tmp sig
• Amb air tmp
• Ambient air temperature sensor (on left side of radiator support)
• Ambient light/sunload sensor assembly (top center of dash)
• Auto
• B(+)
• Batt pos volt
• Blwr spd
• Colnt lvl
• Computer data lines system
• Defogger system
• Dfrst val
• Driver information center (dic) display
• End of dash)
• Engine coolant level switch (6.6l) (on bottom of surge tank)
• Evaporator temperature sensor (on hvac assembly)
• Fan dn
• Fan up
• Fresh air
• Frnt dfg
• Frt def
• Fsh air
• G103 (on front of right cylinder head)
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Gmlan l
• Ground
• Ground distribution system
• Hvac control module
• Ign 3
• Instrument panel cluster (ipc)
• J106
• J203
• J206 (in i/p harness, near x200 breakout)
• J328
• L air tmp
• Left i/p junction block (lower left side of dash) x1
• Left sunload sensor
• Left temp control
• Lf sunld
• Logic
• Low ref
• Mode ctrl
• Mode dn
• Mode up
• Mtr spd ctrl
• Off
• Power distribution system
• R air tmp
• Rear defog
• Rear dfg
• Recir
• Recir ctrl
• Recirc
• Recirc pos
• Red
• Rer def
• Rf sunld
• Right i/p junction block (in right x4
• Right sunload sensor
• Right temp control
• Serial data
• Tan
• Temp sens
• Upper left air temperature sensor (under upper left side of dash)
• Upper right air temperature sensor (under upper right side of dash)
• X103
• X109

Automatic A/C Wiring Diagram, Except Hybrid (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Except Hybrid (2 of 3) for GMC Sierra HD 2012 2500:

• (left front of engine compt, near fan shroud) engine control module (ecm)
• (lower left side of dash) body control module (bcm)
• (on front of a/c compressor) a/c compressor clutch
• (top left rear of engine) (4.3l) g107
• 4.3l
• 4a1
• 4a2
• 4a3
• 4a4
• 4a5
• 4a6
• 4b2
• 4b3
• 4b5
• 4b6
• 5v ref
• 6.0l
• 6.6l
• 6.6l 4.8l, 5.3l & 6.2l
• A/c cmprsr fuse 17 (except 6.6l) fuse 16 (6.6l) 10a
• A/c cmprsr relay
• Clutch rly ctrl
• Computer data lines system
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l & 6.6l: on top of engine) (6.6l: top front center of engine)
• Engine cooling fan (6.6l) (front center of engine compt)
• Except 6.6l
• Fan rly ctrl
• From pwr/trn relay (diagram 3 of 3)
• G102 (except 4.3l & 6.6l) (on lower left front of engine)
• G103 (on front of right cylinder head)
• Hot at all times
• Hvac batt fuse 39 10a (except 6.6l) fuse 36 (6.6l) 10a
• Hvac blwr fuse 70 40a
• Hvac ign fuse 55 (except 6.6l) fuse 52 (6.6l) 10a
• J105
• Low ref
• Pnk
• Pwrtrn rly ctrl
• Red
• Right i/p junction block (in right end of dash)
• Rly ctrl
• Rly spd sig
• Run/ crnk relay
• Sens sig
• Spd sig
• Tan
• Under- hood fuse block (left side of engine compt)
• X113

Automatic A/C Wiring Diagram, Except Hybrid (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Except Hybrid (3 of 3) for GMC Sierra HD 2012 2500:

• (diesel: left front corner of engine compt) (except diesel: on lower left radiator support)
• (in hvac harness) j242
• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 87a
• Cooling fan diode 1
• Cooling fan diode 2
• Except 6.0l
• Fan cntrl relay
• Fan fuse 68 10a
• Fan hi relay
• Fan lo relay
• Fan relay
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100
• G103 (on front of right cylinder head)
• Gnd
• Hot at all times
• J100
• J101
• J105
• Left air temperature actuator (bottom left of hvac module)
• Left cooling fan (except 6.0l) (left front of engine compt)
• Logic
• Lower left air temperature sensor (left side of hvac module)
• Lower right air temperature sensor (lower left of hvac module)
• Mode actuator (left end of hvac module)
• Pwr/ trn relay
• Recirculation actuator (top right side of hvac module)
• Right air temperature actuator (top middle of hvac module)
• Right cooling fan (right front of engine compt)
• Tan
• To a/c comprsr relay (diagram 2 of 3)
• Under- hood fuse block (left side of engine compt)

Automatic A/C Wiring Diagram, Hybrid (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Hybrid (1 of 3) for GMC Sierra HD 2012 2500:

• (in i/p harness, 14.5 cm from x200 breakout) j206
• (left side of headliner) front inside air temperature sensor
• (on right front corner of hvac module) g200
• 300v+
• 300v-
• 5 volt ref
• 5v ref
• A/c compressor
• A/c ind
• A/c on
• A/c refrig
• A/c refrigerant pressure sensor (right rear of engine compt)
• Accm fuse 3 15a
• Air tmp
• Air tmp sig
• Amb air tmp
• Ambient air temperature sensor (on left side of radiator support)
• Ambient light/sunload sensor assembly (top center of dash)
• Auto
• Auxiliary fuse block (left side of engine compt)
• B(+)
• Blwr spd
• Cab htr pump fuse 4 10a
• Cab htr pump relay
• Computer data lines system
• Cooling pump rly ctrl
• Defogger system
• Dfrst val
• Drive motor generator power inverter module (right rear of engine compt)
• Fan dn
• Fan up
• Fresh air
• Frnt dfg
• Frt def
• Fsh air
• G102 (on lower left front of engine)
• G201 (upper left corner of dash)
• Gmlan l
• Gmlan serial
• Gnd
• Ground
• Ground distribution system
• Heater coolant pump
• Hot at all times
• Hvac control module
• Ign 3
• J203
• J328
• L air tmp
• Left i/p junction block (lower left side of dash) x1
• Left sunload sensor
• Left temp control
• Lf sunld
• Logic
• Low ref
• Mode ctrl
• Mode dn
• Mode up
• Off
• Pnk
• Power distribution system
• R air tmp
• Rear defog
• Rear dfg
• Recir
• Recir ctrl
• Recirc
• Recirc pos
• Rer def
• Rf sunld
• Right sunload sensor
• Right temp control
• Sens sig
• Tan
• Upper left air temperature sensor (under upper left side of dash)
• Upper right air temperature sensor (under upper right side of dash)
• X103
• X150

Automatic A/C Wiring Diagram, Hybrid (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Hybrid (2 of 3) for GMC Sierra HD 2012 2500:

• (lower right side of hvac module) blower motor
• (lower right side of hvac module) blower motor control module
• 4a1
• 4a2
• 4a3
• 4a4
• 4a5
• 4a6
• 4b2
• 4b3
• 4b5
• 4b6
• 5v ref 1
• A/c low pressure sensor
• Batt pos volt
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Data bus +
• Data bus -
• Ect sens sig
• Eng fuse 4 15a
• Engine control module (ecm) (left front of engine compt)
• Engine coolant temperature (ect) sensor (on top of engine)
• G102 (on lower left front of engine)
• G200 (on right front corner of hvac module)
• Ground
• Hi spd fan
• Hot at all times
• Hot w/ pwr/trn relay energized
• Hvac batt fuse 39 10a
• Hvac blwr fuse 70 40a
• Hvac ign fuse 55 10a
• J105
• Low ref
• Low spd fan x3
• Med spd fan
• Mtr spd ctrl
• Pnk
• Power distribution system
• Red
• Right i/p junction block (in right end of dash)
• Rly ctrl
• Run/ crnk relay
• Sens sig
• Tan
• Underhood fuse block (left side of engine compt)
• X120

Automatic A/C Wiring Diagram, Hybrid (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Automatic A/C Wiring Diagram, Hybrid (3 of 3) for GMC Sierra HD 2012 2500:

• (in hvac harness) j242
• (on lower right radiator support) g101
• 87a
• Auxiliary fuse block (left side of engine compt)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan mid 1 relay
• Fan mid 2 relay
• Fan-1 fuse 40a
• Fan-2 fuse 40a
• G100 (on lower left radiator support)
• Hot at all times
• J100
• J101
• J117
• J118
• Left air temperature actuator (bottom left of hvac module)
• Left engine cooling fan (left front of engine compt)
• Left engine cooling fan resistor
• Logic
• Lower left air temperature sensor (left side of hvac module)
• Lower right air temperature sensor (lower left of hvac module)
• Mode actuator (left end of hvac module)
• Pnk
• Recirculation actuator (top right side of hvac module)
• Right air temperature actuator (top middle of hvac module)
• Right cooling fan (right front of engine compt)
• Right engine cooling fan resistor
• Tan

Manual A/C Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Manual A/C Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500:

• (4.3l) g107
• (4.3l: top left rear of engine) (6.6l: on front of right cylinder head) (except 6.6l & 4.3l: on lower left front of engine)
• (6.6l) g103
• (lower right side of hvac module) blower motor
• (lower right side of hvac module) blower motor control module
• 4a2
• 4b7
• 5v ref
• A/c cmprsr fuse 17 (except 6.6l) fuse 16 (6.6l) 10a
• A/c cmprsr relay
• A/c ind
• A/c on
• All times
• Ambient air temperature sensor (w/o odometer security wiring provision) (on left side of radiator support)
• B(+)
• Batt pos volt
• Blower motor control switch
• Blwr spd
• Colnt lvl
• Computer data lines system
• Defogger system
• Dfrst val
• Engine coolant level switch (6.6l) (on bottom of surge tank)
• Evaporator temperature sensor (on hvac assembly)
• Fresh air
• Frh air
• From pwr/trn relay (diagram 3 of 3)
• G102 (except 6.6l & 4.3l)
• G103 (on front of right cylinder head)
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Gmlan l
• Ground
• Hot at
• Hot at all times
• Hvac batt fuse 39 (except 6.6l) fuse 36 (6.6l) 10a
• Hvac blwr fuse 70 (except 6.6l) fuse 65 (6.6l) 40a
• Hvac control module
• Hvac ign fuse 55 (except 6.6l) fuse 52 (6.6l) 10a
• Ign 3
• Interior lights system power distribution
• J105
• J106
• J203
• Led cntl
• Left i/p junction block (lower left side of dash)
• Lo ref
• Logic
• Low ref
• Mode ctrl
• Mode switch
• Mtr spd ctrl
• Pnk
• R air tmp
• Rear defog
• Rear dfg
• Recir
• Recir ctrl
• Recirc
• Red
• Rer def
• Right i/p junction block (in right end of dash) x4
• Run/ crnk relay
• Sens sig
• System
• Tan
• Temp sens
• Temperature control switch
• Under- hood fuse block (left side of engine compt)
• X103
• X109

Manual A/C Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Manual A/C Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500:

• (4.3l) g107
• (4.3l: top left rear of engine) (6.6l: on front of right cylinder head) (except 6.6l & 4.3l: on lower left front of engine)
• (6.6l) g103
• (lower left side of dash) body control module (bcm)
• (on front of a/c compressor) a/c compressor clutch
• 4a1
• 4a4
• 4a6
• 4b3
• 4b5
• 87a
• Cooling fan diode 1
• Cooling fan diode 2
• Except 6.0l
• Fan cntrl relay
• Fan lo relay
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (diesel: left front corner of engine compt) (except diesel: on lower left radiator support)
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l)
• Hi fan relay
• Hot at all times
• J100
• J101
• J105
• Left cooling fan (left front of engine compt)
• Pnk
• Pwr/ trn relay
• Red
• Right cooling fan (right front of engine compt)
• Right i/p junction block (in right end of dash)
• Rly ctrl
• Tan
• Under- hood fuse block (left side of engine compt)

Manual A/C Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Manual A/C Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500:

• (6.6l)
• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• (not used)
• 4.3l
• 4.8l, 5.3l, & 6.2l
• 5v ref
• 6.0l
• 6.6l
• Air temperature actuator (top middle of hvac module)
• Clutch rly ctrl
• Computer data lines system
• Data bus (+)
• Data bus (-)
• Driver information center (dic) display
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l & 6.6l: on top of engine) (6.6l: top front center of engine)
• Engine cooling fan (6.6l) (front center of engine compt)
• Except 6.0l
• Except 6.6l
• Fan fuse 68 10a
• Fan relay
• Fan rly ctrl
• G103 (on front of right cylinder head)
• Gnd
• Hot at all times
• Instrument panel cluster (ipc)
• J105
• Logic
• Low ref
• Mode actuator (left end of hvac module)
• Pwrtrn rly ctrl
• Recirculation actuator (front a/c) (top right side of hvac module)
• Rly spd sig
• Sens sig
• Serial data
• Spd sig
• Tan
• Underhood fuse block (left side of engine compt)
• X113
• X2 a1

ANTI-LOCK BRAKES

Anti Lock Brake Wiring Diagram, Except Hybrid Greater Than/Equal To 8600 GVW with Active Brake Control for GMC Sierra HD 2012 2500

List of elements for Anti Lock Brake Wiring Diagram, Except Hybrid Greater Than/Equal To 8600 GVW with Active Brake Control for GMC Sierra HD 2012 2500:

• (10 series) x131
• (20/30 /31 x300 series)
• (diesel) x300
• (gas) j300
• (upper left corner of dash) g201
• (w/ rear parking assist, low tire pressure & remote entry) j302
• 12-volt ref
• 12-volt ref brake sw sig x3
• 5-volt ref
• A11
• Abs indicator
• Abs-1 fuse 61 (gas) fuse 56 (diesel) 40a
• Angle sensor phase a
• Angle sensor phase b
• Angle sensor phase c
• Auto 4x4 & electronic 4x4
• Battery positive voltage
• Body control module (bcm) (lower left side of dash)
• Brake fluid level switch (on brake master cylinder reservoir)
• Brake pressure modulator valve (bpmv)
• Brake warning indicator
• Can bus high serial data
• Can bus low serial data
• Computer data lines system
• Data bus +
• Data bus - x3
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Except auto 4x4 & electronic 4x4
• Except luxury
• G201 (upper left corner of dash)
• G300 (below driver's door, on body mount)
• G302 (below right side of passenger's seat)
• Gnd
• Ground
• Heavy duty abs fuse 59 (gas) fuse 55 (diesel) 60a
• Hi serial data
• Hot at all times
• I/p multi- function switch
• Instrument panel cluster (ipc)
• Interior lights system
• Ipc fuse 43 (diesel) fuse 46 (gas) 10a
• J201
• J300 (gas)
• Left front wheel speed sensor (wss) (on left front steering knuckle)
• Left i/p junction block (lower left side of dash)
• Left rear wheel speed sensor (wss) (on left rear brake backing plate)
• Lf wheel spd sens sig
• Lo serial data
• Logic
• Low ref
• Lr wheel spd sens sig
• Luxury
• Nca
• Park brake sw sig x5
• Park brake switch (on park brake pedal assembly)
• Power distribution system
• Radio
• Rf wheel spd sens sig
• Right front wheel speed sensor (wss) (on right front steering knuckle)
• Right rear wheel speed sensor (wss) (on right rear brake backing plate)
• Rr wheel spd sens sig
• Serial data
• Serial data bus (+)
• Serial data bus-
• Sig
• Steering angle sens sig
• Steering angle sensor (on steering column)
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Traction control switch
• Traction ctrl sw sig
• Underhood fuse block (left side of engine compt)
• Vehicle spd sig x4
• Vehicle speed signal
• X109
• X115
• X201
• X202
• X202 (w/ front bench seat)
• X205
• Yaw rate & lateral acceleration sensor (under center console trim panel)

Anti Lock Brake Wiring Diagram, Except Hybrid Greater Than/Equal To 8600 GVW without Active Brake Control for GMC Sierra HD 2012 2500

List of elements for Anti Lock Brake Wiring Diagram, Except Hybrid Greater Than/Equal To 8600 GVW without Active Brake Control for GMC Sierra HD 2012 2500:

• (10 series) x131
• (20/30 /31 x300 series)
• (diesel) x300
• (top of brake pedal assembly) stop lamp switch
• 12-volt ref
• 5-volt ref
• Abs indicator
• Abs-1 fuse 61 (gas) fuse 56 (diesel) 40a
• Auto 4x4 & electronic 4x4
• Battery positive voltage
• Body control module (bcm) (lower left side of dash)
• Brake fluid level switch (on brake master cylinder reservoir)
• Brake master cylinder pressure sensor (w/ integrated trailer brake control) (left rear of engine compt)
• Brake pressure modulator valve (bpmv)
• Brake sw sig x3
• Brake warning indicator
• Computer data lines system
• Cyl press sens sig
• Data bus +
• Data bus -
• Diesel
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except auto 4x4 & electronic 4x4
• Except luxury
• G201 (upper left corner of dash)
• G300 (below driver's door, on body mount)
• Gas
• Gnd
• Ground
• Heavy duty abs fuse 59 (gas) fuse 55 (diesel) 60a
• Hot at all times
• Instrument panel cluster (ipc)
• Interior lights system
• Ipc fuse 43 (diesel) fuse 46 (gas) 10a
• J300 (gas)
• Left front wheel speed sensor (wss) (on left front steering knuckle)
• Left i/p junction block (lower left side of dash)
• Lf wheel spd sens sig
• Logic
• Low ref
• Luxury
• Nca
• Park brake sw sig x5
• Park brake switch (on park brake pedal assembly)
• Power distribution system
• Radio
• Rf wheel spd sens sig
• Right front wheel speed sensor (wss) (on right front steering knuckle)
• Serial data
• Serial data bus (+)
• Serial data bus-
• Sig
• Tan
• Underhood fuse block (left side of engine compt)
• Vehicle spd sig
• Vehicle spd sig x4
• X107
• X109
• X202 (w/ front bench seat)
• X205
• X300

Anti Lock Brake Wiring Diagram, Except Hybrid Less Than 8600 GVW for GMC Sierra HD 2012 2500

List of elements for Anti Lock Brake Wiring Diagram, Except Hybrid Less Than 8600 GVW for GMC Sierra HD 2012 2500:

• (10 series)
• (20/30/31 series)
• (diesel)
• (left rear of engine compt) (w/ active brake control) brake booster vacuum sensor
• (on brake master cylinder reservoir) brake fluid level switch
• (on steering column) (w/ active brake control) steering angle sensor
• (or 1827)
• (or 7064)
• (or 817)
• (upper left corner of dash) g201
• 12-volt
• 12-volt ref
• 4.3l
• 5-volt ref
• A11
• Abs indicator
• Abs-1 fuse 61 40a
• Abs-2 fuse 9 25a
• Auto 4x4 & electronic 4x4
• Battery positive voltage
• Body control module (bcm) (lower left side of dash)
• Booster vacuum sens sig
• Brake pressure modulator valve (bpmv)
• Brake sw sig
• Brake warning indicator
• Can bus high serial data
• Can bus low serial data
• Computer data lines system
• Data bus +
• Data bus -
• Data serial
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Except auto 4x4 & electronic 4x4
• Except luxury
• G201 (upper left corner of dash)
• G300 (below driver's door, on body mount)
• G302 (below right side of passenger's seat)
• Gnd
• Ground
• Hot at all times
• I/p multi-function switch (w/ active brake control)
• Instrument panel cluster (ipc)
• Interior lights system
• Ipc fuse 46 (gas) fuse 43 (diesel) 10a
• J x300
• J201
• J300 (gas)
• J302 (w/ keyless entry, active brake control, w/ rear park assist & tpms indicator)
• K x131
• Left front wheel speed sensor (wss) (on left front steering knuckle)
• Left i/p junction block (lower left side of dash)
• Left i/p junction block (lower left side of dash) x1
• Left rear wheel speed sensor (wss) (on left rear brake backing plate)
• Lf wheel spd sens sig
• Logic
• Low ref
• Lr sig wheel spd sens
• Luxury
• Nca
• Park brake switch (on park brake pedal assembly)
• Park brk sw
• Power distribution system
• Radio
• Red
• Rf sig wheel spd sens
• Right front wheel speed sensor (wss) (on right front steering knuckle)
• Right rear wheel speed sensor (wss) (on right rear brake backing plate)
• Rr sig wheel spd sens
• Sensor phase a
• Sensor phase b
• Sensor phase c
• Serial data
• Serial data bus +
• Serial data bus-
• Sig
• Steering angle sens sig
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Traction control switch
• Traction ctrl sw sig
• Underhood fuse block (left side of engine compt)
• Veh spd signal engine control module (ecm) (left front of engine compt, near fan shroud)
• Vehicle spd sig
• Vehicle spd sig x4
• W/ active brake control
• W/o active brake control
• X109
• X115
• X201
• X202
• X202 (w/ front bench seat)
• X205
• X300
• X300 b
• Yaw rate & lateral acceleration sensor (w/ active brake control) (under center console trim panel)

Anti Lock Brake Wiring Diagram, Hybrid for GMC Sierra HD 2012 2500

List of elements for Anti Lock Brake Wiring Diagram, Hybrid for GMC Sierra HD 2012 2500:

• (in instrument panel harness)
• (upper left corner of dash) g201
• 12-volt ref
• 5-volt ref
• Abs indicator
• Abs-1 fuse 61 40a
• Air conditioning system
• Angle sens phase b
• Body control module (bcm) (lower left side of dash)
• Brake fluid level switch (on brake master cylinder reservoir)
• Brake master cylinder piston position sensor (bottom of brake master cylinder)
• Brake pressure modulator valve (bpmv)
• Brake sw sig
• Brake warning indicator
• Computer data lines system
• Cruise/etc/ tcc brk sig
• Data bus +
• Data bus -
• Data serial
• Ecm ign fuse 15a
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Except luxury
• Exterior lights system
• G201 (upper left corner of dash)
• G300 (below driver's door, on body mount)
• Gnd
• Ground
• Heavy duty abs fuse 59 60a
• Hot at all times
• Hot w/ run/crnk relay energized
• I/p multi-function switch
• Ign volt
• Index steering angle sens
• Instrument panel cluster (ipc)
• Interior lights system
• Ipc fuse 10a
• J201
• J241
• J300
• J301
• J313
• J325
• Left front wheel speed sensor (wss) (on left front steering knuckle)
• Left i/p j/b (lower left side of dash) x1
• Left i/p junction block (lower left side of dash)
• Left rear wheel speed sensor (wss) (on left rear brake backing plate)
• Lf sig wheel spd sens
• Logic
• Low ref
• Lr sig wheel spd sens
• Luxury
• Mately 7.5 cm from x109)
• Misc ign fuse 43 10a
• Nca
• Park brake switch (on park brake pedal assembly)
• Park brk sw x5
• Piston position sens sig
• Pnk
• Power distri- bution system
• Power distribution system
• Ptlan +
• Ptlan -
• Radio
• Red
• Rf sig wheel spd sens
• Right front wheel speed sensor (wss) (on right front steering knuckle)
• Right rear wheel speed sensor (wss) (on right rear brake backing plate)
• Rr sig wheel spd sens
• Sens ctrl
• Serial data bus +
• Serial data bus -
• Serial data communication
• Sig
• Steering angle sens
• Steering angle sens sig
• Steering angle sensor (on steering column)
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tan b1
• Traction control switch
• Traction ctrl sw sig
• Underhood fuse block (left side of engine compt)
• Vehicle spd sig
• Vehicle spd sig x4
• X115
• X129
• X201
• X202 (w/ front bench seat)
• X205
• X215
• Yaw rate & lateral acceleration sensor (under center console trim panel)

Trailer ABS Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Trailer ABS Wiring Diagram for GMC Sierra HD 2012 2500:

• (10 series) j300
• (except 10 series) j411
• (in camper harness, 205 cm from x414 breakout) (w/ 5th wheel trailer) j421
• (in chassis harness) j422
• (lower left side of dash) left i/p junction block
• (on left rear body mount) (except 10 series) g401
• 10 series
• 6.6l w/o 10 series
• Comm data
• Computer data lines system
• Except 10 series
• Except 6.6l
• Exterior lights system
• Fscm fuse 21 25a
• G300 (10 series) (below driver's door, on body mount)
• Gmlan +
• Gmlan -
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign 1 volt
• Interior lights system
• Itbc fuse 6 fuse 19 15a
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Pnk
• Power distribution system
• Rly enable
• Rly feedback
• Stop lamp switch (top of brake pedal assembly)
• Stud 2 fuse 63 fuse 58 30a
• Tan
• Tcc brk sig
• Trailer brake control module (tbcm) (except 10 series) fuel pump/trailer brake control module (tbcm) (10 series) (20/30 series: left rear frame rail) (31 series: on left frame rail) (fuel pump/trailer brake control module (tbcm): rear frame, near spare tire mount)
• Trailer brake control switch
• Trailer brake controller solid state relay (20/30 series: left rear frame rail) (31 series: on left frame rail)
• Trailer connector (at rear of vehicle)
• Trl brk rly
• Trl brk sig
• Underhood fuse block (left side of engine compt)
• W/ 5th wheel trailer
• W/ heavy duty trailer harness
• X102
• X205
• X414

ANTI-THEFT

Anti-theft Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Anti-theft Wiring Diagram for GMC Sierra HD 2012 2500:

• (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt) engine control module (ecm)
• (in spo theft harness)
• (in spo theft harness) j228
• (w/ active brake controls & door ajar indicator)
• 3b2
• 4a7
• 6.0l (vin j)
• 6.6l
• Acc
• Acc v
• Ant
• Auxiliary fuse block (left side of engine compt)
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Coax
• Computer data lines system
• Ddm fuse 4 15a
• Dim fuse 7 10a
• Distribution system power
• Dlis fuse 35 fuse 32 2a
• Dr key sw
• Driver door lock switch
• Driver door lock/ window switch
• Driver information center (dic) display
• Dsm fuse 25 10a
• Except 6.0l (vin j)
• Except 6.6l
• Exterior lights system
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• G302 (below right side of passenger's seat)
• Gmlan
• Gnd
• Grd
• Ground distribution system
• Hdlp rly
• Headlights system
• Hood ajar sw sig
• Hood ajar switch (part of hood latch assembly)
• Hood sw sig
• Horn rly
• Horns system
• Hot at all times
• I/p fuse block (left side of dash)
• Ignition switch
• Instrument panel cluster (ipc)
• Interior lights system
• Interior lights system computer data lines system
• Intrus sig
• J101
• J114
• J115
• J213
• J227
• J230
• Keyless entry antenna
• Left i/p junction block (lower left x5 side of dash)
• Lf ajar sw
• Lock
• Logic
• Lr ajar sw
• Nca
• Off
• Passenger door lock/ window switch
• Pdm fuse 9 (w/ comfort & decor level 3 convenience package) 15a
• Power distribution system
• Prl lp rly
• Remote control door lock receiver (rcdlr) (top rear of passenger compt)
• Rf ajar sw
• Rf dr ajr sw
• Right i/p junction block (in right end of dash)
• Right i/p junction block (in right x2 end of dash)
• Rr ajar sw
• Run
• Sec ind
• Security ind
• Security indicator lamp
• Seo b1 fuse 52 fuse 49 15a
• Sns sig
• Start
• Sw sig
• Tan
• Theft deterrent control module (on right side of steering column)
• Underhood fuse block (left side of engine compt)
• Unlock
• Vehicle inclination sensor
• Vehicle shock sensor
• Volt
• W/ individual front seat & power mirror
• W/ keyless entry & pto
• W/ remote keyless entry & pto
• X103
• X227

BODY CONTROL MODULES

Body Control Modules Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Body Control Modules Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500:

• (not used)
• 12 volt ref
• 5 volt ref
• Acc
• Accessory volt
• Ambient lt sens sig
• Anti-lock brakes system
• Battery +
• Body control module (bcm) (lower left side of dash)
• Courtesy lamps ctrl
• Cruise control system
• Cruise ctrl sw sig
• Dim fuse 7 10a
• Exterior lights system
• Hazard sw left turn sig
• Hazard sw right turn sig
• Hazard sw sig
• Headlamp dim sw sig
• Headlamp flash to pass sig
• Headlamp sw headlamp off sig
• Headlamp sw headlamp on sig
• Headlamp sw park lamp sig
• Headlights & exterior lights systems
• Headlights system
• Hot at all times
• I/p fuse block (left side of dash)
• I/p lamps dim ctrl
• Ig 3 volt
• Ign 1 volt
• Ignition switch (in upper steering column)
• Interior lamp defeat sw sig
• Interior lights system
• J213
• Key in ignition switch
• Low ref
• Off
• Pnk
• Power distribution system
• Run
• Shift interlock system
• Sound systems
• Sound, cruise control & transmissions systems
• Start
• Steer whl ctrl sw sig
• Tan
• Tap up/tap down sw sig
• Tow/haul sw sig
• Traction ctrl sw sig
• Transmissions system
• Windshield wash sw sig
• Wiper sw hi sig
• Wiper sw low sig
• Wiper/washer system
• X201

Body Control Modules Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Body Control Modules Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500:

• (gas) (diesel)
• 12v ref
• 5volt ref
• Accessory wakeup serial data
• Anti-lock brakes & exterior lights systems
• Anti-theft system
• Battery +
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Cruise control & seats systems
• Cruise ctrl ind dim sig
• Ctsy fuse 5 15a
• Drl relay ctrl
• Exhaust brk sw sig
• Exterior lights system
• Fog lamp relay ctrl
• Front fog lamp sw sig/enable
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Ground
• Headlamp hi beam relay ctrl
• Headlights system
• Hi spd gmlan serial data bus (+)
• Hi spd gmlan serial data bus (-)
• Hood ajar sw sig
• Hot at all times
• I/p fuse block (left side of dash)
• I/p lamp dimmer sw sig
• Indicator dim ctrl
• Instrument cluster system
• Interior lights & exterior lights systems
• Interior lights system
• Ipc fuse 46 fuse 43 10a
• Is lps fuse 17 10a
• Led backlight dim ctrl
• Liner interconnect bus
• Lo spd serial data
• Low ref
• Lt stop trn fuse 6 15a
• Lt trlr turn sig lamp
• Power distribution system
• Rt stop trn fuse 8 15a
• Rt trlr turn sig lamp
• Run/crank relay ctrl
• Security ind ctrl
• Serial data comm enable
• Stop lamps fuse 12 15a
• Stp lp sw sig
• Tan
• Underhood fuse block (left side of engine compt)
• Washer relay ctrl
• Wiper motor park sw sig
• Wiper/washer system
• X109

Body Control Modules Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Body Control Modules Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500:

• 12 volt ref
• Anti-theft system
• Backup lamp relay ctrl
• Body control module (bcm) (lower left side of dash)
• Cruise/etc/tcc brake sig
• Current sens sig
• Door lk ctrl
• Door locks system
• Door unlk ctrl
• Drvr door key sw sig
• Drvr door lk sw lk sig
• Drvr door lk sw unlk sig
• Drvr door unlk relay ctrl
• Exhaust brk sw ctrl
• Exterior lights & navigation systems
• Exterior lights system
• Front windshield sw hi sig ctrl
• Headlamp lo beam relay ctrl
• Headlights system
• Hood closed sw sig
• Horn relay ctrl
• Horns system
• Ign 3 voltage
• Instrument cluster system
• Interior lights system
• Intrusion sens alarm on sig
• Intrusion sens armed sig
• Lf door ajar sw sig
• Low ref
• Lr door ajar sw sig
• Out of park sig
• Park brake sw sig
• Park lamp relay ctrl
• Pass door lk sw lk sig
• Pass dr lk sw unlk sig
• Pnk
• Power distribution system
• Power windows system
• Pwr win mstr sw lkout rear sig
• Pwr win mstr sw lkout sig
• Pwr win mstr sw lr dn sig
• Pwr win mstr sw lr up sig
• Pwr win mstr sw rr dn sig
• Pwr win mstr sw rr up sig
• Rf door ajar sw sig
• Rr door ajar sw sig
• Seats system
• Starting/charging system
• Tan
• Transmissions system
• Warning, instrument cluster, anti-lock brakes & headlights systems
• Wiper sw sig 2
• Wiper/washer system

COMPUTER DATA LINES

Computer Data Lines Wiring Diagram, Except Hybrid (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Except Hybrid (1 of 3) for GMC Sierra HD 2012 2500:

• (in i/p extension harness, behind left side of dash) splice pack jx223
• (lower left side of dash) left i/p junction block
• (not used)
• (not used) b
• (not used) e
• (not used) f
• (not used) j
• (not used) l
• (under front passenger's seat) splice pack jx339
• 2 or more
• 3b1
• A10
• A15
• Audio amplifier (if equipped) (under rear of center console)
• Body control module (bcm) (lower left side of dash)
• C (not used)
• Chime module (center of dash, behind radio)
• Data link connector (dlc) (lower left side of dash)
• Digital radio receiver (behind right end of dash)
• Digital radio receiver (if equipped) (behind right end of dash)
• Driver door lock/window switch
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Ground distribution system
• Heated seat control module (w/ spo heated seats)
• Hot at all times
• Hvac control module
• I/p fuse block (left side of dash)
• Inflatable restraint front passenger presence system (pps) module (if equipped) (under front passenger seat)
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Instrument panel cluster (ipc)
• J200
• Left i/p junction block (lower left side of dash)
• Low spd gmlan ser data
• Low speed gmlan serial data
• Low speed serial data
• Low speed serial data x7
• Ltr fuse 53 (except 6.6l) fuse 50 (6.6l) 20a
• Memory seat module (w/ individual front seat) (under front of driver's seat)
• Of w/ onstar, digital radio & rear seat & earphone jacks radio control
• Passenger door lock/window switch
• Power distribution system
• Radio
• Rear object sensor control module (at rear cargo area, behind trim panel)
• Rear seat audio (rsa) control
• Rear seat audio (rsa) control (if equipped)
• Remote control door lock receiver (rcdlr) (top rear of passenger compt)
• Right i/p junction block (in right end of dash)
• Splice pack jx221 (in i/p harness, behind left side of dash)
• Tan
• Theft deterrent control module (tdm) (on right side of steering column)
• Underhood fuse block (left side of engine compt)
• Vehicle communication interface module (vcim) (behind center of dash)
• Vehicle communication interface module (vcim) (if equipped) (behind center of dash)
• W/ digital radio
• W/ digital radio, rear seat, onstar & earphone jacks radio control
• W/ front bench seat
• W/ front seat & remote control
• W/ individual front seat
• W/ luxury edition
• W/ onstar
• W/ radio provisions
• W/ rear parking assist
• W/ rear seat & earphone jacks radio control
• W/ remote keyless entry
• W/o individual front seat
• W/o luxury edition
• W/o luxury edition & w/ odometer security provisions
• W/o radio provisions
• X201
• X202
• X212
• X301
• X303
• X305
• X331

Computer Data Lines Wiring Diagram, Except Hybrid (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Except Hybrid (2 of 3) for GMC Sierra HD 2012 2500:

• (4.8l, 5.3l & 6.2l) j338
• (lower left side of dash) (w/ two speed transfer case) transfer case shift control module
• 4.8l, 6.2l & 5.3l
• 8600 gvm w/ active brake control
• 8600 gvw w/o active brake control
• Can bus hi serial data
• Can bus low serial data
• Comm enable serial data
• Data link resistor (in chassis harness, on left rear chassis cross member)
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Except 4.8l, 6.2l & 5.3l
• Fuel pump flow control module (4.8l, 6.2l & 5.3l) (rear frame, near spare tire mount)
• Hi serial data
• Hi spd gmlan (+)
• Hi spd gmlan (-)
• Hi spd gmlan serial data ( +)
• Hi spd gmlan serial data (+)
• Hi spd gmlan serial data (-)
• Left i/p junction block (lower left side of dash)
• Less than 8600 gvm
• Lo serial data
• Serial data (-) hi spd gmlan
• Serial data comm enable
• Tan
• Trailer brake
• Trailer brake controller module (tbcm) (integrated trailer brake w/o 10 series) fuel pump/trailer brake control module (integrated trailer brake w/ 10 series) (20/30 series: left rear frame rail) (31 series: on left frame rail)
• Vehicle communication interface module (vcim) (behind center of dash)
• W/ active brake control except 10 series
• W/ hydraulic brakes
• W/ onstar
• W/ trailer brake
• W/ two speed transfer case
• W/o
• W/o integrated trailer brake control
• W/o onstar
• W/o trailer brake
• W/o two speed transfer case
• X115
• X202
• Yaw rate & lateral acceleration sensor (w/ active brake control) (under center console trim panel)

Computer Data Lines Wiring Diagram, Except Hybrid (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Except Hybrid (3 of 3) for GMC Sierra HD 2012 2500:

• (left front of engine compt, near fan shroud) transmission control module (tcm)
• (outside of right front chassis frame) power take off (pto) module
• 2wd
• 4.3l
• 4.8l, 5.3l & 6.2l
• 4wd
• 6.0l
• 6.6l
• Accessory wakeup serial data
• Accessory wakeup serial data linear interconnect network bus
• Automatic transmission
• B10
• Body control module (bcm) (lower left side of dash)
• Control solenoid valve assembly
• Electronic compass module
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 6.6l
• Glow plug control module (gpcm) (6.6l) (right front side of engine)
• Hi spd gmlan serial data (+)
• Hi spd gmlan serial data (-)
• High speed gmlan serial data bus (+)
• High speed gmlan serial data bus (+) ser data comm enable
• High speed gmlan serial data bus (-)
• J104 (6.6l: in engine harness, 5 cm from engine control module connector breakout)
• J222 (w/ pto) (in instrument panel harness)
• Left i/p block junction (lower left side of dash)
• Nitrogen oxides sensor 1 (in exhaust, top left rear rear side of engine)
• Nitrogen oxides sensor 2 (in exhaust, middle of diesel particulate filter)
• Power take off (pto) module (outside of right front chassis frame)
• Reductant sensor module (above reductant tank)
• S x300
• Ser data commu- nication enable
• Speed a/t
• Tan
• Terminator
• W/ pto
• W/o pto
• X10
• X107
• X109
• X123
• X395

Computer Data Lines Wiring Diagram, Hybrid (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Hybrid (1 of 3) for GMC Sierra HD 2012 2500:

• (in i/p extension harness, behind left side of dash) splice pack jx223
• (lower left side of dash) left i/p junction block
• (not b
• (not f
• (not used)
• (under front passenger's seat) splice pack jx339
• 2 or more
• 3b1
• A/c compressor
• A10
• A15
• Audio amplifier (if equipped) (under rear of center console)
• C (not used)
• Chime module (center of dash, behind radio)
• Data link connector (dlc) (lower left side of dash)
• Digital radio receiver (behind right end of dash)
• Digital radio receiver (if equipped) (behind right end of dash)
• Driver door lock/window switch (if equipped)
• Eter security
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Ground distribution system
• Heated seat control module (w/ spo heated seats)
• Hot at all times
• Hvac control module
• I/p fuse block (left side of dash)
• Inflatable restraint front passenger presence system (pps) module (if equipped) (under front passenger seat)
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Instrument panel cluster (ipc)
• J200
• L (not used)
• Left i/p junction block (lower left side of dash)
• Low speed gmlan serial data
• Low speed serial data
• Low speed serial data x7
• Ltr fuse 53 20a
• Memory seat module (w/ individual front seat) (under front of driver's seat)
• Of w/ onstar, digital radio & rear seat & earphone jacks radio control
• Passenger door lock/window switch (if equipped)
• Radio
• Rear object sensor control module (at rear cargo area, behind trim panel)
• Rear seat audio (rsa) control
• Rear seat audio (rsa) control (if equipped)
• Remote control door lock receiver (rcdlr) (top rear of passenger compt)
• Right i/p junction block (in right end of dash)
• Splice pack jx221 (in i/p harness, behind left side of dash)
• Tan
• Theft deterrent control module (tdm) (on right side of steering column)
• Underhood fuse block (left side of engine compt)
• Used)
• Vehicle communication interface module (vcim) (behind center of dash)
• Vehicle communication interface module (vcim) (if equipped) (behind center of dash)
• W/ digital radio
• W/ digital radio, rear seat, onstar & earphone jacks radio control
• W/ front bench seat
• W/ front seat & remote control
• W/ individual front seat
• W/ luxury edition
• W/ onstar
• W/ provisions odom-
• W/ radio provisions
• W/ rear parking assist
• W/ rear seat & earphone jacks radio control
• W/ remote keyless entry
• W/o individual front seat
• W/o luxury edition
• W/o luxury edition &
• W/o radio provisions
• X150
• X201
• X202
• X212
• X301
• X303
• X305
• X331

Computer Data Lines Wiring Diagram, Hybrid (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Hybrid (2 of 3) for GMC Sierra HD 2012 2500:

• (lower left side of dash) (w/ two speed transfer case) transfer case shift control module
• (lower left side of dash) left i/p junction block
• (under second row seats) drive motor generator battery
• Accessory wakeup serial data
• Automatic transmission
• Body control module (bcm) (lower left side of dash)
• Control solenoid valve assembly
• Data link resistor (in chassis harness, on left rear chassis cross member)
• Drive motor generator battery control module
• Electronic compass module
• Electronic power steering motor control module (right rear of engine compt)
• Fuel pump flow control module (rear frame, near spare tire mount)
• Hi spd gmlan (+)
• Hi spd gmlan (-)
• Hi spd gmlan serial data (+)
• Hi spd gmlan serial data (-)
• High speed gmlan serial data bus (+)
• High speed gmlan serial data bus (-)
• J222 (in instrument panel harness)
• J338 w/ intergrated trailer brake control) (in chassis harness)
• Left i/p junction block (lower left side of dash)
• Linear interconnect network bus
• Low spd serial data
• Nca ser data bus (+)
• Nca ser data bus (-)
• Nca ser data commu- nication enable
• Network bus
• Pnk
• Red
• Ser data bus (+)
• Ser data bus (-)
• Ser data comm enable
• Ser data enable
• Serial data
• Serial data comm enable
• Tan
• Trailer brake controller module (tbcm) (w/o 10 series) fuel pump/trailer brake control module (w/ 10 series) (20/30 series: left rear frame rail) (31 series: on left frame rail)
• Vehicle communication interface module (vcim) (behind center of dash)
• W/ trailer brake
• W/ two speed transfer case
• W/o trailer brake
• W/o two speed transfer case
• Wake up sig
• Wakeup serial data
• X10
• X109 b8
• X129
• X150
• X202
• X215
• X350

Computer Data Lines Wiring Diagram, Hybrid (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Computer Data Lines Wiring Diagram, Hybrid (3 of 3) for GMC Sierra HD 2012 2500:

• (in instrument panel harness) j225
• A4 pnk
• Accessory dc power control module (right rear of engine compt)
• Apm wake-up
• Auxiliary fuse block (left side of engine compt)
• Batt positive volt
• Becm fuse 10 15a
• Data link resistor 2
• Detection sens sig
• Drive motor generator power inverter module (right rear of engine compt)
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Engine control module (ecm) (left front of engine compt)
• G200 (on right front corner of hvac module)
• G3 pnk
• Gnd
• High speed gmlan serial data bus (+)
• High speed gmlan serial data bus (-)
• High voltage circuit impact detection sensor
• Hot at all times
• Hot w/ run/crnk relay energized
• Ication enable
• Ign volt
• J200
• J226 (in instrument panel harness)
• J240 (in instrument panel harness)
• Left i/p junction block (lower left side of dash)
• Low ref
• Low speed gmlan serial data
• Misc ign fuse 43 10a
• Pnk
• Power distribution system
• Ptlan +
• Ptlan -
• Ptlan - yaw rate & lateral acceleration sensor (under center console trim panel)
• Ser data bus (+)
• Ser data bus (-)
• Ser data commun-
• Serial data
• Serial data gateway (sdg) module
• Serial data wake-up sig
• Signal
• Tan
• Underhood fuse block (left side of engine compt)
• Wake up sig
• Wake up signal
• Wake-up sig
• Wakeup serial data
• X103
• X129
• X150
• X215
• X300

COOLING FAN

4.3L VIN X

4.3L VIN X, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 4.3l
• 4.8l, 5.3l & 6.2l
• 5v ref
• 87a
• Computer data lines system
• Cooling fan diode 1
• Cooling fan diode 2
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l: on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan rly ctrl
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Hot at all times
• J100
• J101
• Left cooling fan (left front of engine compt)
• Low ref
• Pwr/ trn relay
• Pwrtrn rly ctrl
• Right cooling fan (right front of engine compt)
• Sens sig
• Tan
• Under- hood fuse block (left side of engine compt)

4.8L VIN A

4.8L VIN A, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 4.3l
• 4.8l, 5.3l & 6.2l
• 5v ref
• 87a
• Computer data lines system
• Cooling fan diode 1
• Cooling fan diode 2
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l: on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan rly ctrl
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Hot at all times
• J100
• J101
• Left cooling fan (left front of engine compt)
• Low ref
• Pwr/ trn relay
• Pwrtrn rly ctrl
• Right cooling fan (right front of engine compt)
• Sens sig
• Tan
• Under- hood fuse block (left side of engine compt)

5.3L VIN 0

5.3L VIN 0, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 4.3l
• 4.8l, 5.3l & 6.2l
• 5v ref
• 87a
• Computer data lines system
• Cooling fan diode 1
• Cooling fan diode 2
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l: on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan rly ctrl
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Hot at all times
• J100
• J101
• Left cooling fan (left front of engine compt)
• Low ref
• Pwr/ trn relay
• Pwrtrn rly ctrl
• Right cooling fan (right front of engine compt)
• Sens sig
• Tan
• Under- hood fuse block (left side of engine compt)

5.3L VIN 7

5.3L VIN 7, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 4.3l
• 4.8l, 5.3l & 6.2l
• 5v ref
• 87a
• Computer data lines system
• Cooling fan diode 1
• Cooling fan diode 2
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l: on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan rly ctrl
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Hot at all times
• J100
• J101
• Left cooling fan (left front of engine compt)
• Low ref
• Pwr/ trn relay
• Pwrtrn rly ctrl
• Right cooling fan (right front of engine compt)
• Sens sig
• Tan
• Under- hood fuse block (left side of engine compt)

6.0L VIN J

6.0L VIN J, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• 87a
• Auxiliary fuse block (left side of engine compt)
• Computer data lines system
• Data bus +
• Data bus -
• Ect sens sig
• Eng fuse 4 15a
• Engine control module (ecm) (left front of engine compt)
• Engine coolant temperature (ect) sensor (on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan mid 1 relay
• Fan mid 2 relay
• Fan-1 fuse 40a
• Fan-2 fuse 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Gmlan l
• Hi spd fan rly
• Hot at all times
• Hot w/ pwr/trn relay energized
• Hvac control module
• J100
• J101
• J117
• J118
• Left cooling fan (left front of engine compt)
• Left engine cooling fan resistor
• Logic
• Low ref
• Low spd fan rly
• Med spd fan rly
• Pnk
• Power distribution system
• Right cooling fan (right front of engine compt)
• Right engine cooling fan resistor
• Tan
• Underhood fuse block (left side of engine compt)

6.0L VIN J, Hybrid Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• 5v ref
• Air inlet drive motor battery temperature sensor
• Air outlet drive motor battery temperature sensor
• Auxiliary fuse block (left side of engine compt)
• Becm fan fuse 2 15a
• Computer data lines system
• Cool pump fuse 6 15a
• Cool pump relay
• Data bus +
• Data bus -
• Drive motor battery temperature sensor 1
• Drive motor battery temperature sensor 2
• Drive motor battery temperature sensor 3
• Drive motor battery temperature sensor 4
• Drive motor generator battery (under second row seats)
• Drive motor generator battery control module
• Engine control module (ecm) (left front of engine compt)
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• G311
• Generator battery vent fan
• Generator battery vent fan relay
• Generator control module temperature sensor
• Gnd
• Hot at all times
• In temp sens rtn
• In temp sens sig
• J100
• J101
• J119
• J395
• Left generator control module coolant pump
• Low ref
• Low temp cooling pump mtr gnd
• Not used
• Out temp sens rtn
• Out temp sens sig
• Red
• Right generator control module coolant pump
• Rly ctrl
• Tan
• Temp sens rtn 1
• Temp sens rtn 2
• Temp sens rtn 3
• Temp sens rtn 4
• Temp sens sig 1
• Temp sens sig 2
• Temp sens sig 3
• Temp sens sig 4
• X120
• X150
• X215
• X350

6.2L VIN 2

6.2L VIN 2, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Cooling Fan Wiring Diagram for GMC Sierra HD 2012 2500:

• (near compressor, on a/c high pressure hose) a/c refrigerant pressure sensor
• 4.3l
• 4.8l, 5.3l & 6.2l
• 5v ref
• 87a
• Computer data lines system
• Cooling fan diode 1
• Cooling fan diode 2
• Data bus (+)
• Data bus (-)
• Ect sens sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (4.3l: left side of engine) (except 4.3l: on top of engine)
• Fan cntrl relay
• Fan hi relay
• Fan lo relay
• Fan rly ctrl
• Fan-1 fuse 60 40a
• Fan-2 fuse 62 40a
• G100 (on lower left radiator support)
• G101 (on lower right radiator support)
• Hot at all times
• J100
• J101
• Left cooling fan (left front of engine compt)
• Low ref
• Pwr/ trn relay
• Pwrtrn rly ctrl
• Right cooling fan (right front of engine compt)
• Sens sig
• Tan
• Under- hood fuse block (left side of engine compt)

CRUISE CONTROL

4.3L VIN X

4.3L VIN X, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• (left front of engine compt, near fan shroud)
• 12v ref
• 5 volt ref
• 5v ref
• 5v ref 2
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• B10
• Bat pos volt
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Computer data lines system
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Electric shift control transfer case
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G103 (on front of right cylinder head)
• G106 (right rear of engine)
• G201 (upper left corner of dash)
• Gmlan data bus+
• Gmlan data bus-
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus(+)
• Hi spd gmlan ser data bus(-)
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Low ref 1
• Pnk
• Power distribution system
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp cp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• W/ two speed push button & electric shift control transfer case
• W/o two speed push button &
• X109
• X201
• X205

4.8L VIN A

4.8L VIN A, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• (left front of engine compt, near fan shroud)
• 12v ref
• 5 volt ref
• 5v ref
• 5v ref 1
• 5v ref 2
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• B10
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Computer data lines system
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan data bus+
• Gmlan data bus-
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus(+)
• Hi spd gmlan ser data bus(-)
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Pnk
• Power distribution system
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp cp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• W/ active 2 speed push button control transfer case
• W/o active 2 speed push button control transfer case
• X109
• X201
• X205

5.3L VIN 0

5.3L VIN 0, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• 12v ref
• 5 volt ref
• 5v ref
• 5v ref 2
• 6.0l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• Automatic transmission
• B10
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Column harness)
• Computer data lines system
• Control solenoid valve assembly
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Data bus +
• Data bus -
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 6.0l
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus+
• Hi spd gmlan ser data bus-
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Input shaft speed sensor (iss)
• Input speed sensor (iss) signal
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J127
• J216 (in steering pnk
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Output shaft speed sensor (oss)
• Output speed sensor (oss) signal
• Pnk
• Power distribution system
• Red
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp cp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Transmissions system
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (w/ transfer case) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• W/ 2 speed automatic transfer case
• W/ 2 speed manual transfer case
• X109
• X201
• X205

5.3L VIN 7

5.3L VIN 7, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• 12v ref
• 5 volt ref
• 5v ref
• 5v ref 2
• 6.0l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• Automatic transmission
• B10
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Column harness)
• Computer data lines system
• Control solenoid valve assembly
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Data bus +
• Data bus -
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 6.0l
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus+
• Hi spd gmlan ser data bus-
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Input shaft speed sensor (iss)
• Input speed sensor (iss) signal
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J127
• J216 (in steering pnk
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Output shaft speed sensor (oss)
• Output speed sensor (oss) signal
• Pnk
• Power distribution system
• Red
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp cp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Transmissions system
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (w/ transfer case) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• W/ 2 speed automatic transfer case
• W/ 2 speed manual transfer case
• X109
• X201
• X205

6.0L VIN J

6.0L VIN J, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• 12v ref
• 5 volt ref
• 5v ref 1
• 5v ref 2
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• Automatic transmission
• Automatic transmission output shaft speed (oss) sensor
• B10
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Computer data lines system
• Control solenoid valve assembly
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Data bus +
• Data bus -
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Engine control module (ecm) (left front of engine compt)
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus(+)
• Hi spd gmlan ser data bus(-)
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J216 (in steering column harness)
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Out spd sens (oss) sig out spd sens (oss) sig
• Pnk
• Power distribution system
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp lp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Transmissions system
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (w/ transfer case) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• X109
• X176
• X201
• X205

6.2L VIN 2

6.2L VIN 2, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Cruise Control Wiring Diagram for GMC Sierra HD 2012 2500:

• 12v ref
• 5 volt ref
• 5v ref
• 5v ref 2
• 6.0l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• App sen 1 sig
• App sen 2 sig
• Automatic transmission
• B10
• Batt +
• Body control module (bcm) (lower left side of dash)
• Brake pedal position (bpp) sensor
• Cancel
• Column harness)
• Computer data lines system
• Control solenoid valve assembly
• Cruise control ind dimming sig
• Cruise control switch signal
• Cruise ind
• Cruise switch
• Data bus +
• Data bus -
• Dim fuse 7 10a
• Ecm batt fuse 12 10a
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 6.0l
• G103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Ground
• Ground distribution system
• Hi spd gmlan ser data bus+
• Hi spd gmlan ser data bus-
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Input shaft speed sensor (iss)
• Input speed sensor (iss) signal
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J106
• J127
• J216 (in steering pnk
• J217 (9 cm from inflatable restraint steering wheel module coil x2)
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch assembly
• Logic
• Low ref
• Output shaft speed sensor (oss)
• Output speed sensor (oss) signal
• Pnk
• Power distribution system
• Red
• Res+
• Ser data
• Ser data bus(+)
• Ser data bus(-)
• Set-
• Sound systems
• Stp cp sw sig
• Tac motor ctrl-1
• Tac motor ctrl-2
• Tan
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• Transmission control module (tcm)
• Transmissions system
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (w/ transfer case) (on transfer case tailshaft housing)
• Vss hi sig
• Vss lo sig
• W/ 2 speed automatic transfer case
• W/ 2 speed manual transfer case
• X109
• X201
• X205

DEFOGGERS

Heated Mirrors Wiring Diagram, with Power Folding Mirror for GMC Sierra HD 2012 2500

List of elements for Heated Mirrors Wiring Diagram, with Power Folding Mirror for GMC Sierra HD 2012 2500:

• 3b2
• 4a7
• B4 x4
• Batt pos volt
• Computer data lines system
• Ddm fuse 4 15a
• Driver door lock/ window switch
• Driver outside rearview mirror
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Ground
• Ground distribution system
• Hot at all times
• Hvac control module
• I/p fuse block (left side of dash)
• Logic
• Low ref
• Passenger door lock/window switch
• Passenger outside rearview mirror
• Pdm fuse 9 15a
• Power distribution system
• Rear defogger ind
• Rear defogger switch
• Right i/p junction block (in right end of dash)
• Serial data

Heated Mirrors Wiring Diagram, without Power Folding Mirror for GMC Sierra HD 2012 2500

List of elements for Heated Mirrors Wiring Diagram, without Power Folding Mirror for GMC Sierra HD 2012 2500:

• (6.6l) (except 6.6l & 4.3l) (4.3l)
• (except 6.6l) (6.6l)
• 175a
• A x6
• Automatic a/c
• D5 x4
• Driver outside rearview mirror
• G103 g102 g107 (6.6l: on front of right cylinder head) (except 6.6l & 4.3l: on lower left front of engine) (4.3l: top left rear of engine)
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Hot at all times
• Htd mir fuse 53 fuse 51 30a
• Hvac control module
• J105
• J502
• J603
• Logic
• Manual a/c
• N5 x2
• Nca
• Passenger outside rearview mirror
• Power distribution system
• Rear defog relay
• Rear defogger ind
• Rear defogger switch
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (except 6.6l: on positive battery terminal) (6.6l: right side of firewall)
• X202
• X4 a7
• X500
• X600

Rear Defogger Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Rear Defogger Wiring Diagram for GMC Sierra HD 2012 2500:

• (6.6l) (except 6.6l & 4.3l) (4.3l)
• (6.6l: right side of firewall)
• (except 6.6l) (6.6l)
• (except crew cab) (crew cab)
• 175a
• A x1
• A x6
• Automatic a/c
• B5 x4
• B8 x202
• G103 g102 g107 (6.6l: on front of right cylinder head) (except 6.6l & 4.3l: on lower left front of engine) (4.3l: top left rear of engine)
• G304 g307 (except crew cab: on lower right "b" pillar) (crew cab: at right rear corner of passenger compt)
• Hot at all times
• Hvac control module
• J105
• Logic
• Manual a/c
• N5 x2
• Power distribution system
• Rear defog fuse 50 fuse 47 30a
• Rear defog relay
• Rear defogger ind
• Rear defogger switch
• Rear window defogger grid
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (except 6.6l: on positive battery terminal)
• X4 a7

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Electronic Power Steering Wiring Diagram for GMC Sierra HD 2012 2500:

• (in instrument panel harness) j241
• (ipc)
• 42v+
• 42v-
• 5-volt ref
• 5v ref
• 8600 gvw
• A11
• Accessory dc power control module (right rear of engine compt)
• Auxiliary fuse block (left side of engine compt)
• Brake master cylinder piston position sensor (bottom of brake master cylinder)
• Computer data lines system
• Driver information center (dic) display
• Electric power steering (eps) motor
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Electronic power steering motor control module (right rear of engine compt)
• Eps fuse 7 15a
• Equal to 8600
• Except hybrid grater than/
• Except hybrid less than/
• Gnd
• Ground
• Hi spd gmlan
• Hi spd gmlan data bus-
• Hot at all times
• Hybrid
• In shaft cos
• In shaft sin
• Instrument
• Logic
• Low ref
• Mtr phase u
• Mtr phase v
• Mtr phase w
• Nca
• Out shaft cos
• Out shaft sin
• Panel cluster
• Power steering assist motor (lower front of engine compt)
• Power steering dynamic brake circuit
• Power steering motor rotational sensor
• Power steering shaft torque sensor
• Red
• Resolver cos
• Resolver sin
• Ser data bus (+)
• Ser data bus (-)
• Ser data enable
• Steering angle sens phase a
• Steering angle sens phase b
• Steering angle sens phase c
• Steering angle sens signal
• Steering angle sensor (on sterring column)
• Tan
• X115
• X201

ENGINE PERFORMANCE

4.3L VIN X

4.3L VIN X, Engine Performance Wiring Diagram (1 of 4) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (1 of 4) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (top left rear of engine)
• 4wd lo
• 5v ref1
• 5v ref2
• A/c cl ctrl
• A/c press sig
• Acc ser data
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Air conditioning system
• App1 sig
• App2 sig
• Axl sw sig
• Brake padal position sensor
• Brk aply vol sens
• Cfan hi ctrl
• Cfan lo ctrl
• Computer data lines system
• Cooling fans system
• Cooling fans system anti-lock brakes system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Evap vent
• Evaporative emission (evap) canister vent solenoid valve (top left rear of engine)
• Exterior lights system
• Fp rly ctrl
• Front fuel pump & sender assembly (in front fuel tank)
• Ftp sig
• Fuel lvl
• Fuel pmp relay
• Fuel pump fuse 20 25a
• Fuel tank pressure (ftp) sensor (on fuel pump & sender assembly)
• G106 (right rear of engine)
• G107
• G300 (below driver's door, on body mount)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (near left side of engine)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (near right side of engine)
• Ho2s hi b1s2
• Ho2s hi b2s2
• Ho2s ht b1s2
• Ho2s ht b2s2
• Ho2s lo b1s2
• Ho2s lo b2s2
• Hot at all times
• Iat sensor
• Iat sig
• Ig1
• Ign
• J105
• J106
• Lo ref
• Low ref
• Maf
• Maf sig
• Mass air flow (maf)/intake air temperature (iat) sensor (right front of engine)
• Mil ctrl
• Nca
• P/n sig
• Pnk
• Pnk d
• Pwt rly ctrl
• Sens sig
• Signal
• Starting/ charging system
• Strt rly ctrl
• Tan
• Tan a
• Tan b
• Tcc sig
• Tos sig
• Transmissions system
• Underhood fuse block (left side of engine compt)
• Vol sens brk sply
• Vss
• W/ two speed transfer case
• W/o two speed transfer case
• X109
• X131
• X205

4.3L VIN X, Engine Performance Wiring Diagram (2 of 4) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (2 of 4) for GMC Sierra HD 2012 2500:

• Central sequential fuel injection (sfi) module (top rear of engine)
• Ecm- batt fuse 12 10a
• Ecm- ign fuse 56 15a
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• Hot at all times
• Hot w/ run/crnk relay energized
• Inj-a fuse 24 20a
• J128 (in engine harness)
• O2-b snsr fuse 8 10a
• Pnk
• Pnk b
• Pnk d
• Pnk e
• Pnk h
• Pnk j
• Pnk l
• Pwr/ trn relay
• Tan
• Tan f
• Tcm- batt fuse 14 10a
• To o2-a snsr fuse (diagram 3 of 4)
• Underhood fuse block (left side of engine compt)

4.3L VIN X, Engine Performance Wiring Diagram (3 of 4) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (3 of 4) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (upper left corner of dash)
• (w/ steering wheel heater) j220
• Aux hvac- ign fuse 48 1oa
• Brake fluid level switch (on brake master cylinder reservoir)
• Computer data lines system
• Engine oil pressure (eop) sensor (rear of engine)
• Engine oil pressure ind
• From inj-a fuse (diagram 2 of 4)
• G103 (on front of right cylinder head)
• G201
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (near left side of engine)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (near right side of engine)
• Hot at all times
• Hot w/ run/crnk relay energized
• Ic1
• Ic2
• Ic3
• Ign
• Ign 1
• Ignition control module (icm) (rear of engine)
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Lo bus
• Lo ref
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (top rear of engine)
• Nca
• O2-a snsr fuse 18 10a
• Pnk
• Pnk f
• Power distribution system
• Tan
• Throttle body
• Underhood fuse block (left side of engine compt)
• X109

4.3L VIN X, Engine Performance Wiring Diagram (4 of 4) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Engine Performance Wiring Diagram (4 of 4) for GMC Sierra HD 2012 2500:

• 5v ref
• 5v ref1
• 5v ref2
• Camshaft position (cmp) sensor
• Chg ind sig
• Ckp sig
• Cmp sig
• Crankshaft position (ckp) sensor (front of engine, right of crank pulley)
• Ect sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Engine coolant temperature (ect) sensor (left side of engine)
• Evaporative emission (evap) canister purge solenoid valve (top left rear of engine)
• G106 (right rear of engine)
• Gen fdc sig
• Gnd
• Ho2s hi b1s1
• Ho2s hi b2s1
• Ho2s htr b1s1
• Ho2s htr b2s1
• Ho2s lo b1s1
• Ho2s lo b2s1
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• J106
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Ks1 sig
• Ks2 sig
• Lo ref
• Low ref
• Map sig
• Oil press sig
• Pnk
• Red
• Sens sig
• Sig sens
• Sol ctrl
• Starting/ charging system
• Starting/charging system
• Tac mtr ctrl-1
• Tac mtr ctrl-2
• Tan
• Tp1 sig
• Tp2 sig
• X112

4.8L VIN A

4.8L VIN A, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (on fuel pump & sender assembly)
• (or 821)
• 4wd lo sig
• 5v ref 1
• 5v ref1
• 5v ref2
• A/c cl ctrl
• A/c press sig
• Acc ser data
• Air conditioning system
• Anti-lock brakes system
• App1 sig
• App2 sig
• Axl sw sig
• Brake pedal position sensor
• Brk aply volt senr
• Brk sw sig
• Cfan hi ctrl
• Cfan lo ctrl
• Computer data lines system
• Cooling fans system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Evap vent
• Evaporative emission (evap) canister vent solenoid valve (under rear of vehicle)
• Exterior lights system
• Front fuel pump & sender assembly (in front fuel tank)
• Ftp sig
• Fuel ctrl
• Fuel lvl-pri
• Fuel tank pressure (ftp) sensor
• G103 (on front of right cylinder head)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (downstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (downstream of right catalytic converter)
• Ho2s hi b1s2
• Ho2s hi b2s2
• Ho2s ht b1s2
• Ho2s ht b2s2
• Ho2s lo b1s2
• Ho2s lo b2s2
• Iat sig
• Ig1
• J106
• Lo ref
• Low ref
• Maf sig
• Mil ctrl
• Nca
• P/n sig
• Pnk
• Pnk d
• Pwtn rly ctrl
• Snsr sig
• Starting/ charging system
• Strt rly ctrl
• Tan
• Tan a
• Tos sig or vss hi sig
• Transmissions system
• Vol snsr
• Vss
• Vss lo sig
• W/ two speed transfer case
• W/o two speed transfer case
• X109
• X131
• X205

4.8L VIN A, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (or 239)
• 5v ref
• Computer data lines system
• Ecm- ign fuse 56 15a
• Fscm fuse 21 20a
• Fscm shield
• Fuel ctrl
• Fuel line pressure sensor (under left side of vehicle)
• Fuel press
• Fuel pump/ trailer brake control module (w/ integrated trailer brake control) fuel pump flow control module (w/o integrated trailer brake control) (rear frame, near spare tire mount)
• G300 (below driver's door, on body mount)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ig1
• J300
• Lo ref
• Misc ign fuse 43 10a
• Pnk
• Power distribution system
• Pump (+)
• Ser data en
• Tan
• Underhood fuse block (left side of engine compt)
• W/ integrated trailer brake control
• W/o integrated trailer brake control
• X102
• X205

4.8L VIN A, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500:

• (front of engine) (6.2l) camshaft actuator solenoid valve
• (not used)
• 5.3l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Ecm- batt fuse 12 10a
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• G103 (on front of right cylinder head)
• Hot at all times
• Iat
• Inj-a fuse 24 20a
• Inj-b fuse 13 20a
• J106
• Maf
• Mass air flow (maf)/intake air temperature (iat) sensor (right front of engine compt)
• O2-b snsr fuse 8 10a
• Pnk
• Pnk a
• Pnk d
• Pwr/ trn relay
• Tan
• Tan a
• Tan b
• Tcm- batt fuse 14 15a
• To o2-a snsr fuse (diagram 4 of 6)
• Transfer case active push button
• Underhood fuse block (left side of engine compt)
• W/ two speed
• W/o two speed
• X109
• X111
• X112
• X113
• X205

4.8L VIN A, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash)
• (or red)
• (upper left corner of dash) g201
• Aux hvac- ign fuse 48 1oa
• B x112
• Brake fluid level switch (on brake master cylinder reservoir)
• Camshaft position (cmp) sensor (front of engine, above crank pulley)
• Computer data lines system
• Crankshaft position (ckp) sensor (right rear of engine)
• Engine coolant temperature (ect) sensor (on top of engine)
• Engine oil pressure (eop) sensor (top rear of engine)
• Engine oil pressure ind
• From inj-b fuse (diagram 3 of 6)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (upstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (upstream of right catalytic converter)
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J220 (w/ steering wheel heater)
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Left i/p junction block
• Lo bus
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (on top of intake manifold)
• Nca
• O2-a snsr fuse 18 10a
• Pnk
• Power distribution system
• Tan
• Underhood fuse block (left side of engine compt)
• X109

4.8L VIN A, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500:

• (below intake manifold) valve lifter oil manifold (vlom) assembly
• (in ignition coil jumper harness, 5 cm from x111 breakout)
• A x111
• Ckp sig
• E pnk
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G102 (on lower left front of engine)
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Ignition coils (upper left side of engine)
• J107
• J108
• J109
• Lo ref
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Spark plug
• Tan
• X111

4.8L VIN A, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500:

• (in ignition
• 5v ref1
• 5v ref2
• A pnk
• C tan
• Cam sol ctrl
• Chg ind sig
• Cmp sig
• Coil jumper harness, 5 cm from x111 breakout)
• Cyl off ctrl 1
• Cyl off ctrl 2
• Cyl off ctrl 3
• Cyl off ctrl 4
• Ect sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Eop sig
• Evaporative emission (evap) canister purge solenoid valve (on intake manifold)
• G102 (on lower left front of engine)
• Gen fdc sig
• Ho2s hi b1s1
• Ho2s hi b2s1
• Ho2s htr b1s1
• Ho2s htr b2s1
• Ho2s lo b1s1
• Ho2s lo b2s1
• Ignition coils (upper right side of engine)
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• J110
• J111
• J112
• Ks1 sig
• Ks2 sig
• Lo ref
• Map sig
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Sol ctrl
• Spark plug
• Starting/ charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Throttle body
• Tp sens1 sig
• Tp sens2 sig
• X113

5.3L VIN 0

5.3L VIN 0, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (on fuel pump & sender assembly)
• (or 821)
• 4wd lo sig
• 5v ref 1
• 5v ref1
• 5v ref2
• A/c cl ctrl
• A/c press sig
• Acc ser data
• Air conditioning system
• Anti-lock brakes system
• App1 sig
• App2 sig
• Axl sw sig
• Brake pedal position sensor
• Brk aply volt senr
• Brk sw sig
• Cfan hi ctrl
• Cfan lo ctrl
• Computer data lines system
• Cooling fans system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Evap vent
• Evaporative emission (evap) canister vent solenoid valve (under rear of vehicle)
• Exterior lights system
• Front fuel pump & sender assembly (in front fuel tank)
• Ftp sig
• Fuel ctrl
• Fuel lvl-pri
• Fuel tank pressure (ftp) sensor
• G103 (on front of right cylinder head)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (downstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (downstream of right catalytic converter)
• Ho2s hi b1s2
• Ho2s hi b2s2
• Ho2s ht b1s2
• Ho2s ht b2s2
• Ho2s lo b1s2
• Ho2s lo b2s2
• Iat sig
• Ig1
• J106
• Lo ref
• Low ref
• Maf sig
• Mil ctrl
• Nca
• P/n sig
• Pnk
• Pnk d
• Pwtn rly ctrl
• Snsr sig
• Starting/ charging system
• Strt rly ctrl
• Tan
• Tan a
• Tos sig or vss hi sig
• Transmissions system
• Vol snsr
• Vss
• Vss lo sig
• W/ two speed transfer case
• W/o two speed transfer case
• X109
• X131
• X205

5.3L VIN 0, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (or 239)
• 5v ref
• Computer data lines system
• Ecm- ign fuse 56 15a
• Fscm fuse 21 20a
• Fscm shield
• Fuel ctrl
• Fuel line pressure sensor (under left side of vehicle)
• Fuel press
• Fuel pump/ trailer brake control module (w/ integrated trailer brake control) fuel pump flow control module (w/o integrated trailer brake control) (rear frame, near spare tire mount)
• G300 (below driver's door, on body mount)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ig1
• J300
• Lo ref
• Misc ign fuse 43 10a
• Pnk
• Power distribution system
• Pump (+)
• Ser data en
• Tan
• Underhood fuse block (left side of engine compt)
• W/ integrated trailer brake control
• W/o integrated trailer brake control
• X102
• X205

5.3L VIN 0, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500:

• (front of engine) (6.2l) camshaft actuator solenoid valve
• (not used)
• 5.3l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Ecm- batt fuse 12 10a
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• G103 (on front of right cylinder head)
• Hot at all times
• Iat
• Inj-a fuse 24 20a
• Inj-b fuse 13 20a
• J106
• Maf
• Mass air flow (maf)/intake air temperature (iat) sensor (right front of engine compt)
• O2-b snsr fuse 8 10a
• Pnk
• Pnk a
• Pnk d
• Pwr/ trn relay
• Tan
• Tan a
• Tan b
• Tcm- batt fuse 14 15a
• To o2-a snsr fuse (diagram 4 of 6)
• Transfer case active push button
• Underhood fuse block (left side of engine compt)
• W/ two speed
• W/o two speed
• X109
• X111
• X112
• X113
• X205

5.3L VIN 0, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash)
• (or red)
• (upper left corner of dash) g201
• Aux hvac- ign fuse 48 1oa
• B x112
• Brake fluid level switch (on brake master cylinder reservoir)
• Camshaft position (cmp) sensor (front of engine, above crank pulley)
• Computer data lines system
• Crankshaft position (ckp) sensor (right rear of engine)
• Engine coolant temperature (ect) sensor (on top of engine)
• Engine oil pressure (eop) sensor (top rear of engine)
• Engine oil pressure ind
• From inj-b fuse (diagram 3 of 6)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (upstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (upstream of right catalytic converter)
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J220 (w/ steering wheel heater)
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Left i/p junction block
• Lo bus
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (on top of intake manifold)
• Nca
• O2-a snsr fuse 18 10a
• Pnk
• Power distribution system
• Tan
• Underhood fuse block (left side of engine compt)
• X109

5.3L VIN 0, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500:

• (below intake manifold) valve lifter oil manifold (vlom) assembly
• (in ignition coil jumper harness, 5 cm from x111 breakout)
• A x111
• Ckp sig
• E pnk
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G102 (on lower left front of engine)
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Ignition coils (upper left side of engine)
• J107
• J108
• J109
• Lo ref
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Spark plug
• Tan
• X111

5.3L VIN 0, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500:

• (in ignition
• 5v ref1
• 5v ref2
• A pnk
• C tan
• Cam sol ctrl
• Chg ind sig
• Cmp sig
• Coil jumper harness, 5 cm from x111 breakout)
• Cyl off ctrl 1
• Cyl off ctrl 2
• Cyl off ctrl 3
• Cyl off ctrl 4
• Ect sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Eop sig
• Evaporative emission (evap) canister purge solenoid valve (on intake manifold)
• G102 (on lower left front of engine)
• Gen fdc sig
• Ho2s hi b1s1
• Ho2s hi b2s1
• Ho2s htr b1s1
• Ho2s htr b2s1
• Ho2s lo b1s1
• Ho2s lo b2s1
• Ignition coils (upper right side of engine)
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• J110
• J111
• J112
• Ks1 sig
• Ks2 sig
• Lo ref
• Map sig
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Sol ctrl
• Spark plug
• Starting/ charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Throttle body
• Tp sens1 sig
• Tp sens2 sig
• X113

5.3L VIN 7

5.3L VIN 7, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (on fuel pump & sender assembly)
• (or 821)
• 4wd lo sig
• 5v ref 1
• 5v ref1
• 5v ref2
• A/c cl ctrl
• A/c press sig
• Acc ser data
• Air conditioning system
• Anti-lock brakes system
• App1 sig
• App2 sig
• Axl sw sig
• Brake pedal position sensor
• Brk aply volt senr
• Brk sw sig
• Cfan hi ctrl
• Cfan lo ctrl
• Computer data lines system
• Cooling fans system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Evap vent
• Evaporative emission (evap) canister vent solenoid valve (under rear of vehicle)
• Exterior lights system
• Front fuel pump & sender assembly (in front fuel tank)
• Ftp sig
• Fuel ctrl
• Fuel lvl-pri
• Fuel tank pressure (ftp) sensor
• G103 (on front of right cylinder head)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (downstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (downstream of right catalytic converter)
• Ho2s hi b1s2
• Ho2s hi b2s2
• Ho2s ht b1s2
• Ho2s ht b2s2
• Ho2s lo b1s2
• Ho2s lo b2s2
• Iat sig
• Ig1
• J106
• Lo ref
• Low ref
• Maf sig
• Mil ctrl
• Nca
• P/n sig
• Pnk
• Pnk d
• Pwtn rly ctrl
• Snsr sig
• Starting/ charging system
• Strt rly ctrl
• Tan
• Tan a
• Tos sig or vss hi sig
• Transmissions system
• Vol snsr
• Vss
• Vss lo sig
• W/ two speed transfer case
• W/o two speed transfer case
• X109
• X131
• X205

5.3L VIN 7, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (or 239)
• 5v ref
• Computer data lines system
• Ecm- ign fuse 56 15a
• Fscm fuse 21 20a
• Fscm shield
• Fuel ctrl
• Fuel line pressure sensor (under left side of vehicle)
• Fuel press
• Fuel pump/ trailer brake control module (w/ integrated trailer brake control) fuel pump flow control module (w/o integrated trailer brake control) (rear frame, near spare tire mount)
• G300 (below driver's door, on body mount)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ig1
• J300
• Lo ref
• Misc ign fuse 43 10a
• Pnk
• Power distribution system
• Pump (+)
• Ser data en
• Tan
• Underhood fuse block (left side of engine compt)
• W/ integrated trailer brake control
• W/o integrated trailer brake control
• X102
• X205

5.3L VIN 7, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500:

• (front of engine) (6.2l) camshaft actuator solenoid valve
• (not used)
• 5.3l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Ecm- batt fuse 12 10a
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• G103 (on front of right cylinder head)
• Hot at all times
• Iat
• Inj-a fuse 24 20a
• Inj-b fuse 13 20a
• J106
• Maf
• Mass air flow (maf)/intake air temperature (iat) sensor (right front of engine compt)
• O2-b snsr fuse 8 10a
• Pnk
• Pnk a
• Pnk d
• Pwr/ trn relay
• Tan
• Tan a
• Tan b
• Tcm- batt fuse 14 15a
• To o2-a snsr fuse (diagram 4 of 6)
• Transfer case active push button
• Underhood fuse block (left side of engine compt)
• W/ two speed
• W/o two speed
• X109
• X111
• X112
• X113
• X205

5.3L VIN 7, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash)
• (or red)
• (upper left corner of dash) g201
• Aux hvac- ign fuse 48 1oa
• B x112
• Brake fluid level switch (on brake master cylinder reservoir)
• Camshaft position (cmp) sensor (front of engine, above crank pulley)
• Computer data lines system
• Crankshaft position (ckp) sensor (right rear of engine)
• Engine coolant temperature (ect) sensor (on top of engine)
• Engine oil pressure (eop) sensor (top rear of engine)
• Engine oil pressure ind
• From inj-b fuse (diagram 3 of 6)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (upstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (upstream of right catalytic converter)
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J220 (w/ steering wheel heater)
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Left i/p junction block
• Lo bus
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (on top of intake manifold)
• Nca
• O2-a snsr fuse 18 10a
• Pnk
• Power distribution system
• Tan
• Underhood fuse block (left side of engine compt)
• X109

5.3L VIN 7, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500:

• (below intake manifold) valve lifter oil manifold (vlom) assembly
• (in ignition coil jumper harness, 5 cm from x111 breakout)
• A x111
• Ckp sig
• E pnk
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G102 (on lower left front of engine)
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Ignition coils (upper left side of engine)
• J107
• J108
• J109
• Lo ref
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Spark plug
• Tan
• X111

5.3L VIN 7, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500:

• (in ignition
• 5v ref1
• 5v ref2
• A pnk
• C tan
• Cam sol ctrl
• Chg ind sig
• Cmp sig
• Coil jumper harness, 5 cm from x111 breakout)
• Cyl off ctrl 1
• Cyl off ctrl 2
• Cyl off ctrl 3
• Cyl off ctrl 4
• Ect sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Eop sig
• Evaporative emission (evap) canister purge solenoid valve (on intake manifold)
• G102 (on lower left front of engine)
• Gen fdc sig
• Ho2s hi b1s1
• Ho2s hi b2s1
• Ho2s htr b1s1
• Ho2s htr b2s1
• Ho2s lo b1s1
• Ho2s lo b2s1
• Ignition coils (upper right side of engine)
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• J110
• J111
• J112
• Ks1 sig
• Ks2 sig
• Lo ref
• Map sig
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Sol ctrl
• Spark plug
• Starting/ charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Throttle body
• Tp sens1 sig
• Tp sens2 sig
• X113

6.0L VIN J

6.0L VIN J, Engine Controls Wiring Diagram (1 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Engine Controls Wiring Diagram (1 of 5) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction box
• 5v ref
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Ajar sw sig
• Anti-theft system
• B+ volt
• Bank 1 sens 1
• Bank 1 sens 2
• Camshaft position actuator solenoid valve (front of engine)
• Computer data lines system
• Cooling fans system
• Data
• Ecm-batt fuse 12 10a
• Ecm-ign fuse 56 15a
• Engine control module (ecm) (left front of engine compt)
• Engine oil pressure ind
• Evaporative emission (evap) canister vent solenoid valve (under rear of vehicle)
• Exterior lights system
• Fan rly ctrl
• Fscm fuse 21 25a
• Fuel pressure sensor
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (upstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (downstream of left catalytic converter)
• Hood sw sig
• Hot at all times
• Hot w/ run/ crank relay energized
• Hot w/ run/crank relay energized
• Ign
• Ign coil 1 ctrl
• Ign volt
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J301
• Knock sens sig
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Level sens sig
• Logic
• Low ref
• Mil ctrl
• Mil ind
• Misc ign fuse 43 10a
• Nca
• Pedal sw sig
• Phasor ctrl
• Pnk
• Power distribution system
• Press sens sig
• Pump ctrl mod sig
• Rly coil ctrl
• Sens 1 sig
• Sens 2 sig
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Tcm-batt fuse 14 10a
• Underhood fuse block (left side of engine compt)
• Vent sol ctrl
• W/ integrated trailer brake control
• W/o integrated trailer brake control
• Wake-up sig
• X102
• X109
• X112
• X205
• X300

6.0L VIN J, Engine Controls Wiring Diagram (2 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Engine Controls Wiring Diagram (2 of 5) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (in front fuel tank) front fuel pump & sender assembly
• (in ignition coil jumper harness, 5 cm from x111 breakout) j109
• (in ignition coil jumper harness, 5 cm from x111 breakout) j112
• (rear frame, near spare tire mount) (w/ integrated trailer brake control) fuel pump/trailer brake control module (w/o integrated trailer brake control) fuel pump flow control module
• (upper left side of engine)
• (upper right side of engine)
• Computer data lines system
• Data bus +
• Data bus -
• Extension shield
• Fuel tank pressure (ftp) sensor (on fuel pump & sender assembly)
• G102 (on lower left front of engine)
• G300 (below driver's door, on body mount)
• Gnd
• Ign volt
• Ignition coil 1
• Ignition coil 2
• Ignition coil 3
• Ignition coil 4
• Ignition coil 5
• Ignition coil 6
• Ignition coil 7
• Ignition coil 8 (upper right side of engine)
• J107
• J108
• J110
• J111
• J300
• J423 (in chassis harness)
• Lines system computer data
• Low ref
• Nca
• Pnk
• Pump ctrl
• Red
• Ref volt
• Relay ctrl
• Sens sig
• Serial data
• Spark plug
• Tan
• X111
• X113
• X300

6.0L VIN J, Engine Controls Wiring Diagram (3 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Engine Controls Wiring Diagram (3 of 5) for GMC Sierra HD 2012 2500:

• 5v ref
• 5v ref 2
• Bank 1 sens 1
• Bank 2 sens 1
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Engine control module (ecm) (left front of engine compt)
• G103 (on front of right cylinder head)
• Gnd
• Hot at all times
• Iat sens sig
• Ign coil 2 ctrl
• Ign coil 3 ctrl
• Ign coil 4 ctrl
• Ign coil 5 ctrl
• Ign coil 6 ctrl
• Ign coil 7 ctrl
• Ign coil 8 ctrl
• Ign volt
• Inj-a fuse 24 20a
• Inj-b fuse 13 20a
• Injector 1 ctrl
• Injector 2 ctrl
• Injector 3 ctrl
• Injector 4 ctrl
• Injector 5 ctrl
• Injector 6 ctrl
• Injector 7 ctrl
• Injector 8 ctrl
• J122
• Low ref
• Maf sens sig
• O2-a snsr fuse 18 10a
• O2-b snsr fuse 8 10a
• Pnk
• Pos sens sig
• Press sens sig
• Pwr/ trn relay
• Sens 1 sig
• Sens 2 sig
• Tan
• Underhood fuse block (left side of engine compt)

6.0L VIN J, Engine Controls Wiring Diagram (4 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Engine Controls Wiring Diagram (4 of 5) for GMC Sierra HD 2012 2500:

• (in engine harness, approximately 14 cm from engine coolant temperature sensor breakout)
• (in engine harness, approximately 20 cm from engine coolant temperature sensor breakout) j120
• (right rear of engine) crankshaft position (ckp) sensor
• (top rear of engine) engine oil pressure (eop) sensor
• Camshaft position (cmp) sensor (front of engine, above crank pulley)
• Drive motor generator power inverter module (right rear of engine compt)
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• G103 (on front of right cylinder head)
• Iat
• J106
• J121
• Low ref
• Maf
• Mass air flow (maf)/intake air temperature (iat) sensor (on air intake duct)
• Pnk
• Pos sens sig
• Tan
• Throttle body
• X112

6.0L VIN J, Engine Controls Wiring Diagram (5 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Engine Controls Wiring Diagram (5 of 5) for GMC Sierra HD 2012 2500:

• (downstream of right catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2
• (on front of right cylinder head) g103
• (on intake manifold) evaporative emission (evap) canister purge solenoid valve
• (or 821)
• (upstream of right catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 1
• 1 shutoff sol
• 4 shutoff sol
• 5v ref
• 6 shutoff sol
• 7 shutoff sol
• A tan
• Air conditioning system
• Bank 2 sens 1
• Bank 2 sens 2
• Barometric pressure (baro) sensor
• Computer data lines system
• Cooling fans system
• D pnk
• Data bus +
• Data bus -
• Ect sens sig
• Engine control module (ecm) (left front of engine compt)
• Engine coolant temperature (ect) sensor (on top of engine)
• Fan rly ctrl
• Gnd
• J122
• Low ref
• Manifold absolute pressure (map) sensor (on top of intake manifold)
• Map sens sig
• Nca
• Pnk
• Press sens sig
• Pt lan +
• Pt lan -
• Pump mtr gnd
• Purge sol ctrl
• Tan
• Transmissions system
• Valve lifter oil manifold (vlom) assembly (below intake manifold)
• Vss sig (or) vss high sig vss low sig

6.0L VIN J, Hybrid System Wiring Diagram (1 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid System Wiring Diagram (1 of 5) for GMC Sierra HD 2012 2500:

• (w/ generator assembly)
• 1st position drive motor
• 2nd position drive motor
• Automatic transmission
• Automatic transmission auxiliary fluid pump control module (left side of drain wire nca
• Automatic transmission internal mode switch (ims)
• Auxiliary fuse block (left side of engine compt)
• B+ nca
• Circuit 1
• Circuit 2
• Circuit excitation
• Computer data lines system
• Cont ctrl
• Drive motor generator power inverter module (right rear of engine compt)
• Engine compt)
• Engine controls circuit
• Excitation circuit
• Fluid pump
• Fluid pump nca
• G103 (on front of right cylinder head)
• Gnd nca
• High voltage
• Hot at all times
• Ign nca
• Ign volt
• Inter mode gnd
• Inter mode r1
• Inter mode r2
• Inter mode r3
• Inter mode r4
• Inter mode s
• J146
• J147
• Low reference
• Mega fuse 200a
• Mtr a s1 sig
• Mtr a s2 sig
• Mtr a s3 sig
• Mtr a s4 sig
• Mtr b s1 sig
• Mtr b s2 sig
• Mtr b s3 sig
• Mtr b s4 sig
• Nca
• Phase a nca
• Phase b nca
• Phase c nca
• Pim 1 fuse 8 15a
• Pim 2 fuse 9 15a
• Pos sens sig
• Pt lan+
• Pt lan-
• Pump ctrl
• Pump ctrl nca
• Red
• Resol mtr a+
• Resol mtr b+
• Resol mtr b-
• Sens b rtn
• Ser data bus+
• Ser data bus-
• Tan
• Temp sens a
• Temp sens b
• Trans pump fuse 60a
• Transmissions system
• Wake up sig
• X176

6.0L VIN J, Hybrid System Wiring Diagram (2 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid System Wiring Diagram (2 of 5) for GMC Sierra HD 2012 2500:

• (w/ two speed active transfer case)
• 300v+
• 300v-
• 42v+
• 42v-
• A/c compressor
• Accessory dc power control module (right rear of engine compt)
• Automatic transmission auxiliary fluid pump (under front of automatic transmission)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Drive motor generator power inverter module (right rear of engine compt)
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Electronic power steering motor control module (right rear of engine compt)
• G112
• Gnd
• Hot w/ run/crnk relay energized
• Ign volt
• J123
• Nca
• Phase u
• Phase v
• Phase w
• Power distribution system
• Pt lan+
• Pt lan-
• Red
• Shield
• Shld
• Trans ign 1 fuse 19 15a
• Underhood fuse block (left side of engine compt)
• Up sig
• X10
• X11
• X12
• X300

6.0L VIN J, Hybrid System Wiring Diagram (3 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid System Wiring Diagram (3 of 5) for GMC Sierra HD 2012 2500:

• Auxiliary fuse block (left side of engine compt)
• Battery module
• Becm fuse 10 15a
• Drive motor generator battery (under second row seats)
• Drive motor generator battery control module
• Drive motor generator power inverter module cover
• Gnd
• Hot at all times
• Monitor 1
• Monitor 10
• Monitor 11
• Monitor 12
• Monitor 13
• Monitor 14
• Monitor 15
• Monitor 16
• Monitor 17
• Monitor 18
• Monitor 19
• Monitor 2
• Monitor 20
• Monitor 3
• Monitor 4
• Monitor 5
• Monitor 6
• Monitor 7
• Monitor 8
• Monitor 9
• Pnk
• Power distribution system
• Red
• To drive motor battery high voltage manual disconnect lever (diagram 4 of 5)
• To drive motor battery positive high voltage contactor relay (diagram 4 of 5)
• Transmission power inverter module (3 phase) cable cover
• X150
• X215

6.0L VIN J, Hybrid System Wiring Diagram (4 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid System Wiring Diagram (4 of 5) for GMC Sierra HD 2012 2500:

• (under second row seats) drive motor generator battery
• 5-volt ref
• Computer data lines system
• Ctrl sig
• Data bus +
• Data bus -
• Drive motor battery cable terminal extension cover
• Drive motor battery current sensor
• Drive motor battery high voltage manual disconnect lever
• Drive motor battery inverter current limit resistor
• Drive motor battery positive high voltage contactor relay
• Drive motor generator battery control module
• Drive motor power inverter current limit relay
• From battery module (diagram 3 of 5)
• Fuse 125a
• G302 (below right side of passenger's seat)
• G311
• G312
• Gnd
• High voltage
• J302
• Nca
• Pnk
• Red
• Relay ctrl
• Ser data com
• Tan
• To drive motor generator battery control module (diagram 5 of 5)
• To generator battery vent fan (diagram 5 of 5)
• To generator battery vent fan relay (diagram 5 of 5)
• Wake up sig
• X350

6.0L VIN J, Hybrid System Wiring Diagram (5 of 5) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Hybrid System Wiring Diagram (5 of 5) for GMC Sierra HD 2012 2500:

• (on lower left radiator support) g100
• 5-volt ref
• Air inlet drive motor battery temperature sensor
• Air outlet drive motor battery temperature sensor
• Auxiliary fuse block (left side of engine compt)
• Becm fan fuse 2 15a
• Computer data lines system
• Cool pump fuse 6 15a
• Cool pump relay
• Drive motor battery temperature sensor 1
• Drive motor battery temperature sensor 2
• Drive motor battery temperature sensor 3
• Drive motor battery temperature sensor 4
• Drive motor generator battery (under second row seats)
• Drive motor generator battery control module (under second row seats)
• Engine control module (ecm) (left front of engine compt)
• From drive motor battery current sensor (diagram 4 of 5)
• From drive motor generator battery control module (diagram 4 of 5)
• G101 (on lower right radiator support)
• G311
• Generator battery vent fan
• Generator battery vent fan relay
• Generator control module temperature sensor
• Ground
• Hot at all times
• J100
• J101
• J119
• J395
• Left generator control module coolant pump
• Low ref
• Mtr pwr feed
• Not used
• Pt lan+
• Pt lan-
• Pump mtr gnd
• Red
• Right generator control module coolant pump
• Sens 1 rtn
• Sens 1 sig
• Sens 2 rtn
• Sens 2 sig
• Sens 3 rtn
• Sens 3 sig
• Sens 4 rtn
• Sens 4 sig
• Sens ref
• Sens rtn
• Sens sig
• Tan
• X120 d
• X150 c8
• X215 j
• X350

6.2L VIN 2

6.2L VIN 2, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500:

• (in chassis harness) j331
• (on fuel pump & sender assembly)
• (or 821)
• 4wd lo sig
• 5v ref 1
• 5v ref1
• 5v ref2
• A/c cl ctrl
• A/c press sig
• Acc ser data
• Air conditioning system
• Anti-lock brakes system
• App1 sig
• App2 sig
• Axl sw sig
• Brake pedal position sensor
• Brk aply volt senr
• Brk sw sig
• Cfan hi ctrl
• Cfan lo ctrl
• Computer data lines system
• Cooling fans system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Evap vent
• Evaporative emission (evap) canister vent solenoid valve (under rear of vehicle)
• Exterior lights system
• Front fuel pump & sender assembly (in front fuel tank)
• Ftp sig
• Fuel ctrl
• Fuel lvl-pri
• Fuel tank pressure (ftp) sensor
• G103 (on front of right cylinder head)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (downstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (downstream of right catalytic converter)
• Ho2s hi b1s2
• Ho2s hi b2s2
• Ho2s ht b1s2
• Ho2s ht b2s2
• Ho2s lo b1s2
• Ho2s lo b2s2
• Iat sig
• Ig1
• J106
• Lo ref
• Low ref
• Maf sig
• Mil ctrl
• Nca
• P/n sig
• Pnk
• Pnk d
• Pwtn rly ctrl
• Snsr sig
• Starting/ charging system
• Strt rly ctrl
• Tan
• Tan a
• Tos sig or vss hi sig
• Transmissions system
• Vol snsr
• Vss
• Vss lo sig
• W/ two speed transfer case
• W/o two speed transfer case
• X109
• X131
• X205

6.2L VIN 2, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (or 239)
• 5v ref
• Computer data lines system
• Ecm- ign fuse 56 15a
• Fscm fuse 21 20a
• Fscm shield
• Fuel ctrl
• Fuel line pressure sensor (under left side of vehicle)
• Fuel press
• Fuel pump/ trailer brake control module (w/ integrated trailer brake control) fuel pump flow control module (w/o integrated trailer brake control) (rear frame, near spare tire mount)
• G300 (below driver's door, on body mount)
• Gmlan (+)
• Gmlan (-)
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ig1
• J300
• Lo ref
• Misc ign fuse 43 10a
• Pnk
• Power distribution system
• Pump (+)
• Ser data en
• Tan
• Underhood fuse block (left side of engine compt)
• W/ integrated trailer brake control
• W/o integrated trailer brake control
• X102
• X205

6.2L VIN 2, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500:

• (front of engine) (6.2l) camshaft actuator solenoid valve
• (not used)
• 5.3l
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Ecm- batt fuse 12 10a
• Ecm/throt cont fuse 5 15a
• Eng fuse 4 15a
• Fuel injectors (top of left cylinder bank)
• Fuel injectors (top of right cylinder bank)
• G103 (on front of right cylinder head)
• Hot at all times
• Iat
• Inj-a fuse 24 20a
• Inj-b fuse 13 20a
• J106
• Maf
• Mass air flow (maf)/intake air temperature (iat) sensor (right front of engine compt)
• O2-b snsr fuse 8 10a
• Pnk
• Pnk a
• Pnk d
• Pwr/ trn relay
• Tan
• Tan a
• Tan b
• Tcm- batt fuse 14 15a
• To o2-a snsr fuse (diagram 4 of 6)
• Transfer case active push button
• Underhood fuse block (left side of engine compt)
• W/ two speed
• W/o two speed
• X109
• X111
• X112
• X113
• X205

6.2L VIN 2, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500:

• (lower left side of dash)
• (or red)
• (upper left corner of dash) g201
• Aux hvac- ign fuse 48 1oa
• B x112
• Brake fluid level switch (on brake master cylinder reservoir)
• Camshaft position (cmp) sensor (front of engine, above crank pulley)
• Computer data lines system
• Crankshaft position (ckp) sensor (right rear of engine)
• Engine coolant temperature (ect) sensor (on top of engine)
• Engine oil pressure (eop) sensor (top rear of engine)
• Engine oil pressure ind
• From inj-b fuse (diagram 3 of 6)
• Gnd
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (upstream of left catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (upstream of right catalytic converter)
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• J220 (w/ steering wheel heater)
• Knock sensor (ks) 1 (lower left side of engine)
• Knock sensor (ks) 2 (lower right side of engine)
• Left i/p junction block
• Lo bus
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (on top of intake manifold)
• Nca
• O2-a snsr fuse 18 10a
• Pnk
• Power distribution system
• Tan
• Underhood fuse block (left side of engine compt)
• X109

6.2L VIN 2, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500:

• (below intake manifold) valve lifter oil manifold (vlom) assembly
• (in ignition coil jumper harness, 5 cm from x111 breakout)
• A x111
• Ckp sig
• E pnk
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• G102 (on lower left front of engine)
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Ignition coils (upper left side of engine)
• J107
• J108
• J109
• Lo ref
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Spark plug
• Tan
• X111

6.2L VIN 2, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Engine Performance Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500:

• (in ignition
• 5v ref1
• 5v ref2
• A pnk
• C tan
• Cam sol ctrl
• Chg ind sig
• Cmp sig
• Coil jumper harness, 5 cm from x111 breakout)
• Cyl off ctrl 1
• Cyl off ctrl 2
• Cyl off ctrl 3
• Cyl off ctrl 4
• Ect sig
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Eop sig
• Evaporative emission (evap) canister purge solenoid valve (on intake manifold)
• G102 (on lower left front of engine)
• Gen fdc sig
• Ho2s hi b1s1
• Ho2s hi b2s1
• Ho2s htr b1s1
• Ho2s htr b2s1
• Ho2s lo b1s1
• Ho2s lo b2s1
• Ignition coils (upper right side of engine)
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• J110
• J111
• J112
• Ks1 sig
• Ks2 sig
• Lo ref
• Map sig
• Nca
• Pnk
• Pnk d
• Red
• Red c
• Sol ctrl
• Spark plug
• Starting/ charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Throttle body
• Tp sens1 sig
• Tp sens2 sig
• X113

EXTERIOR LIGHTS

Backup Lamps Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Backup Lamps Wiring Diagram for GMC Sierra HD 2012 2500:

• (6.6l)
• (below driver's door, on body mount) g300
• (diesel: right side of firewall)
• (except 6.6l)
• (if equipped) backup alarm
• (in camper harness, 109.5 cm from x414 breakout) j415
• (on front of right cylinder head) (except 4.3l) g103 g106 (4.3l) (right rear of engine)
• (on lower left front of engine) (except 4.3l & 6.6l) g102
• 175a
• Automatic transmission (6.0l hybrid)
• Automatic transmission (6.6l)
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Bck/up lamp pcb relay
• Bck/up rly
• Bck/up sig
• Body control module (bcm) (lower left side of dash)
• Camera
• Computer data lines system
• Control solenoid valve assembly
• Data bus+
• Data bus-
• Decor level 3 convenience package
• G103 (6.6l) (on front of right cylinder head)
• G107 (4.3l) (top left rear of engine)
• G401 (on left rear body mount)
• Gmlan serial hi spd
• Gnd
• Grd
• High speed bus (+)
• High speed bus (-)
• High speed gmlan serial data bus+
• High speed gmlan serial data bus-
• Hot at all times
• If equipped
• Inside rearview mirror (isrvm)
• J105
• J106
• J410
• Left backup lamp
• Left i/p junction block (lower left side of dash)
• Low speed serial data
• Mjr
• Nca
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pnk
• Power distribution system
• Rear lamps junction block (inside of left rear frame rail)
• Rear view camera image display module (if equipped) (in chassis harness, center rear of vehicle)
• Rearview camera (left of tailgate handle)
• Red
• Right backup lamp
• Sw sig 4
• Sw sig a
• Sw sig b
• Sw sig c
• Tan
• Trailer tow circuit
• Trans range sig a
• Trans range sig b
• Trans range sig c
• Transmission control module (4.3l & 4.8l) (left front of engine compt, near fan shroud)
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission range switch signal a
• Transmission range switch signal b
• Transmission range switch signal c
• Trlr bck/up fuse 10 fuse 9 10a
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (gasoline: on positive battery terminal)
• Veh bck/up fuse 15 fuse 14 10a
• W/ comfort &
• W/ rearview camera
• W/ spo rearview
• X10
• X11
• X175
• X175 g
• X209
• X414

Exterior Lamps Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Exterior Lamps Wiring Diagram (1 of 3) for GMC Sierra HD 2012 2500:

• (in right end of dash) right i/p junction block
• (on right front corner of hvac module) g200
• (upper left corner of dash) g201
• 3a4
• 4.3l
• 4.8l (vin a) 6.2l (vin 2) 5.3l (vin 7) 5.3l (vin 0)
• 5v ref
• 6.0l (vin g)
• 6.6l (vin l) & 6.6l (vin 8)
• Auto
• Body control module (bcm) (lower left side of dash)
• Bpp sens sig
• Brake pedal position (bpp) sensor
• Brk sply sig
• Chevrolet
• Computer data lines system
• Data serial b+
• Driver door lock/window switch
• Driver outside rearview mirror
• Electronic shift control transfer case
• Engine control module (left front of engine compt)
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G201 (upper left corner of dash)
• Gmc
• Ground distribution system
• Hazard switch
• Head
• Headlamp & panel dimmer switch
• Hot at all times
• Hz sw
• Hz sw l trn
• Hz sw r trn
• I/p fuse block (left side of dash)
• Instrument panel cluster (ipc)
• J201
• J230
• J502
• J603
• Left turn
• Left turn ind
• Logic
• Low ref
• Lt stop trn fuse 6 15a
• Maj
• Min
• Nca
• Off
• Park
• Park lp sig
• Passenger door lock/window switch
• Passenger outside rearview mirror
• Rf trn sig
• Right front side marker lamp
• Right lower park/ turn signal lamp
• Right turn
• Right turn ind
• Right upper park/ turn signal lamp
• Rly ctrl
• Rt stop trn fuse 8 15a
• Sply volt
• Tan
• Turn signal/ multi-function switch (on left side of steering column)
• Underhood fuse block (left side of engine compt)
• W/ manual folding
• W/ power folding
• W/ power mirrors
• W/ two speed push button &
• W/o power mirrors
• W/o two speed push button &
• X106
• X107
• X109
• X205

Exterior Lamps Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Exterior Lamps Wiring Diagram (2 of 3) for GMC Sierra HD 2012 2500:

• (4.3l) (top left rear of engine)
• (not used)
• (on lower left front of engine) (except 4.3l & 6.6l) g102
• (on right front corner of hvac module) g200
• 6.6l
• Center high mounted stop lamp x1 (chmsl)
• Chevrolet
• Chmsl fuse 49 fuse 46 15a
• Chmsl pcb relay
• Electronic brake control module (ebcm) (on left side of frame assembly)
• Engine control module (left front of engine compt)
• Except 6.6l
• Except hybrid
• G100 (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• G107 g103 (6.6l) (on front of right cylinder head)
• Gmc
• Ground distribution system
• Hot at all times
• Hybrid
• Interior lights system
• Ipc fuse 46 fuse 43 10a
• J102
• J105
• J124 (in engine harness, approximately 7.5 cm from x109)
• J328
• Left front side marker lamp
• Left i/p junction block (lower x9 left side of dash)
• Left lower park/ turn signal lamp
• Left upper park/ turn signal lamp
• Lt prk fuse 26 fuse 23 15a
• Maj
• Min
• Park lamp relay
• Power distribution system
• Power take off module (pto) (if equipped) (outside of right front chassis frame)
• Rt prk fuse 27 fuse 24 15a
• Trailer brake control module (if equipped) (left rear frame rail)
• Trailer tow circuit
• Trlr prk fuse 25 fuse 22 15a
• Underhood fuse block (left side of engine compt)
• W/ odometer security
• X100
• X102
• X205
• X300
• X318

Exterior Lamps Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Exterior Lamps Wiring Diagram (3 of 3) for GMC Sierra HD 2012 2500:

• (diesel: right side of firewall)
• (inside of left rear frame rail) rear lamps junction block
• 175a
• 2b2
• A47
• Breakout) j418
• Breakout) j419
• Chevrolet
• Front middle roof clearance lamp
• G200 (on right front corner of hvac module)
• G300 (below driver's door, on body mount)
• G401 (on left rear body mount)
• Gmc
• Grd
• Hot at all times
• If equipped
• J334
• J337
• J411 (w/ trailer brake)
• J412
• Left backup lamp
• Left front outer roof clearance lamp
• Left front rear fender clearance lamp
• Left license lamp
• Left lower tail/ stop & turn signal lamp
• Left rear most fender clearance lamp
• Left rear side marker lamp
• Left upper tail/ stop & turn signal lamp
• Lower tail/ stop & turn signal lamp
• Mjr
• Mnr
• Nca
• Power distribution system
• Rear lamps junction block (inside of left rear frame rail)
• Rear lamps junction block (inside of left rear frame rail) x1
• Right
• Right backup lamp
• Right front outer roof clearance lamp
• Right front rear fender clearance lamp
• Right i/p junction block (in right end of dash)
• Right license lamp
• Right rear most fender clearance lamp
• Right rear side marker lamp
• Right upper tail/ stop & turn signal lamp
• Tailgate marker lamp
• Underhood fuse holder (gasoline: on positive battery terminal)
• W/ odometer security
• W/ rear dual wheel
• W/ rerar dual wheel
• X415
• X416
• X416 b

Trailer Tow Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Trailer Tow Wiring Diagram for GMC Sierra HD 2012 2500:

• (in camper harness, 109.5 cm from x414 breakout) j415
• (in chassis harness) j422
• 6.6l
• Anti-lock brakes system
• Backup lamps circuit
• Body control module (bcm) (lower left side of dash)
• Except 6.6l
• Exterior lights circuit
• G200 (on right front corner of hvac module)
• G401 (on left rear body mount)
• Hot at all times
• Hot w/ bck/up lamp relay energized
• Hot w/ park lamp relay energized
• J200
• J410
• J414 (in camper harness)
• J416 (129.5 cm from x414 breakout)
• J417
• J420 (in camper harness, 59.5 cm from x414 breakout)
• J421 (in camper harness, 205 cm from x414 breakout)
• Lt trailer
• Power distribution system
• Rt trailer
• Stud 1 fuse 68 fuse 63 40a
• Stud 2 fuse 63 fuse 58 30a
• Trailer brake controller solid state relay (20/30 series: left rear frame rail) (31 series: on left frame rail)
• Trailer connector (w/ truck trailer wiring harness) (at rear of vehicle)
• Trlr bck/up fuse 10 fuse 9 10a
• Trlr lt stop/turn pcb relay
• Trlr prk fuse 25 fuse 22 15a
• Trlr rt stop/turn pcb relay
• Trlr stop lt fuse 3 fuse 2 10a
• Trlr stop rt fuse 1 fuse 4 10a
• Turn sig lmp
• Underhood fuse block (left side of engine compt)
• W/ camper, 5th wheel trailer wiring provisions & 97 decibels electrical backup alarm
• W/ trailer brake control
• W/o trailer brake control
• X115
• X414

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (1 of 6) for GMC Sierra HD 2012 2500:

• (automatic a/c) heater coolent pump
• (diesel) fan relay
• (diesel) reductant line heater
• (diesel) reductant pump
• (diesel) reductant tank heater
• (hybrid propulsion) right generator control module coolant pump
• (if equipped) left front fog lamp
• (if equipped) right front fog lamp
• (if equipped) right horn
• (in auxiliary battery harness) j145
• (left side of engine compt) auxiliary fuse block
• (left side of engine compt) underhood fuse block
• (w/ 2 speed electric
• (w/ 2 speed manual shift control transfer case) transfer case shift control switch
• (w/ 2 speed manual/electric
• (w/ hybrid propulsion) left generator control module coolant pump
• 4.8l, 5.3l, 6.0l & 6.2l
• A/c compressor clutch
• Auxiliary battery relay (if equipped)
• Auxiliary battery run relay (if equipped)
• Battery current sensor (gasoline)
• Bck/up lamp pcb relay
• Chevrolet
• Chmsl pcb relay
• Cooling fan diode 1 (w/ 10 series)
• Diesel
• Diesel w/ auxiliary battery
• Engine cooling fan (diesel)
• Except diesel
• Except hybrid
• Except hybrid & w/ 10 series
• Fan cntrl relay
• Fan ctrl relay
• Fan low relay
• From ground g103 (diagram 2 of 6)
• Front drive axle actuator
• Front washer diode
• Fuel pmp relay
• G100 (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G102 (except 4.3l) (lower left front of engine)
• G104 (front of left cylinder head)
• G107 (4.3l) (top left rear of engine)
• G108 (on left side of firewall)
• Gas
• Gmc
• Hood ajar switch
• Hybrid
• Ignition coil
• J100 (in forward lamp harness, 7 cm from ambient air temperature sensor breakout)
• J101 (in forward lamp harness)
• J102 (in left headlamp harness)
• J103 (in right headlamp harness)
• J105 (4.3l (vin x): in engine 12 cm from ect harness, sensor breakout) (6.0l (vin j): in engine harness, approximately 18.5 cm from breakout to mass air flow/intake air temperature sensor)
• J117
• J141 (in pto jumper harness)
• Left battery
• Left engine cooling fan
• Left engine cooling fan resistor
• Left front side marker lamp
• Left high beam headlamp
• Left horn
• Left low beam headlamp
• Lower left park/turn signal lamp
• Lower right park/turn signal lamp
• Nca
• Rear defog relay
• Right battery
• Right front side marker lamp
• Right high beam headlamp
• Right low beam headlamp
• Run/ crnk relay
• Shift control transfer case & active 2 speed push button control transfer case)
• Strtr relay
• To auxiliary fuse block (diagram 2 of 6)
• To ground g103 (diagram 2 of 6)
• To right engine cooling fan (diagram 2 of 6)
• Transfer case shift control module
• Upper left park/turn signal lamp
• Upper right park/turn signal lamp
• W/ dual battery
• W/ keyless entry & pto
• W/ pto
• Windshield washer fluid level switch
• Windshield washer fluid pump
• Windshield wiper motor
• Wiper control pcb relay
• Wiper high speed diode
• Wiper low speed diode
• X1 a1
• X1 b
• X106 f
• X109 b7
• X110 d
• X111 a
• X113 a
• X122 b
• X124 d
• X2 n5
• X3 d
• X395 a4

Ground Distribution Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (2 of 6) for GMC Sierra HD 2012 2500:

• (4.8l/5.3l/ 6.2l) (4.3l/6.0l (vin g))
• (diesel) reductant sensor module
• (if equipped) garage door opener (gdo)
• (if equipped) inflatable restraint i/p module indicator
• (if equipped) power take off (pto) module
• (if equipped) sliding rear window switch
• (in engine harness, approximately 5 cm from automatic transmission auxiliary fluid pump control module breakout) (w/ hybrid propulsion) j122
• (left side of engine compt) auxiliary fuse block
• 4.3l
• 6 speed a/t
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission auxiliary fluid pump control module
• Bare
• Body control module
• Body control module (bcm)
• Diesel
• Engine control module
• Engine control module (ecm)
• Engine coolant level switch
• Engine oil level (eol) switch
• Except 4.3l
• Except diesel
• Except hybrid
• Exhaust gas recirculation (egr) valve shield
• Exhaust gas recirculation cooler bypass solenoid valve shield
• Fan high relay
• From splice j101 (diagram 1 of 6)
• From splice j105 (diagram 1 of 6)
• Front dome/ reading lamps
• Fuel filter pressure switch
• Fuel pressure regulator 1 shield
• Fuel pressure regulator 2 shield
• Fuse a 30a
• Fuse c 30a
• G103 (on front of right cylinder head)
• G106 (right rear of engine)
• G109 (diesel) (right front lower side of engine block)
• G110 (diesel) (left front lower side of engine block)
• Glow plug control module (gpcm)
• Hybrid propulsion
• Ignition control module (icm)
• Intake air valve shield
• J106 (except hybrid: in engine harness, 23 cm from map sensor breakout) (hybrid: in engine harness, approximately 8 cm from engine coolant temperature sensor breakout)
• J118
• J160
• J161
• J162
• J164
• J219 (in fuse block jumper harness)
• J323 (in overhead console harness, 4 cm from x304 breakout)
• Mass air flow (maf)/ intake air temperature (iat) sensors
• Mobile radio fuse block (behind right side of dash)
• Nca
• Park/ neutral position switch
• Relay a
• Relay b
• Right engine cooling fan
• Right engine cooling fan resistor
• Roof beacon relay
• Roof beacon switch
• Speed a/t
• To right battery (diagram 1 of 6)
• To splice j328 (diagram 3 of 6)
• Transmission control module (tcm)
• W/ hybrid propulsion ahs2
• W/ roof mounted lamp
• W/ wrecker emergency lamp, body builder emergency lamp & roof mounted lamp
• Water in fuel sensor
• X109 b5
• X121
• X179 n
• X225
• X226
• X395 a1

Ground Distribution Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (3 of 6) for GMC Sierra HD 2012 2500:

• (automatic a/c) inside air temperature sensor
• (hybrid) serial data gateway (sdg) module
• (if equipped) heated steering wheel
• (if equipped) heated steering wheel control module
• (if equipped) left sunshade
• (if equipped) rearview camera
• (in i/p harness, 13 cm from radio connector breakout) j203
• (in steering wheel harness, 4 cm from inflatable restraint steering wheel module coil x2)
• (on right front corner of hvac module) g200
• (w/ 2 speed electric shift control transfer case & active 2 speed push button cintrol transfer case) transfer case shift control switch
• (w/ wrecker emergency lamp) wrecker relay (w/ body builder emergency lamp) emergency vehicle roof lamp relay
• 3a7
• 4a7
• Accessory dc power control module
• Automatic a/c
• Automatic transmission shift lock control solenoid
• B x4
• Bare
• Blower motor control module
• Center console accessory power outlet
• Center console compartment accessory power outlet
• Center high mounted stop lamp (chmsl)
• Data link connector (dlc)
• Driver information center (dic) switch
• Electronic adjustable pedals pcb relay
• Electronic compass module
• Extended cab/crew cab
• From splice j323 (diagram 2 of 6)
• G112
• G202
• G403
• Heater, accessory steering control & automatic cruise control
• Horn switch
• Hvac control module
• Hybrid
• I/p 1 accessory power outlet
• I/p 2 accessory power outlet
• Inflatable restraint steering wheel module coil
• Inside rearview mirror (isrvm)
• J200 (in i/p harness, 14 cm from left i/p junction block breakout)
• J214
• J215 (in steering column harness)
• J324 (in sunroof harness, 3 cm from sunroof switch breakout)
• J334 (in right "a" pillar harness)
• Left front outer roof clearance lamp
• Left i/p junction block (lower left side of dash)
• Left steering wheel control switch
• Manual a/c
• Middle front roof clearance lamp
• Nca
• Park enable pcb relay
• Passenger door lock/ window switch
• Passenger outside rear view mirror
• Passenger window switch
• Rear dome/ reading lamps
• Right front outer roof clearance lamp
• Right i/p junction block (in right end of dash)
• Right steering wheel control switch
• Right sunshade (if equipped)
• Sunroof module
• Sunroof switch
• To splice j350 (diagram 5 of 6)
• W/ accessory steering control
• W/ accessory steering control & w/ odometer security wiring provisions
• W/ body builder emergency lamp
• W/ comfort & decor level 3
• W/ luxury edition
• W/ manual folding mirror & heated mirror
• W/ non bucket front individual seat & power mirrors
• W/ roof marker lamp
• W/ roof mounted lamp provisions
• W/ steering wheel heater
• W/ steering wheel heater & automatic cruise control
• W/ steering wheel heater, accessory steering control & automatic cruise control
• W/ sunroof mounted/sliding lamp provision
• W/ sunroof mounted/sliding lamp provision w/o roof marker lamp
• W/ sunroof sliding
• W/ wrecker emergency lamp
• W/o non bucket front individual seat & power mirrors
• W/o steering wheel
• W/o steering wheel heater
• Wheel harness)
• X1 a
• X14
• X2 d1
• X2 k
• X201 b6
• X209
• X224
• X276 b
• X277 b
• X301
• X313
• X6 b

Ground Distribution Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (4 of 6) for GMC Sierra HD 2012 2500:

• (crew cab & w/ non bucket front individual seats) lock/unlock pcb relay
• (hybrid) a/c compressor
• (if equipped) driver outside rearview mirror
• (if equipped) outside rearview mirror switch
• (if equipped) rearview camera image display module
• (in left front door harness) j502
• (not used) g1
• (w/ side door lock control & w/o non bucket front individual seats & power mirrors) lock pcb relay
• (w/ side door lock control & w/o non bucket front individual seats & power mirrors) unlock pcb relay
• 3a3
• A2 x303
• A2 x305
• Ambient light sensor
• Ambient light/ sunload sensor
• Automatic a/c
• Automatic transmission shift lever
• Body control module (bcm)
• Brake fluid level switch
• Data link connector
• Driver door latch
• Driver door lock switch
• Driver door lock/ window switch
• Driver seat back ventilation heating & cooling module
• Driver seat cushion ventilation heating & cooling module
• Driver window switch
• Except hybrid
• Front door lock diode
• Front door unlock diode
• G201 (upper left corner of dash)
• Headlamp & panel dimmer switch
• Hvac control module
• Hybrid
• Hybrid & w/o non bucket front individual seat
• I/p fuse block (left side of dash)
• I/p multi-function switch
• Instrument panel cluster (ipc)
• J201 (in i/p harness, in headlight & dimmer switch breakout)
• J230
• Left i/p junction block (lower left side of dash)
• Manual a/c
• Nca
• Passenger door latch
• Passenger door lock switch
• Passenger seat adjuster switch
• Passenger seat back ventilation heating & cooling module
• Passenger seat cushion ventilation heating & cooling module
• Passenger seat lumbar switch
• Rear door lock diode
• Rear door unlock diode
• Right i/p junction block (in right end of dash)
• Theft deterrent module
• To splice j304 (diagram 6 of 6)
• Turn signal/ multi-function switch
• W/ engine brake exhust, rear parking assist, active brake control & power adjustable pedals
• W/ front heated/ cooling seats
• W/ non bucket front individual seat
• W/ power door lock control
• W/ power window
• W/o non bucket, front individual seat, w/ comfort & decor level 3
• W/o power door lock control
• W/o power window
• Windshield wiper motor
• X1 e1
• X1 k2
• X201 a5
• X305

Ground Distribution Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (5 of 6) for GMC Sierra HD 2012 2500:

• (if equipped) backup alarm
• (if equipped) digital radio receiver
• (if equipped) rear seat audio (rsa) control
• (if equipped) vehicle communication interface module (vcim)
• (in camper harness, 232.5 cm from x414 breakout) j410
• (not used)
• (w/ premium performance enhanced audio) audio amplifier
• (w/o luxury edition & odometer security)
• 4.3l
• 6.0l (vin g)
• Chevrolet
• Chime module
• Diesel
• Diesel, w/ 31 series & w/o rear auxiliary fuel tank
• Digital video disc (dvd) control module
• Driver heated seat switch
• Electronic brake control module (ebcm)
• Except 4.3l & 6.0l (ving)
• From park enable pcb relay left i/p junction block (diagram 3 of 6)
• Front fuel pump & sender assembly
• Fuel pump
• Fuel pump flow control module
• Fuel pump/ trailer brake control module
• G300 (below driver's door, on body mount)
• G301 (below left side of passenger's seat)
• Gas
• Gmc
• Grd
• Heated seat control module
• Infrared transmitter
• J300 (in chassis harness, 15 cm from g300 breakout)
• J307
• J330 (in console harness, 12 cm from audio amplifier breakout)
• J350 (heated seat body harness, 5 cm into x332 breakout)
• Left i/p junction block (lower left side of dash)
• Lower right tail/ stop & turn signal lamp
• Nca
• Passenger heated seat switch
• Radio
• Rear fuel pump & sender assembly
• Rear lamps junction block (inside of left rear frame rail)
• Right backup lamp
• Right rear side marker lamp
• Secondary fuel pump relay
• To ground g401 (diagram 6 of 6)
• Trailer connector
• Upper right tail/ stop & turn signal lamp
• Video display
• W/ active brake & w/o 10 series
• W/ active brake, hybrid, 10 series & vacuum power brake
• W/ camper, 5th wheel trailer
• W/ camper, 5th wheel trailer & backup alarm
• W/ dual front door mounted & 4 speaker system
• W/ hydraulic power brake
• W/ integrated trailer brake
• W/ luxury edition
• W/ luxury edition & rear seat entertainment package
• W/ performance enhanced audio
• W/ radio
• W/ rear auxiliary fuel tank
• W/ spo dvd
• W/ spo heated seats
• W/o camper, 5th wheel trailer & backup alarm
• W/o integrated trailer brake
• W/o luxury edition
• W/o luxury edition & w/ rear seat entertainment package
• W/o performance enhanced audio
• W/o radio
• W/o rear auxiliary fuel tank
• W/o rear auxiliary fuel tank 6.0l (vin g)
• W/o rear seat radio & luxury edition
• X1 a5
• X1 b
• X12
• X129
• X2 d
• X204 m
• X212
• X331 b
• X414 b

Ground Distribution Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500

List of elements for Ground Distribution Wiring Diagram (6 of 6) for GMC Sierra HD 2012 2500:

• (if equipped) driver seat adjuster switch
• (if equipped) sliding rear window close relay
• (if equipped) sliding rear window open relay
• (in body harness, 14 cm from passenger seat in-line connector breakout)
• (in sliding rear window jumper harness)
• (w/ active brake control) yaw & lateral accelero-meter sensor
• (w/ door ajar indicator) remote control door lock receiver (rcdlr)
• 6.6l & 6.0l (vin g)
• A x700
• A x800
• B x319
• B x415
• B x416
• B3 x305
• B8 x303
• Center console accessory power outlet
• Center seat accessory power outlet
• Chevrolet
• Console compartment accessory power outlet
• Crew cab
• Crew cab/ extended cab w/ performance enhanced audio & front compartment console
• Directional passenger power seat adjuster
• Driver motor battery positive high voltage contractor relay
• Driver motor generator battery
• Driver motor generator battery control module
• Driver motor power inverter current limit relay
• Driver seat adjuster switch
• E x1
• Except crew cab
• Except hybrid
• Except regular cab
• Extended cab
• From splice j302 (diagram 6 of 6)
• From splice j314 (diagram 4 of 6)
• From splice j410 (diagram 5 of 6)
• Front passenger/child presence detector
• G302 (below right side of passenger's seat)
• G303 (extended cab/crew cab) (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• G307 (at right rear corner of passenger compt)
• G311
• G312
• G401 (on left rear body mount)
• G404 (mounted on fuel filler neck)
• Generator battery vent fan
• Gmc
• Grd
• Hybrid
• Hybrid except hybrid
• Inflatable restraint passenger presence system (pps) module
• Inflatable restraint sensing & diagnostic module (sdm)
• J304
• J335
• J355
• Left backup lamp
• Left front rear fender clearance lamp
• Left license lamp
• Left rear door latch
• Left rear most fender clearance lamp
• Left rear side marker lamp
• Left rear window switch
• Lower left tail/ stop & turn signal lamp
• M x800
• Memory seat module (msm)
• Nca
• Passenger seat belt buckle
• Rear lamps junction block (inside of left rear frame rail)
• Rear object sensor control module
• Rear window defogger grid
• Regular cab
• Right front rear fender clearance lamp
• Right license lamp
• Right rear door latch
• Right rear most fender clearance lamp
• Right rear window switch
• Tailgate marker lamp
• To driver motor generator battery (diagram 6 of 6)
• To ground g312 (diagram 6 of 6)
• Trailer brake control module
• Trailer brake control relay
• Upper left tail/ stop & turn signal lamp
• W/ full feature center seat
• W/ multi-
• W/ non bucket front individual seat
• W/ non-bucket front individual seat
• W/ power windows & full feature center seat
• W/ rear defogger
• W/ rear dual wheel
• W/ rear parking assist, low tire pressure & remote entry
• W/ remote entry lock control low tier pressure indictor, active brake control & w/ rear park assist
• W/ trailer brake
• W/active brake
• W/o active brake
• W/o multi- directional passenger power seat adjuster
• W/o non-bucket front individual seat
• W/o power windows & full feature center seat
• W/o rear defogger
• W/o rear parking assist, low tire pressure & remote entry
• W/o remote entry lock control low tier pressure indictor, active brake control & w/o rear park assist
• W/o trailer brake
• X2 a
• X303 f
• X305
• X305 h
• X319 b
• X320 b
• X350
• X700 a
• X700 m

HEADLIGHTS

Headlights Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Headlights Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• (except diesel: on lower right radiator support) (diesel: right front corner of engine compt) g101
• 175a
• Amb lght
• Body control module (bcm) (lower left side of dash)
• Chevrolet
• Computer data lines system
• Diesel
• Dimmer switch
• Drl 2 fuse 33 fuse 30 10a
• Drl rly
• Flash
• Flash to pass
• Fog lmp rly
• Fog lp sw
• G100
• G100 (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G201 (upper left corner of dash)
• Gasoline
• Gmc
• Hdlp dim sw sig
• Hdlp lo/hid relay
• Hdlp off
• Hdlp on
• Headlamp
• Hi beam pcb relay
• Hi beam rly
• Hi head- lamp lt fuse 32 fuse 29 10a
• Hi head- lamp rt fuse 30 fuse 21 10a
• Hot at all times
• If equipped
• J100
• J101
• J102
• J103
• J230
• Left front side marker lamp
• Left high beam headlamp
• Left low beam headlamp
• Lo beam rly
• Lo hdlp lt fuse 12 20a
• Lo hdlp rt fuse 16 fuse 15 20a
• Lower left park/turn signal lamp
• Lower right park/turn signal lamp
• Multi-function switch
• Pk brake sig
• Power distribution system
• Prk lmp
• Right front side marker lamp
• Right high beam headlamp
• Right low beam headlamp
• Serial data +
• Serial data -
• Switch
• Tan
• To fog lamp relay (diagram 2 of 2)
• To pass
• Turn signal/
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (diesel: right side of firewall) (except diesel: on positive battery terminal)
• Upper left park/turn signal lamp
• Upper right park/turn signal lamp
• X100
• X106
• X106 a
• X202

Headlights Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Headlights Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• Ambient light sensor (manual a/c) ambient light/ sunload sensor assembly (automatic a/c) (top center of dash)
• Auto
• Automatic a/c
• Computer data lines system
• Diesel
• Drl fuse 31 fuse 28 10a
• Drl pcb relay
• Fog lamp fuse 26 fuse 25 15a
• Fog lamp ind
• Fog lamp relay
• Fog lamp switch
• From hdlp lo/hid relay (diagram 1 of 2)
• G100 (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G201 (upper left corner of dash)
• Gasoline
• Gmlan serial data
• Ground distribution system
• Head
• Headlamp & panel dimmer switch
• Hi beam ind
• If equipped
• Instrument panel cluster (ipc)
• Ipc fuse 46 fuse 43 10a
• J201
• Left front fog lamp (if equipped)
• Left i/p junction block (lower left side of dash)
• Logic
• Manual a/c
• Off
• Park
• Park brake switch (on park brake pedal assembly)
• Power distribution system
• Right front fog lamp (if equipped)
• Underhood fuse block (left side of engine compt)

HORN

Horn Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Horn Wiring Diagram for GMC Sierra HD 2012 2500:

• (diesel)
• (gas)
• (on right front corner of hvac module)
• 175a
• B x1
• Body control module (lower left side of dash)
• G100 (except diesel: on lower left radiator support) (diesel: left front corner of engine compt)
• G101 (except diesel: on lower right radiator support) (diesel: right front corner of engine compt)
• G200
• Ground distribution system
• Horn fuse 29 fuse 26 15a
• Horn pcb relay
• Horn relay ctrl
• Horn switch
• Hot at all times
• Inflatable restraint steering wheel module coil (behind steering wheel)
• J x2
• J100
• J101
• J200
• J214
• J215
• Left horn (lower left front of vehicle)
• Power distribution system
• Right horn (lower right front of vehicle)
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• W/ high note dual horn & comfort, decor level 3 convenience package
• W/ horn/siren circuit wiring provisions
• W/ steering wheel heater
• W/ steering wheel heater, accessory steering control & automatic cruise control
• W/o steering wheel heater
• W/o steering wheel heater, accessory steering control & automatic cruise control
• X201
• X207
• X4 g1

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Instrument Cluster Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (on lower left front of engine) (except 6.6l & 4.3l) g102
• (top left rear of engine) (4.3l) g107
• 4wd ind
• 6.6l
• Abs ind
• Air bag ind
• Aux hvac-ign fuse 48 fuse 45 10a
• Body control module (bcm) (lower left side of dash)
• Brake fluid level switch (on brake master cylinder reservoir)
• Brake ind
• Brk fld sig
• Brk sw ctrl
• Charge ind
• Computer data lines system
• Coolant temperature gauge
• Cruise ind
• Decor level 3 convenience package
• Dic sw sig
• Dr door
• Driver information center (dic)
• Electronic compass module
• Engine controls system
• Except 6.6l
• Exhaust, rear parking assist, active brake control & power adjustable pedal
• Fog lamp ind
• Fuel gauge
• G103 (6.6l) (on front of right cylinder head)
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Gmlan serial
• Gnd
• High beam ind
• Hot at all times
• I/p multi-function switch
• Ign
• Ign 1
• Ign volt
• Instrument panel cluster (ipc)
• Interconnect network bus
• Interior lights system
• Ipc fuse 46 fuse 43 10a
• J105
• J201
• J220 (w/ steering wheel heater)
• J328
• Led cntrl
• Left i/p junction block (lower left side of dash)
• Left i/p junction block (lower left side of dash) x1
• Left turn ind
• Lf dr sw
• Linear
• Logic
• Low oil ind
• Low ref
• Low washer
• Lr dr sw
• Malfunction ind (mil)
• Mil cntrl
• Network bus
• Odometer
• Oil gauge
• Park brake switch (on park brake pedal assembly)
• Pass off ind ctrl
• Pass on ind ctrl
• Pass seat belt
• Pass seat belt ind
• Pnk
• Power distribution system
• Rf dr sw
• Right turn ind
• Rr dr sw
• Run/ crnk relay
• Run/crk
• Seat belt ind
• Security ind
• Speedometer
• Sw sig
• Tachometer
• Tan
• Tire pressure ind
• Tow/haul ind
• Traction control ind
• Transmission temperature gauge
• Underhood fuse block (left side of engine compt)
• Volts gauge
• W/ comfort &
• W/ engine brake
• Wait to start ind (6.6l)
• Wait to strt
• Wiper/washer system
• X10
• X202 b7

Instrument Cluster Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Instrument Cluster Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• (6.6l)
• (in chassis harness) j331
• (in front fuel tank) front fuel pump & sender assembly
• (in rear fuel tank) rear fuel pump & sender assembly
• (in rear of driver's front door) (w/ bucket seats & power mirrors) driver door latch assembly
• (inside fuel tank) primary fuel level sensor
• (on lower left "b" pillar) g303
• (on right front corner of hvac module) g200
• (rear of left rear door) (crew cab) left rear door latch assembly
• (rear of right rear door) (crew cab) right rear door latch assembly
• (w/ dual fuel tank) secondary fuel level sensor
• (w/ power windows) j502
• 3a5
• 4.3l
• 4.3l except
• 4.8l, 5.3l, 6.2l
• 5v ref
• 6.0l (vin g)
• 6.0l (vin j)
• 6.6l
• Computer data lines system
• Driver door latch assembly (w/o bucket seats & power mirrors) (in rear of driver's front door)
• Driver door lock/window switch
• Driver information center (dic) switch (w/ accessory steering control & odometer security wiring provisions)
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Engine oil level (eol) switch (left side of b engine oil pan)
• Engine oil pressure (eop) sensor (6.6l: lower left rear of engine) (4.3l: rear of engine) (except 6.6l & 4.3l: top rear of engine)
• Except hybrid
• Fuel lvl sig
• G110 (left front lower side of engine block)
• G201 (upper left corner of dash)
• G304 (on lower right "b" pillar)
• Hybrid
• I/p fuse block (left side of dash)
• Information vehicle
• Interior lights system
• J203
• J602 (w/ power door lock control)
• Lo ref
• Low ref
• Oil lvl sig
• Oil press sig
• Passenger door latch assembly (w/ bucket seats & power mirrors) (in rear of passenger's front door)
• Passenger door latch assembly (w/o bucket seats & power mirrors) (in rear of passenger's front door)
• Passenger door lock/window switch
• Personali- zation
• Pnk
• Right i/p junction block (in right end of dash)
• Ser data
• Serial data
• Set/ reset
• Sw sig
• Trip/fuel
• W/ 10 series
• W/ dual fuel tank
• W/ electronic door lock control
• W/o 10 series
• W/o electr0nic door lock control
• X113
• X131
• X202
• X300
• X501
• X700
• X800

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Courtesy Lamps Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• (in headliner harness, 15 cm from front inside air temperature sensor breakout) j327
• (not used)
• (rear of driver's door) driver door latch assembly
• (w/ power windows) j502
• 3 convenience package
• 3a5
• Body control module (bcm) (lower left side of dash)
• Center high mounted stop lamp (chmsl)
• Computer data lines system
• Courtesy lp sply volt
• Def sw
• Defeat sw
• Dim fuse 7 10a
• Dome lamps
• Dome sw
• Dr door rf dr ajar sw sig
• Except hybrid
• Front dome/reading lamps
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• G303 (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• Headlamp & panel dimmer switch
• Hot at all times
• Hybrid
• I/p fuse block (left side of dash)
• Is lps fuse 17 10a
• J201
• J323
• J328
• J602 (w/ power door lock control)
• Left i/p junction block (lower left side of dash)
• Left rear door latch assembly (crew cab) (rear of left rear door)
• Left sunshade (if equipped)
• Left vanity mirror lamp
• Lf dr ajar
• Lp ctrl sply
• Nca
• Passenger door latch assembly (in rear of passenger's door)
• Reading lamps
• Rear dome/ reading lamps (extended cab & crew cab)
• Right i/p junction block (in right end of dash)
• Right rear door latch assembly (crew cab) (rear of right rear door)
• Right sunshade (if equipped)
• Right vanity mirror lamp
• Rr dr ajar sw sig lr dr ajar sw sig
• Serial data
• Sw sig
• Volt
• W/ comfort & decor level
• W/ electric door lock
• W/o comfort & decor level
• W/o electric door lock
• X10
• X12
• X202
• X304
• X318
• X501
• X700
• X800

Courtesy Lamps Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Courtesy Lamps Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• (in headliner harness, 15 cm from front inside air temperature sensor breakout) j327
• (in right end of dash) right i/p junction block
• (not used)
• (on right front corner of hvac module) g200
• 3 convenience package
• 3b2
• 4a7
• Body control module (bcm) (lower left side of dash)
• Center high mounted stop lamp (chmsl)
• Computer data lines system
• Courtesy lp
• Courtesy lp ctrl
• Courtesy lp sply volt x6
• Ddm fuse 4 15a
• Def sw
• Defeat sw
• Dim fuse 7 10a
• Dome lamp
• Dome sw
• Driver door latch assembly (in rear of driver's frontdoor)
• Driver door lock/window switch
• Front dome/reading lamps
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• G303 (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• Gnd
• Headlamp & panel dimmer switch
• Hot at all times
• I/p fuse block (left side of dash)
• Is lps fuse 17 10a
• J201
• J323
• J328
• Left i/p junction block (lower left side of dash)
• Left rear door latch assembly (crew cab) (rear of left rear door)
• Left sunshade (if equipped)
• Left vanity mirror lamp
• Low ref
• Lr dr ajar sw sig
• Nca
• Passenger door latch assembly (in rear of passenger's front door)
• Passenger door lock/window switch
• Pdm fuse 9 15a
• Power distribution system
• Reading lamps
• Rear dome/ reading lamps (extended cab & crew cab)
• Right rear door latch assembly (crew cab) (rear of right rear door)
• Right sunshade (if equipped)
• Right vanity mirror lamp
• Rr dr ajar
• Ser data
• Serial data
• Sply volt
• Sw sig
• Volt
• W/ comfort & decor level
• W/ individual front seat & power mirror
• W/o comfort & decor level
• X10
• X12
• X304
• X318
• X700
• X800

Instrument Illumination Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Instrument Illumination Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (automatic a/c)
• (behind steering wheel)
• (heated seat body harness, 10 cm into heated seat switches breakout) (w/ spo heated seats) j352
• (heated seat body harness, 5 cm into heated seat switches breakout) (w/ spo heated seats) j351
• (lower left side of dash) left i/p junction block
• (on right front corner of hvac module)
• (on right front corner of hvac module) g200
• 12v
• A14
• Anti-lock brakes system
• Auto
• Body control module (bcm) (lower left side of dash)
• Bus led dim
• Computer data lines system
• Dim cntrl
• Dim ctrl
• Dim fuse 10a
• Dim sig
• Driver heated seat switch (w/ spo heated seats)
• Driver information center (dic) switch (w/ accessory steering wheel control)
• Exhaust brk sw sig x4
• G200
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Garage door opener & rear power sliding window
• Head
• Headlamp & panel dimmer switch
• Heated seats w/ spo
• Hot at all times
• Hvac control module (if equipped)
• I/p fuse block (left side of dash)
• I/p multi-function switch
• Ind ctrl
• Inflatable restraint steering wheel module coil x2
• Instrument panel cluster (ipc)
• Is lps fuse 10a
• J201
• J203
• J214
• J218 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• J350
• Left steering wheel control switch
• Logic
• Low ref
• Manual a/c & w/ spo heated seats
• Manual a/c & w/o spo heated seats
• Off
• Park
• Passenger heated seat switch (w/ spo heated seats)
• Power take off (pto) module (outside of right front chassis frame)
• Power take off (pto) switch (if equipped)
• Prk lp sig
• Radio
• Rear object sensor control module (rear parking assist) (at rear cargo area, behind trim panel)
• Right steering wheel control switch
• Rr prk assist x2
• Serial data
• Swc bklt fuse 3 2a
• Tan
• Trailer brake control module (except 10 series) fuel pump/trailer brake control module (10 series) (10 series: rear frame, (near spare tire mount) (20/30 series: left rear frame rail) (31 series: on left frame rail)
• Trailer brake control switch (if equipped)
• W/ accessory steering control & w/ adometer security wiring provisions
• W/ accessory steering wheel control
• W/ active brake control, adjustable power pedals, rear parking assist sensor indicator & heated windshield washer nozzles & hybrid
• W/ automatic cruise control, steering wheel heater & accessory steering wheel control
• W/ electric door lock control
• W/ luxury edition & odometer security
• W/ power windows w/o individual front seat & power mirror
• W/ roof mounted lamp, universal
• W/ spo heated seats
• W/ trailer brake control
• W/o accessory steering wheel control
• W/o individual front seat & power mirror
• W/o spo heated seats
• X10
• X102
• X11
• X123
• X201
• X202
• X205
• X212
• X333
• X334

Instrument Illumination Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Instrument Illumination Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• & power mirror
• (if
• (in right end of dash) right i/p junction block
• (w/ power door lock)
• 2 hi
• 2b4
• 3b5
• 4 hi
• 4 lo
• 4wd
• Auto
• Auto 4x4
• Awd
• Crew cab
• Driver door lock switch
• Driver window switch
• Electronic 4x4
• Equipped)
• Extended cab
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• G303 (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• Garage door opener (gdo) (if equipped)
• J200
• J322 (in overhead console harness, 5 cm from x304 breakout)
• J323
• J324
• J602
• J603
• J604 (in right front door harness)
• Lamp, universal garage door opener & rear power sliding window
• Left rear window switch
• Logic
• Outside rearview mirror switch
• Passenger door lock switch
• Passenger window switch
• Pnk
• Right rear window switch
• Roof beacon switch (w/ wrecker emergency lamp, body builder emergency lamp & roof mounted lamp)
• Seat & power mirror
• Sliding rear window switch (if equipped)
• Sunroof switch (if equipped)
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• W/ electric door lock control
• W/ power windows
• W/ power windows,
• W/ roof mounted
• W/o individual front
• W/o individual front seat & power mirror
• X304
• X313
• X700
• X800

MEMORY SYSTEMS

Adjustable Pedal Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Adjustable Pedal Wiring Diagram for GMC Sierra HD 2012 2500:

• (in driver seat harness, 5 cm from driver seat adjuster assembly)
• (lower left side of dash)
• 12v ref
• 5v ref
• A15
• Buckle) j312
• Computer data lines system
• Driver door lock/window switch
• Driver memory/heated seat switch
• Driver seat 2 circuit breaker cb3 25a
• Driver's memory seat circuit
• Dsm fuse 25 10a
• Electronic adjustable pedal (eap) assembly (under left side of dash)
• Exit
• Fwd ctrl
• G303 (on lower left "b" pillar)
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• I/p multi-function switch
• J306
• J309 (in driver seat harness, 20 cm from x303)
• J310
• Left i/p junction block (lower left side of dash)
• Left i/p junction block x2
• Logic
• Low ref
• Memory seat module (msm) (under front of driver's seat)
• Pnk
• Power distribution system
• Rwd ctrl
• Rwd sig
• Sens sig
• Ser data
• Serial data
• Sw sig
• Tan
• Tan a14
• X12
• X13
• X303

Driver"s Memory Seat Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Driver"s Memory Seat Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (in driver seat harness, 20 cm from x303) j309
• (in driver seat jumper harness, 10 cm into x324 breakout)
• (in driver seat jumper harness, 5 cm into x324 breakout)
• (in driver's seat back)
• (lower left side of dash) left i/p junction block
• 12v ref
• 5 cm from driver seat adjuster assembly)
• 5v ref
• A14
• A15
• Adjustable pedals circuit
• Down ctrl
• Driver seat 2 circuit breaker cb3 25a
• Driver seat adjuster assembly (on driver's seat track)
• Driver seat lumbar horizontal motor
• Driver seat lumbar horizontal motor position sensor (in driver's seat track)
• Driver seat lumbar vertical motor (in driver's seat back)
• Driver seat lumbar vertical motor position sensor (in driver's seat track)
• Driver seat recline motor (lower right side of driver seat back)
• Driver seat recline position sensor (in driver's seat back)
• Dsm fuse 25 10a
• Electronic adjustable pedal (eap) assembly (if equipped) (under left side of dash)
• Element ctrl
• Fwd ctrl
• G303 (on lower left "b" pillar)
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• J306
• J340
• J341
• Left i/p junction block (lower left side of dash)
• Memory seat module (under front of driver's seat)
• Pnk
• Power distribution system
• Rwd ctrl
• Seats system
• Sens sig
• Sply volt
• Tan
• Temp sig
• Up ctrl
• X12
• X13
• X303
• X324

Driver"s Memory Seat Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Driver"s Memory Seat Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• (not used)
• (not used) b
• 12v ref
• Adjustable pedals circuit
• Computer data lines system
• Down
• Down sw sig
• Driver door lock/ window switch
• Driver memory/heated seat switch
• Driver seat adjuster switch
• Driver seat lumbar switch
• Exit
• Frt vert dn sw
• Frt vert up sw
• Fwd
• Fwd sig
• Fwd sw sig
• Horz fwd sig
• Horz rwd sig
• I/p multi-function switch (w/ adjustable pedal)
• J312 (in driver seat harness, 5 cm from driver seat belt buckle)
• Left i/p junction block (lower left side of dash)
• Lh seat sig
• Logic
• Low ref
• Memory seat module (under front of driver's seat)
• Pnk
• Recln fwd sig
• Recln rwd sig
• Rh seat sig
• Rr vert dn sw
• Rr vert up sw
• Rwd
• Rwd sig
• Rwd sw sig
• Seats system
• Serial data
• Sw sig
• Tan
• Up sw sig
• X13
• X303

Memory Mirrors Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Memory Mirrors Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• 12v ref
• 5v ref
• Automatic day/night mirror
• Computer data lines system
• Ddm fuse 4 15a
• Defogger switch
• Down
• Driver door lock/ window switch
• Driver door lock/window switch
• Driver memory/heated seat switch
• Driver outside rearview mirror
• Electrochromic mirror circuit
• Exit
• Extend
• Extend ctrl
• Exterior lights system
• G201 (upper left corner of dash)
• Gnd
• Hot at all times
• Hvac control module
• I/p fuse block (left side of dash)
• J500 (in driver's outside rearview mirror jumper)
• J501 (in driver's outside rearview mirror jumper)
• L/r select
• Left
• Logic
• Low ref
• Mtr comm
• Outside rearview mirror switch
• Pnk
• Position ctrl
• Retract
• Retract ctrl
• Right
• Sens sig
• Serial data
• Sply volt
• Sw pwr
• Sw sig

Memory Mirrors Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Memory Mirrors Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 3b2
• 4a7
• 5v ref
• Computer data lines system
• Extend ctrl
• Exterior lights system
• G200 (on right front corner of hvac module)
• Gnd
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• J600 (in passenger's outside rearview mirror jumper)
• J601 (in passenger's outside rearview mirror jumper)
• Low ref
• Mtr comm
• Passenger door lock/ window switch
• Passenger outside rearview mirror
• Pdm fuse 9 15a
• Position ctrl
• Power distribution system
• Retract ctrl
• Right i/p junction block (in right end of dash) x6
• Sens sig
• Serial data
• Sply volt

NAVIGATION

Navigation Wiring Diagram, with UQA, without UYS & Y91 (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UQA, without UYS & Y91 (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• Amp fuse 41 fuse 38 30a
• Ampl cntrl
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Dash)
• Diesel
• Digital audio system
• Digital radio receiver (if equipped) (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of
• Info fuse 22 10a
• Interior lights system
• J307
• Keypad sig
• L aud+
• L aud-
• Left i/p junction block (lower left x3
• Lf aud+
• Lf aud-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pins: 6-16 not used
• Pnk
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig/ led cntrl
• Rf aud+
• Rf aud-
• Rr aud+
• Rr aud-
• Side of dash)
• Tan
• Tele sig
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/
• W/ on star
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic
• X12
• X122
• X203
• X204
• X212
• X213
• X213 coax
• X265
• X301
• X304

Navigation Wiring Diagram, with UQA, without UYS & Y91 (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UQA, without UYS & Y91 (2 of 3) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (under rear of center console) audio amplifier
• 2a1
• A13
• A14
• Ampl cntrl
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Nca
• Nca h
• Package
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rem enable
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Right i/p j/b (in right end of dash)
• Rr aud
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Subwoofer speaker
• Tan
• W/ rear seat entertainment
• X12
• X202
• X203
• X204
• X212
• X301

Navigation Wiring Diagram, with UQA, without UYS & Y91 (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UQA, without UYS & Y91 (3 of 3) for GMC Sierra HD 2012 2500:

• (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• 12 volt
• 3a1
• 3a2
• Accessory steering wheel control
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• B11
• B12
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Navigation Wiring Diagram, with UYS & UQA, without Y91 (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS & UQA, without Y91 (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Amp ctrl
• Amp fuse 41 fuse 38 30a
• Antenna
• Coax
• Computer data lines system
• Diesel
• Drain wire
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• Inside rearview mirror (isrvm)
• J328
• Left i/p junction block (lower left x3
• Lf aud+
• Lf aud-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Nca
• Onstar button assembly
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf aud+
• Rf aud-
• Rr aud+
• Rr aud-
• Side of dash)
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• X203
• X212
• X265

Navigation Wiring Diagram, with UYS & UQA, without Y91 (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS & UQA, without Y91 (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Dash)
• Digital audio system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of
• Info fuse 22 10a
• J307
• Keypad sig
• Low ref
• Nca
• Pins: 6-16 not used
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ on star
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X212
• X213 coax
• X301
• X304

Navigation Wiring Diagram, with UYS & UQA, without Y91 (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS & UQA, without Y91 (3 of 5) for GMC Sierra HD 2012 2500:

• (under rear of center console) audio amplifier
• 2a1
• A13
• A14
• Ampl cntrl
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• H nca
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J/b (lower left side of dash)
• J330
• L infrared
• L subwfr+
• L subwfr-
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Nca
• Package
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rem enable
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Right i/p j/b (in right end of dash)
• Rr aud
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Subwoofer speaker
• Tan
• W/ rear seat entertainment
• X12
• X202
• X204
• X212
• X301

Navigation Wiring Diagram, with UYS & UQA, without Y91 (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS & UQA, without Y91 (4 of 5) for GMC Sierra HD 2012 2500:

• 3a1
• 3a2
• Aud low ref
• B10
• B11
• B12
• Crew cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Navigation Wiring Diagram, with UYS & UQA, without Y91 (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS & UQA, without Y91 (5 of 5) for GMC Sierra HD 2012 2500:

• (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• 12 volt
• Accessory steering wheel control
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Camera sig (-)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217
• L aux aud
• L aux audio
• L dvd+
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Voice rec
• Voice sig/ drainwire
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control/
• W/o automatic cruise control
• X203
• X301

Navigation Wiring Diagram, with UYS without Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS without Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Antenna
• Coax
• Computer data lines system
• Diesel
• Dnd
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Hot at all times
• Inside rearview mirror (isrvm)
• J328
• Lf spk+
• Lf spk-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Onstar button assembly
• Radio
• Rdo fuse 42 fuse 39 15a
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• X203
• X212
• X265

Navigation Wiring Diagram, with UYS without Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS without Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• (or nca)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• J307
• Keypad sig
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ on star
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X203
• X204
• X212
• X213
• X304

Navigation Wiring Diagram, with UYS without Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS without Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system/vehicle communication system
• X202
• X204
• X212
• X301

Navigation Wiring Diagram, with UYS without Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS without Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 3a1
• 3a2
• Aud low ref
• B10
• Crew cab
• Crew cab/ extended cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• W/ dual extended range quarter
• W/ performance enhanced audio
• X204
• X206
• X212
• X306
• X700
• X800

Navigation Wiring Diagram, with UYS without Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS without Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500:

• 12 volt
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Camera sig (-)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aux aud
• L aux audio
• L dvd+
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Video sig/ drain wire
• Voice rec
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X203
• X301

Navigation Wiring Diagram, with UYS, Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• 2a1
• Amp fuse 41 fuse 38 30a
• Antenna
• Coax
• Computer data lines system
• Diesel
• Drain wire
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Inside rearview mirror (isrvm)
• J328
• Lf aud+
• Lf aud-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Nca
• Onstar button assembly
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf aud+
• Rf aud-
• Right i/p junction block (in right end of dash) x2
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• W/ onstar
• W/ rear seat entertainment package
• X203
• X265

Navigation Wiring Diagram, with UYS, Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Digital audio system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Keypad sig
• Left i/p junction block (lower left side of dash)
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X213
• X301
• X304

Navigation Wiring Diagram, with UYS, Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (left side of center console) noise compensation microphone
• (lower left side of dash) left i/p j/b
• (under rear of center console) audio amplifier
• Amplf+
• Amplf-
• Computer data lines system
• Drain wire
• F centr spk+
• F centr spk-
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Infrared ref
• Infrared v
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower x12
• Left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Micro sig
• Nca
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Subwoofer speaker
• Tan
• X12
• X301
• X309

Navigation Wiring Diagram, with UYS, Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500:

• 3a1
• 3a2
• Aud low ref
• B10
• B11
• B12
• C10
• C11
• C12
• Center i/p speaker
• Crew cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca h
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• X204
• X206
• X301
• X306
• X700
• X800

Navigation Wiring Diagram, with UYS, Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500:

• 12 volt
• Ampl+
• Ampl-
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (-)
• Camera video sig (+)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aux aud
• L aux audio
• L dvd+
• Low ref/ drain wire
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Voice rec
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X203
• X301

Navigation Wiring Diagram, with UYS, Y91 & without UQA (1 of 4) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & without UQA (1 of 4) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Antenna
• Coax
• Computer data lines system
• Diesel
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Inside rearview mirror (isrvm)
• J328
• Lf spk+
• Lf spk-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Onstar button assembly
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf spk+
• Rf spk-
• Rr aud+
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• W/ onstar
• X203
• X265

Navigation Wiring Diagram, with UYS, Y91 & without UQA (2 of 4) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & without UQA (2 of 4) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Digital audio system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• J307
• Keypad sig
• Left i/p junction block (lower left side of dash)
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X213
• X301
• X304

Navigation Wiring Diagram, with UYS, Y91 & without UQA (3 of 4) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & without UQA (3 of 4) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 3a1
• 3a2
• A13
• A14
• B10
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Drain wire
• Extended cab
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J330
• L infrared
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control (if equipped)
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Tan
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/ s-band digital audio system / vehicle comunication system
• X202
• X204
• X212
• X301
• X700
• X800

Navigation Wiring Diagram, with UYS, Y91 & without UQA (4 of 4) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with UYS, Y91 & without UQA (4 of 4) for GMC Sierra HD 2012 2500:

• 12 volt
• 2a1
• Anti-lock brakes system
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Low ref/ drain wire
• Navigation system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right i/p j/b (in right end of dash)
• Right steering wheel control switch
• Rse fuse 19 5a
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Voice sig/ref
• Volt
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel control
• W/ rear seat entertainment package
• W/o automatic cruise control
• X203
• X204
• X206
• X301
• X306

Navigation Wiring Diagram, with Y91 & UQA, without UYS (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91 & UQA, without UYS (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• 2a1
• Amp fuse 41 fuse 38 30a
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital radio receiver (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J204
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Left i/p junction block (lower left side of dash)
• Lf aud+
• Lf aud-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• Power distribution system
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig
• Rf aud+
• Rf aud-
• Right i/p junction block (in right end of dash) x2
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ audio sig
• W/ onstar
• W/ rear seat entertainment package
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X203
• X204
• X213
• X265
• X301
• X304

Navigation Wiring Diagram, with Y91 & UQA, without UYS (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91 & UQA, without UYS (2 of 3) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (left side of center console) noise compensation microphone
• (lower left side of dash) left i/p j/b
• (under rear of center console) audio amplifier
• Computer data lines system
• Drain wire
• F centr spk+
• F centr spk-
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower x12
• Left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Micro sig
• Nca
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Subwoofer speaker
• Tan
• X12
• X203
• X204
• X301
• X309

Navigation Wiring Diagram, with Y91 & UQA, without UYS (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91 & UQA, without UYS (3 of 3) for GMC Sierra HD 2012 2500:

• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• B11
• B12
• Body control module (bcm) (lower left side of dash)
• Center i/p speaker
• Computer data lines system
• Crew cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video cntrl
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X204
• X206
• X301
• X306
• X700
• X800

Navigation Wiring Diagram, with Y91, without UYS & UQA (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91, without UYS & UQA (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof) cellular/ navigation antenna cellular/ navigation & digital radio antenna
• (pins: 6-16 not used)
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital radio receiver (behind right end of dash)
• Drain wire
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J204
• J307
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Left i/p junction block (lower left side of dash)
• Lf spk+
• Lf spk-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• Power distribution system
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Traffic digital audio system
• Traffic digital audio system w/ s-band &
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ tele sig
• W/ onstar
• W/o onstar
• W/o s-band &
• X12
• X203
• X204
• X213
• X265
• X301
• X304

Navigation Wiring Diagram, with Y91, without UYS & UQA (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91, without UYS & UQA (2 of 3) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control (if equipped)
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system / vehicle comunication system
• X202
• X203
• X204
• X212
• X301

Navigation Wiring Diagram, with Y91, without UYS & UQA (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, with Y91, without UYS & UQA (3 of 3) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel control
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Navigation Wiring Diagram, without UYS, Y91 & UQA (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, without UYS, Y91 & UQA (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• (or nca)
• (pins: 6-16 not used)
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital audio system
• Digital radio receiver (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J307
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Lf spk+
• Lf spk-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ tele sig
• W/ on star
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X122
• X203
• X204
• X212
• X213
• X265
• X304

Navigation Wiring Diagram, without UYS, Y91 & UQA (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, without UYS, Y91 & UQA (2 of 3) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system/vehicle communication system
• X202
• X203
• X204
• X212
• X301

Navigation Wiring Diagram, without UYS, Y91 & UQA (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Navigation Wiring Diagram, without UYS, Y91 & UQA (3 of 3) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel heater
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Parking Assistant Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Parking Assistant Wiring Diagram for GMC Sierra HD 2012 2500:

• (below right side of passenger's seat) g302
• (license lamp harness, 20 cm from right rear object sensors)
• (license lamp harness, 28 cm from left rear object sensors) j403
• (upper left corner of dash) g201
• A14
• B10
• B11
• B12
• B13
• B14
• B15
• B5 x2
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Disable sig
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• I/p multi-function switch
• Ind dim
• Interior lights system
• J201
• J302
• J351 (heated seat body harness, 5 cm into heated seat switches breakout)
• J404
• Led disable
• Left i/p junction block (lower left side of dash)
• Left rear middle object sensor (left side of rear bumper)
• Left rear object corner sensor (left corner of rear bumper)
• Low ref
• Lr sns sig
• Obs det fuse 20 10a
• Rear object sensor control module (at rear cargo area, behind trim panel)
• Rear park assist disable switch
• Right rear corner object sensor (right corner of rear bumper)
• Right rear middle object sensor (right side of rear bumper)
• Rr sns sig
• W/ spo heated seats
• W/o spo heated seats
• X115
• X202
• X333
• X408

Rear View Camera Wiring Diagram, with SPO Accessory for GMC Sierra HD 2012 2500

List of elements for Rear View Camera Wiring Diagram, with SPO Accessory for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Body control module (bcm) (lower left side of dash)
• Camera sig +
• Camera sig -
• Camera video signal (+)
• Camera video signal (-)
• Computer data lines system
• G202
• Hot w/ run/ crnk relay energized
• Inside rearview mirror (isrvm)
• Lamp rly ctrl
• Logic
• Low speed serial data x3
• Mirror display
• Misc ign fuse 43 (gasoline) fuse 40 (diesel) 10a
• Nca
• Nca ignition voltage nca ground nca camera vid sig (-) nca bkup lp rly ctrl nca drain wire nca camera vid sig (+)
• Pnk
• Pnk a
• Power distribution system
• Radio
• Rearview camera (left of tailgate handle)
• Underhood fuse block (left side of engine compt)
• W/ front seat cooling heater
• W/ uys
• W/o uys
• X12
• X209
• X210

Rear View Camera Wiring Diagram, without SPO Accessory for GMC Sierra HD 2012 2500

List of elements for Rear View Camera Wiring Diagram, without SPO Accessory for GMC Sierra HD 2012 2500:

• (instrument panel harness, 6.5 cm from x205 breakout) (hybrid w/ engine control power take off (pto) controls) j280
• Backup lp rly ctrl
• Body control module (bcm) (lower left side of dash)
• Camera gnd
• Camera sig (+)
• Camera sig (-)
• Camera sig +
• Camera sig -
• Camera vid sig (+)
• Camera vid sig (-)
• Computer data lines system
• Drain wire
• G201 (upper left corner of dash)
• Ground
• Hot w/ run/ crnk relay energized
• Ign
• Image display mirror
• Inside rearview mirror (isrvm)
• J150 (chassis harness, 7 cm into x115 breakout)
• J281 (instrument panel harness, 10 cm into x115 breakout)
• J435 (chassis harness, 17 cm into rearview camera image display module breakout)
• Lamp rly ctrl
• Left i/p junction block (lower left side of dash)
• Logic
• Low speed serial data x3
• Misc ign fuse 43 (gasoline) fuse 40 (diesel) 10a
• Nca
• Nca c
• Pnk
• Pnk camera sig (+)
• Pnk ign
• Power distribution system
• Radio
• Rearview camera
• Rearview camera assembly
• Red
• Tan
• Underhood fuse block (left side of engine compt)
• W/ y91
• W/ y91 & uys
• W/ y91, drc & dd8
• W/o y91
• W/o y91 & uys
• W/o y91, drc & dd8
• X11
• X115
• X123
• X124
• X208
• X240
• X241

POWER DOOR LOCKS

Power Door Locks Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Power Door Locks Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• 3a4
• 3a6
• 3b3
• 3b4
• A13
• Ant
• Back door unlck diode
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Coax
• Comfort & decor level 3
• Computer data lines system
• Convenience package
• Dim fuse 7 10a
• Driver door latch assembly (rear of driver's door)
• Driver door lock switch
• Driver door unlck diode
• Driver information center (dic) display
• Dsm fuse 25 10a
• Except comfort & decor level 3
• Front door lck diode
• G201 (upper left corner of dash)
• G302 (below right side of passenger's seat)
• Gmlan
• Gnd
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• Instrument panel cluster (ipc)
• Interior lights system
• J502
• J602
• Keyless entry antenna
• Lck 1 fuse 21 15a
• Lck 2 fuse 11 15a
• Lck cntrl
• Lck sig
• Left rear door latch assembly (crew cab) (rear of left rear door)
• Lock actuator
• Lock pcb relay
• Logic
• Passenger door latch assembly (rear of passenger's front door)
• Passenger door lock switch
• Pdm fuse 9 drv unlck fuse 26 15a
• Power distribution system
• Rear door lck diode
• Remote control door lock receiver (rcdlr) (top rear of passenger compt)
• Right i/p junction block (in right x3 end of dash)
• Right rear door latch assembly (crew cab) (rear of right rear door)
• Security indicator
• System interior lights
• Tan
• Unlck 1 fuse 18 15a
• Unlck 2 fuse 10 15a
• Unlck cntrl
• Unlck sig
• Unlock pcb relay
• W/ power window
• W/o power window
• X202
• X501
• X600
• X700
• X800

Power Door Locks Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Power Door Locks Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• 3b2
• 4a7
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Coax
• Computer data lines system
• Ddm fuse 4 15a
• Dim fuse 7 10a
• Driver door latch assembly (in rear of driver's front door)
• Driver door lock actuator
• Driver door lock switch
• Driver door lock/ window switch
• Driver information center (dic) display
• Dsm fuse 25 10a
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• G302 (below right side of passenger's seat)
• Gmlan
• Gnd
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• Instrument panel cluster (ipc)
• Key switch
• Keyless entry antenna
• Lck 1 fuse 21 15a
• Lck cntrl
• Left rear door latch assembly (crew cab) (rear of left rear door)
• Level 3 convenience package
• Lock
• Lock actuator
• Lock/ unlock pcb relay
• Logic
• Low ref
• Passenger door latch assembly (in rear of passenger's front door)
• Passenger door lock actuator
• Passenger door lock switch
• Passenger door lock/ window switch
• Pdm fuse 9 15a
• Power distribution system
• Remote control door lock receiver (rcdlr) (top rear of passenger compt)
• Right i/p junction block (in right x6 end of dash)
• Right rear door latch assembly (crew cab) (rear of right rear door)
• Security indicator
• Sw sig
• Tan
• Unlck 1 fuse 18 15a
• Unlck cntrl
• Unlock
• W/ comfort & decor
• X700
• X800

POWER MIRRORS

Electrochromic Mirror Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Electrochromic Mirror Wiring Diagram for GMC Sierra HD 2012 2500:

• (except 4.3l & 6.6l: on lower left front of engine) (4.3l: top left rear of engine) (6.6l: on front of right cylinder head)
• (if equipped) mirror display
• 4.3l
• 6.6l
• Automatic day/night mirror
• Aux hvac ign fuse 45 fuse 48 10a
• Backup rly
• Body control module (bcm) (lower left side of dash)
• Driver door lock/ window switch
• Driver outside rearview mirror (w/ power folding mirror)
• Emergency sw
• Except 4.3l
• Except 4.3l & 6.6l
• Except 6.6l
• Exterior lights system
• G102 g107 g103
• G200 (on right front corner of hvac module)
• Gnd
• Green light
• Hot at all times
• I/p fuse block (left side of dash)
• Ign 1
• Inside rearview mirror (isrvm)
• J105
• J220 (w/ pnk
• J328
• Led sig
• Left i/p junction block (lower left side of dash)
• Logic
• Low ref
• Mirr sig
• Mirror day/night automatic
• Navigation system
• Onstar button assembly
• Onstar sw
• Pnk
• Power distribution system
• Red light
• Run/crank rly
• Run/crnk relay
• Selector switch
• Sig
• Steering wheel heater)
• Tele- phone sw
• Underhood fuse block (left side of engine compt)
• Vehicle communication interface module (vcim) (behind center of dash)
• Video sig +
• Video sig -
• Volt
• W/ comfort & decor level 3 convience package
• X10
• X203

Power Mirrors Wiring Diagram, with Power Folding Mirror (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Power Mirrors Wiring Diagram, with Power Folding Mirror (1 of 2) for GMC Sierra HD 2012 2500:

• 5v ref
• Automatic day/night mirror
• Computer data lines system
• Ddm fuse 4 15a
• Defogger switch
• Down
• Driver door lock/ window switch
• Driver outside rearview mirror
• Electrochromic mirror circuit
• Extend
• Extend ctrl
• Exterior lights system
• G201 (upper left corner of dash)
• Gnd
• Hot at all times
• Hvac control module
• I/p fuse block (left side of dash)
• J500 (in driver's outside rearview mirror jumper)
• J501 (in driver's outside rearview mirror jumper)
• L/r select
• Left
• Logic
• Low ref
• Mtr comm
• Outside rearview mirror switch
• Pnk
• Position ctrl
• Retract
• Retract ctrl
• Right
• Sens sig
• Serial data
• Sply volt
• Sw pwr

Power Mirrors Wiring Diagram, with Power Folding Mirror (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Power Mirrors Wiring Diagram, with Power Folding Mirror (2 of 2) for GMC Sierra HD 2012 2500:

• 3b2
• 4a7
• 5v ref
• Computer data lines system
• Extend ctrl
• Exterior lights system
• G200 (on right front corner of hvac module)
• Gnd
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• J600 (in passenger's outside rearview mirror jumper)
• J601 (in passenger's outside rearview mirror jumper)
• Low ref
• Mtr comm
• Passenger door lock/ window switch
• Passenger outside rearview mirror
• Pdm fuse 9 15a
• Position ctrl
• Power distribution system x1
• Retract ctrl
• Right i/p junction block (in right end of dash) x6
• Sens sig
• Serial data
• Sply volt

Power Mirrors Wiring Diagram, without Power Folding Mirror for GMC Sierra HD 2012 2500

List of elements for Power Mirrors Wiring Diagram, without Power Folding Mirror for GMC Sierra HD 2012 2500:

• Defogger system
• Down
• Driver outside rearview mirror
• Exterior lights system
• G201 (upper left corner of dash)
• Hot at all times
• I/p fuse block (left side of dash)
• Interior lights system
• J502
• Left
• Nca
• Outside rearview mirror switch
• Passenger outside rearview mirror
• Pwr mir fuse 14 2a
• Right
• Tan
• X500
• X600

POWER SEATS

Adjustable Pedal Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Adjustable Pedal Wiring Diagram for GMC Sierra HD 2012 2500:

• (except 6.6l) (6.6l)
• Body control module (bcm) (lower left side of dash)
• Eap fuse 38 fuse 35 15a
• Electronic adjustable pedal (eap) assembly (under left side of dash)
• Electronic adjustable pedals pcb relay
• Fwd
• G200 (on right front corner of hvac module)
• Hot at all times
• I/p multi-function switch
• J200
• Left i/p junction block (lower left side of dash)
• Park enable pcb relay
• Rwd
• Underhood fuse block (left side of engine compt)

Climate Control Seats Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Climate Control Seats Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• B10
• B12
• Computer data lines system
• Cooled seats fuse 24 30a x2
• Ddm fuse 4 15a
• Driver back heated seat element (in driver's seat back)
• Driver cushion heated seat element (in driver's seat cushion)
• Driver seat back ventilation heating & cooling module
• Driver seat cushion ventilation heating & cooling module
• G304 (on lower right "b" pillar)
• Gmlan
• Hot at all times
• I/p fuse block (left side of dash)
• J314
• J317
• J318
• J319 (in driver seat harness, 9 cm from heated seat cushion element breakout)
• Lh st sig
• Logic
• Memory seat module (msm) (under front of driver's seat)
• Passenger back heated seat element (in passenger's seat back)
• Passenger cushion heated seat element (in passenger's seat cushion)
• Passenger seat back ventilation heating & cooling module
• Passenger seat cushion ventilation heating & cooling module
• Pnk
• Rh st sig
• Tan
• X303
• X305

Climate Control Seats Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Climate Control Seats Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• (on right front corner of hvac module) g200
• 3b2
• 4a7
• Back ind
• Batt pos volt
• Bck &
• Bck & cush
• Computer data lines system
• Cool ind
• Cush
• Driver door lock/ window switch
• Driver memory/ heated & cooled seat switch
• Drv heat cool ctrl
• Drv heat cool sw sig
• Drv heat hi temp ctrl
• Drv heat lo temp ctrl
• Drv heat mid temp ctrl
• Drv seat back ctrl
• Drv st bck & csh ctrl
• G201 (upper left corner of dash)
• Gmlan serial data
• Gnd
• Ground distribution system
• Hi ind
• Hot at all times
• I/p fuse block (left side of dash)
• Lo ind
• Low reference
• Memory sw dim ctrl
• Mid ind
• Pas heat back ctrl
• Pas heat cool ctrl
• Pas heat cool sw sig
• Pas heat hi temp ctrl
• Pas heat lo temp ctrl
• Pas heat mid temp ctrl
• Pas seat back ctrl
• Pas st bck & csh ctrl
• Passenger door lock/ window switch
• Passenger memory/ heated & cooled seat switch
• Pdm fuse 9 15a
• Pnk
• Power distribution system
• Right i/p junction block (in right end of dash)
• Seat back
• Seat cool
• Seat heat
• Tan

Driver Power Seat Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Driver Power Seat Wiring Diagram for GMC Sierra HD 2012 2500:

• Driver seat 2 circuit breaker cb3 25a
• Driver seat adjuster motor assembly (on driver's seat track)
• Driver seat adjuster switch
• Driver seat front vertical motor
• Driver seat horizontal motor
• Driver seat rear vertical motor
• Fwd
• G303 (crew cab/ extended cab) (on lower left "b" pillar)
• G304 (regular cab) (on lower right "b" pillar)
• Hot at all times
• Left i/p junction block (lower left side of dash)
• Nca
• Rwd
• Tan
• X12
• X303

Heated Seats Wiring Diagram, with Memory (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Heated Seats Wiring Diagram, with Memory (1 of 2) for GMC Sierra HD 2012 2500:

• A10
• A11
• A12
• A13
• Computer data lines system
• Driver back heated seat element (in driver's seat back)
• Driver cushion heated seat element (in driver's seat cushion)
• Driver seat 2 circuit breaker cb3 25a
• Elem ctrl
• G303 (on lower left "b" pillar)
• Gnd
• Hot at all times
• J306
• J311 (heated driver seat harness, 10 cm from heated seat elements breakout)
• J316 (heated passenger seat harness, 10 cm from heated seat elements breakout)
• Left i/p junction block (lower left side of dash)
• Low ref
• Memory seat module (under front of driver's seat)
• Nca
• Passenger back heated seat element (in passenger's seat back)
• Passenger cushion heated seat element (in passenger's seat cushion)
• Pnk
• Serial data
• Sply volt
• Tan
• Temp sig
• X12
• X303
• X305

Heated Seats Wiring Diagram, with Memory (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Heated Seats Wiring Diagram, with Memory (2 of 2) for GMC Sierra HD 2012 2500:

• 3b2
• 4a7
• Back & cushion ind ctrl
• Back & cushion sw
• Back ind ctrl
• Back seat ind
• Back sig
• Computer data lines system
• Cushion/back ind
• Cushion/back sw
• Ddm fuse 4 15a
• Dimming ctrl
• Driver door lock/ window switch
• Driver heated seat switch
• Dsm fuse 25 10a
• G200 (on right front corner of hvac module)
• G201 (upper left corner of dash)
• Gnd
• Ground distribution system
• Hi temp ind ctrl
• High ind
• Hot at all times
• I/p fuse block (left side of dash)
• Low ind
• Low ref
• Low temp ind ctrl
• Med ind
• Med temp ind ctrl
• Passenger door lock/ window switch
• Passenger heated seat switch
• Pdm fuse 9 15a
• Power distribution system
• Right i/p junction block (in right end of dash)
• Seat back ind
• Seat back sw
• Serial data

Heated Seats Wiring Diagram, without Memory (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Heated Seats Wiring Diagram, without Memory (1 of 2) for GMC Sierra HD 2012 2500:

• (except 6.6l) (6.6l)
• Back & cushion heat ind
• Back heat
• Back heat ind
• Computer data lines system
• Cushion & back heat
• Cushion heat
• Cushion temp
• Driver back heated seat element (in driver's seat back)
• Driver cushion heated seat element (in driver's seat cushion)
• Element volt
• G200 (on right front corner of hvac module)
• Ground
• Ground distribution system
• Heated seat control module
• Heated seat cushion
• High heat ind
• Hot at all times
• J311 (heated driver seat harness, 10 cm from heated seat elements breakout)
• J316 (heated passenger seat harness, 10 cm from heated seat elements breakout)
• J350
• Left i/p junction block (lower left side of dash)
• Low heat ind
• Low ref
• Low speed gmlan
• Medium heat ind
• Nca
• Passenger back heated seat element (in passenger's seat back)
• Pnk
• Seat back heat
• Seat back temp
• Seo b2 fuse 37 fuse 34 30a
• Tan
• Underhood fuse block (left side of engine compt)
• X14
• X331
• X331 h
• X331 j
• X332
• X332 d

Heated Seats Wiring Diagram, without Memory (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Heated Seats Wiring Diagram, without Memory (2 of 2) for GMC Sierra HD 2012 2500:

• (heated seat body harness, 5 cm into heated seat switches breakout) j351
• Back
• Back ind
• Cushion & back
• Cushion & back ind
• Driver heated seat switch
• G200 (on right front corner of hvac module)
• High
• Interior lights system
• J350
• Low
• Mid
• Nca
• Passenger cushion heated seat element (in passenger's seat cushion)
• Passenger heated seat switch
• Pnk
• Tan
• X330
• X331
• X332

Heated Steering Wheel Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Heated Steering Wheel Wiring Diagram for GMC Sierra HD 2012 2500:

• (except 6.6l) (6.6l)
• (on right front corner of hvac module) g200
• 7.5a
• Aux hvac ign fuse 48 fuse 45 10a
• B10
• Body control module (bcm) (lower left side of dash)
• Dim sig
• G200 (on right front corner of hvac module)
• Gnd
• Heated steering fuse holder (on steering column)
• Heated steering wheel
• Heated steering wheel control module (in steering wheel)
• Heated steering wheel ind
• Heated steering wheel switch
• Hot w/ run/crnk relay energized
• Ign
• Inflatable restraint steering wheel module coil (behind steering wheel)
• Inflatable restraints steering wheel module coil (behind steering wheel)
• J214
• J215
• J220
• Led cntrl
• Left steering wheel control switch
• Nca
• Pnk
• Red
• Sns sig
• Sw sig
• Underhood fuse block (left side of engine compt)
• Volt ref
• Whl cntrl
• X201
• X276
• X277

Passenger Power Seat Wiring Diagram, 8-Way Power Seat for GMC Sierra HD 2012 2500

List of elements for Passenger Power Seat Wiring Diagram, 8-Way Power Seat for GMC Sierra HD 2012 2500:

• (in passenger's seat back)
• Fwd
• G304 (on lower right "b" pillar)
• Hot at all times
• J314
• J315
• Left i/p junction block (lower left side of dash)
• Nca
• Pass seat 1 circuit breaker cb2 25a
• Passenger seat adjuster motor assembly (on passenger's seat track)
• Passenger seat adjuster switch
• Passenger seat front vertical motor
• Passenger seat horizontal motor
• Passenger seat lumbar horizontal motor (in passenger's seat back)
• Passenger seat lumbar switch
• Passenger seat lumbar vertical motor
• Passenger seat rear vertical motor
• Passenger seat recline motor (lower right side of passenger's seat back)
• Pnk
• Rwd
• Tan
• X11
• X305
• X325

Passenger Power Seat Wiring Diagram, with 6-Way Power Seat for GMC Sierra HD 2012 2500

List of elements for Passenger Power Seat Wiring Diagram, with 6-Way Power Seat for GMC Sierra HD 2012 2500:

• Fwd
• G304 (on lower right "b" pillar)
• Hot at all times
• J304
• Left i/p junction block (lower left side of dash)
• Nca
• Pass seat 1 circuit breaker cb2 25a
• Passenger seat adjuster motor assembly (on passenger's seat track)
• Passenger seat adjuster switch
• Passenger seat front vertical motor
• Passenger seat horizontal motor
• Passenger seat rear vertical motor
• Rwd
• Tan
• X11
• X305

POWER TOP/SUNROOF

Power Top/Sunroof Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Power Top/Sunroof Wiring Diagram for GMC Sierra HD 2012 2500:

• (gasoline) (diesel)
• 2b1
• 2b3
• Acc volt
• B x313
• Close
• Comfort & decor level 3 convenience package w/o individual front seat & power mirror
• Crew cab
• Except comfort & decor level 3 convenience package w/o individual front seat & power mirror
• Express close (crew cab)
• Express open
• G200 (on right front corner of hvac module)
• Ground
• Hot at all times
• Illumination lamp
• Interior lights system
• J231
• J324
• Left i/p junction block (lower left side of dash)
• Open
• Pnk
• Power distribution system
• Right i/p junction block (in right end of dash) x2
• Roof close sig
• Roof open sig
• S/roof fuse 34 fuse 31 30a
• Sunroof module (in front of sunroof, above headliner)
• Sunroof motor
• Sunroof switch
• Sw xprs sig
• Underhood fuse block (left side of engine compartment)
• Underhood module (bcm) (lower left side of dash)
• Vent
• Vnt close sig
• Vnt open sig

POWER WINDOWS

Power Windows Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Power Windows Wiring Diagram, with Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• (in right end of dash) right i/p junction block
• (on lower left "b" pillar) (extend cab/ crew cab) g303
• (upper left corner of dash) g201
• 3b4
• Accessory voltage
• B+ volt
• Body control module (bcm) (lower left side of dash)
• Crew cab
• Down
• Down sig
• Driver window motor (inside driver's door)
• Driver window switch
• Express
• Extended cab w/ rear side access door
• G200 (on right front corner of hvac module)
• G304 (on lower right "b" pillar)
• Ground
• Hot at all times
• I/p fuse block (left side of dash)
• Illumination
• Interior lights system
• J231
• J502
• J603
• Left front window switch
• Left i/p junction block (lower left side of dash) x1
• Left rear window motor (in left rear door)
• Left rear window switch
• Lf down ctrl
• Lf up ctrl
• Lockout rr ctrl
• Lockout sig
• Logic
• Lr down ctrl
• Lr down sig
• Lr up ctrl
• Lr up sig
• Lt dr circuit breaker 25a
• Pass down sig
• Pass up sig
• Passenger window motor (inside passenger's door)
• Passenger window switch
• Rf down ctrl
• Rf up ctrl
• Right front window switch
• Right rear window motor (in right rear door)
• Right rear window switch
• Rr down ctrl
• Rr down sig
• Rr up ctrl
• Rr up sig
• Rt doors circuit breaker cb1 25a
• Sig
• Tan
• Up sig
• Window switch right rear
• X11
• X202
• X500
• X501
• X600
• X700
• X800

Power Windows Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500

List of elements for Power Windows Wiring Diagram, without Bucket Seats & Power Mirrors for GMC Sierra HD 2012 2500:

• (on lower left "b" pillar) (extend cab/ crew cab) g303
• (upper left corner of dash)
• 3b1
• 3b4
• 4a7
• B+ volt
• Body control module (bcm) (lower left side of dash)
• Crew cab
• Down
• Driver door lock/window switch
• Driver window motor (inside driver's door)
• Express
• Extended cab w/ rear side access door
• G200 (on right front corner of hvac module)
• G201
• G304 (on lower right "b" pillar)
• Ground
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• Illumination
• Interior lights system
• Left front window switch
• Left i/p junction block (lower left side of dash)
• Left rear window motor (in left rear door)
• Left rear window switch
• Lf down ctrl
• Lf up ctrl
• Lo spd serial data
• Lo speed serial data
• Lockout ind
• Lockout switch
• Logic
• Lr down ctrl
• Lr down sig
• Lr up ctrl
• Lr up sig
• Lt dr circuit breaker 25a
• Passenger door lock/window switch
• Passenger window motor (inside passenger's door)
• Pwr wnd lockout rr ctrl
• Pwr wnd lockout rr sig
• Pwr wnd motor rf down ctrl
• Pwr wnd motor rf up ctrl
• Pwr wnd motor rr down ctrl
• Pwr wnd motor rr up ctrl
• Pwr wnd sw lockout sig
• Pwr wnd sw lr down sig
• Pwr wnd sw lr up sig
• Pwr wnd sw rr down sig
• Pwr wnd sw rr up sig
• Pwr wnd switch rr down signal
• Pwr wnd switch rr up signal
• Right front window switch
• Right i/p junction block (in right end of dash)
• Right rear window motor (in right rear door)
• Right rear window switch
• Rt doors circuit breaker cb1 25a
• Signal
• Splice pack jx221 (in i/p harness, behind left side of dash)
• X11
• X700
• X800

Sliding Rear Window Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Sliding Rear Window Wiring Diagram for GMC Sierra HD 2012 2500:

• (except crew cab) (on lower right "b" pillar)
• (on right front corner of hvac module)
• Acces- sory voltage
• Body control module (bcm) (lower left side of dash)
• Close
• G200
• G304 g307 (crew cab) (at right rear corner of passenger compt)
• Hot at all times
• Illumi- nation
• Interior lights system
• J323
• J335
• J336
• Left i/p junction block (lower left side of dash)
• M tan
• Open
• Power distribution system
• Pwr rear wndw circuit breaker cb4 25a
• Sliding rear window close relay
• Sliding rear window motor (right rear of passenger compt)
• Sliding rear window open relay
• Sliding rear window switch
• Tan
• X12
• X208
• X304
• X320

RADIO

Radio Wiring Diagram, with UQA, without UYS & Y91 (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UQA, without UYS & Y91 (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• Amp fuse 41 fuse 38 30a
• Ampl cntrl
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Dash)
• Diesel
• Digital audio system
• Digital radio receiver (if equipped) (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of
• Info fuse 22 10a
• Interior lights system
• J307
• Keypad sig
• L aud+
• L aud-
• Left i/p junction block (lower left x3
• Lf aud+
• Lf aud-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pins: 6-16 not used
• Pnk
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig/ led cntrl
• Rf aud+
• Rf aud-
• Rr aud+
• Rr aud-
• Side of dash)
• Tan
• Tele sig
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/
• W/ on star
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic
• X12
• X122
• X203
• X204
• X212
• X213
• X213 coax
• X265
• X301
• X304

Radio Wiring Diagram, with UQA, without UYS & Y91 (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UQA, without UYS & Y91 (2 of 3) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (under rear of center console) audio amplifier
• 2a1
• A13
• A14
• Ampl cntrl
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Nca
• Nca h
• Package
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rem enable
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Right i/p j/b (in right end of dash)
• Rr aud
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Subwoofer speaker
• Tan
• W/ rear seat entertainment
• X12
• X202
• X203
• X204
• X212
• X301

Radio Wiring Diagram, with UQA, without UYS & Y91 (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UQA, without UYS & Y91 (3 of 3) for GMC Sierra HD 2012 2500:

• (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• 12 volt
• 3a1
• 3a2
• Accessory steering wheel control
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• B11
• B12
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Radio Wiring Diagram, with UYS & UQA, without Y91 (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS & UQA, without Y91 (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Amp ctrl
• Amp fuse 41 fuse 38 30a
• Antenna
• Coax
• Computer data lines system
• Diesel
• Drain wire
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• Inside rearview mirror (isrvm)
• J328
• Left i/p junction block (lower left x3
• Lf aud+
• Lf aud-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Nca
• Onstar button assembly
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf aud+
• Rf aud-
• Rr aud+
• Rr aud-
• Side of dash)
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• X203
• X212
• X265

Radio Wiring Diagram, with UYS & UQA, without Y91 (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS & UQA, without Y91 (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Dash)
• Digital audio system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of
• Info fuse 22 10a
• J307
• Keypad sig
• Low ref
• Nca
• Pins: 6-16 not used
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ on star
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X212
• X213 coax
• X301
• X304

Radio Wiring Diagram, with UYS & UQA, without Y91 (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS & UQA, without Y91 (3 of 5) for GMC Sierra HD 2012 2500:

• (under rear of center console) audio amplifier
• 2a1
• A13
• A14
• Ampl cntrl
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• H nca
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J/b (lower left side of dash)
• J330
• L infrared
• L subwfr+
• L subwfr-
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Nca
• Package
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rem enable
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Right i/p j/b (in right end of dash)
• Rr aud
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Subwoofer speaker
• Tan
• W/ rear seat entertainment
• X12
• X202
• X204
• X212
• X301

Radio Wiring Diagram, with UYS & UQA, without Y91 (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS & UQA, without Y91 (4 of 5) for GMC Sierra HD 2012 2500:

• 3a1
• 3a2
• Aud low ref
• B10
• B11
• B12
• Crew cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Radio Wiring Diagram, with UYS & UQA, without Y91 (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS & UQA, without Y91 (5 of 5) for GMC Sierra HD 2012 2500:

• (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• 12 volt
• Accessory steering wheel control
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Camera sig (-)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217
• L aux aud
• L aux audio
• L dvd+
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Voice rec
• Voice sig/ drainwire
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control/
• W/o automatic cruise control
• X203
• X301

Radio Wiring Diagram, with UYS without Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS without Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Antenna
• Coax
• Computer data lines system
• Diesel
• Dnd
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Hot at all times
• Inside rearview mirror (isrvm)
• J328
• Lf spk+
• Lf spk-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Onstar button assembly
• Radio
• Rdo fuse 42 fuse 39 15a
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• X203
• X212
• X265

Radio Wiring Diagram, with UYS without Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS without Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• (or nca)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• J307
• Keypad sig
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ on star
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X203
• X204
• X212
• X213
• X304

Radio Wiring Diagram, with UYS without Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS without Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system/vehicle communication system
• X202
• X204
• X212
• X301

Radio Wiring Diagram, with UYS without Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS without Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 3a1
• 3a2
• Aud low ref
• B10
• Crew cab
• Crew cab/ extended cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca gnd
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• W/ dual extended range quarter
• W/ performance enhanced audio
• X204
• X206
• X212
• X306
• X700
• X800

Radio Wiring Diagram, with UYS without Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS without Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500:

• 12 volt
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Camera sig (-)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aux aud
• L aux audio
• L dvd+
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Video sig/ drain wire
• Voice rec
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X203
• X301

Radio Wiring Diagram, with UYS, Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & UQA (1 of 5) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• 2a1
• Amp fuse 41 fuse 38 30a
• Antenna
• Coax
• Computer data lines system
• Diesel
• Drain wire
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Inside rearview mirror (isrvm)
• J328
• Lf aud+
• Lf aud-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Nca
• Onstar button assembly
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf aud+
• Rf aud-
• Right i/p junction block (in right end of dash) x2
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• W/ onstar
• W/ rear seat entertainment package
• X203
• X265

Radio Wiring Diagram, with UYS, Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & UQA (2 of 5) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Digital audio system
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Keypad sig
• Left i/p junction block (lower left side of dash)
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ onstar
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X213
• X301
• X304

Radio Wiring Diagram, with UYS, Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & UQA (3 of 5) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (left side of center console) noise compensation microphone
• (lower left side of dash) left i/p j/b
• (under rear of center console) audio amplifier
• Amplf+
• Amplf-
• Computer data lines system
• Drain wire
• F centr spk+
• F centr spk-
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Infrared ref
• Infrared v
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower x12
• Left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Micro sig
• Nca
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Subwoofer speaker
• Tan
• X12
• X301
• X309

Radio Wiring Diagram, with UYS, Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & UQA (4 of 5) for GMC Sierra HD 2012 2500:

• 3a1
• 3a2
• Aud low ref
• B10
• B11
• B12
• C10
• C11
• C12
• Center i/p speaker
• Crew cab
• Dvd comm
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Infrared transmitter
• L aud sig
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca h
• Nca video cntrl
• Nca video sig
• Pnk
• R aud sig
• R dvd+
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Shield)
• Signal+
• Signal-
• Tan
• Video display
• Volt
• X204
• X206
• X301
• X306
• X700
• X800

Radio Wiring Diagram, with UYS, Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & UQA (5 of 5) for GMC Sierra HD 2012 2500:

• 12 volt
• Ampl+
• Ampl-
• Anti-lock brakes system
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (-)
• Camera video sig (+)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd+
• Dvd-
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aux aud
• L aux audio
• L dvd+
• Low ref/ drain wire
• Navigation system
• Nca
• Next
• Pnk
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right steering wheel control switch
• Seek
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video sig
• Voice rec
• Voice sig/ low ref
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X203
• X301

Radio Wiring Diagram, with UYS, Y91 & without UQA (1 of 4) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & without UQA (1 of 4) for GMC Sierra HD 2012 2500:

• (pins: 21-27 not used)
• Antenna
• Coax
• Computer data lines system
• Diesel
• G200 (on right front corner of hvac module)
• Gasoline
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Inside rearview mirror (isrvm)
• J328
• Lf spk+
• Lf spk-
• Logic
• Low ref
• Lr aud+
• Lr aud-
• Onstar button assembly
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Rem sig
• Rf spk+
• Rf spk-
• Rr aud+
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Voice sig
• W/ onstar
• X203
• X265

Radio Wiring Diagram, with UYS, Y91 & without UQA (2 of 4) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & without UQA (2 of 4) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Coax
• Computer data lines system
• Digital audio system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• J307
• Keypad sig
• Left i/p junction block (lower left side of dash)
• Low ref
• Nca
• Pnk
• Red led
• Tan
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic
• X12
• X203
• X204
• X213
• X301
• X304

Radio Wiring Diagram, with UYS, Y91 & without UQA (3 of 4) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & without UQA (3 of 4) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 3a1
• 3a2
• A13
• A14
• B10
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Drain wire
• Extended cab
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• J330
• L infrared
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control (if equipped)
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Tan
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/ s-band digital audio system / vehicle comunication system
• X202
• X204
• X212
• X301
• X700
• X800

Radio Wiring Diagram, with UYS, Y91 & without UQA (4 of 4) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with UYS, Y91 & without UQA (4 of 4) for GMC Sierra HD 2012 2500:

• 12 volt
• 2a1
• Anti-lock brakes system
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• Body control module (bcm) (lower left side of dash)
• Camera sig (+)
• Computer data lines system
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Low ref/ drain wire
• Navigation system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right i/p j/b (in right end of dash)
• Right steering wheel control switch
• Rse fuse 19 5a
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Voice sig/ref
• Volt
• Volume down
• Volume up
• Vss
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel control
• W/ rear seat entertainment package
• W/o automatic cruise control
• X203
• X204
• X206
• X301
• X306

Radio Wiring Diagram, with Y91 & UQA, without UYS (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91 & UQA, without UYS (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (pins: 6-16 not used)
• 2a1
• Amp fuse 41 fuse 38 30a
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital radio receiver (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J204
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Left i/p junction block (lower left side of dash)
• Lf aud+
• Lf aud-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• Power distribution system
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig
• Rf aud+
• Rf aud-
• Right i/p junction block (in right end of dash) x2
• Rr aud+
• Rr aud-
• Rse fuse 19 5a
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ audio sig
• W/ onstar
• W/ rear seat entertainment package
• W/ s-band & traffic digital audio system
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X203
• X204
• X213
• X265
• X301
• X304

Radio Wiring Diagram, with Y91 & UQA, without UYS (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91 & UQA, without UYS (2 of 3) for GMC Sierra HD 2012 2500:

• (below left side of passenger's seat) g301
• (left side of center console) noise compensation microphone
• (lower left side of dash) left i/p j/b
• (under rear of center console) audio amplifier
• Computer data lines system
• Drain wire
• F centr spk+
• F centr spk-
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• L infrared
• L subwfr+
• L subwfr-
• Left i/p j/b (lower x12
• Left side of dash)
• Lf aud+
• Lf aud-
• Lf spk+
• Lf spk-
• Lr aud+
• Lr aud-
• Micro sig
• Nca
• Pnk
• R infrared
• R subwfr+
• R subwfr-
• Rear seat audio (rsa) control
• Rf aud+
• Rf aud-
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Subwoofer speaker
• Tan
• X12
• X203
• X204
• X301
• X309

Radio Wiring Diagram, with Y91 & UQA, without UYS (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91 & UQA, without UYS (3 of 3) for GMC Sierra HD 2012 2500:

• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• B11
• B12
• Body control module (bcm) (lower left side of dash)
• Center i/p speaker
• Computer data lines system
• Crew cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left front tweeter speaker
• Left rear speaker
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video cntrl
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control accessory steering wheel control
• W/o automatic cruise control
• X204
• X206
• X301
• X306
• X700
• X800

Radio Wiring Diagram, with Y91, without UYS & UQA (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91, without UYS & UQA (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof) cellular/ navigation antenna cellular/ navigation & digital radio antenna
• (pins: 6-16 not used)
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital radio receiver (behind right end of dash)
• Drain wire
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J204
• J307
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Left i/p junction block (lower left side of dash)
• Lf spk+
• Lf spk-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• Power distribution system
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rem sig
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Traffic digital audio system
• Traffic digital audio system w/ s-band &
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ tele sig
• W/ onstar
• W/o onstar
• W/o s-band &
• X12
• X203
• X204
• X213
• X265
• X301
• X304

Radio Wiring Diagram, with Y91, without UYS & UQA (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91, without UYS & UQA (2 of 3) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control (if equipped)
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system / vehicle comunication system
• X202
• X203
• X204
• X212
• X301

Radio Wiring Diagram, with Y91, without UYS & UQA (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, with Y91, without UYS & UQA (3 of 3) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel control
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Radio Wiring Diagram, without UYS, Y91 & UQA (1 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, without UYS, Y91 & UQA (1 of 3) for GMC Sierra HD 2012 2500:

• (left front of roof)
• (lower left side of dash) left i/p junction block
• (or nca)
• (pins: 6-16 not used)
• Antenna
• Aud sig
• Cellular telephone microphone (in overhead console)
• Cellular/ navigation & digital radio radio antenna
• Cellular/ navigation antenna
• Cellular/navigation & digital radio antenna (left front of roof)
• Coax
• Computer data lines system
• Diesel
• Digital audio system
• Digital radio receiver (behind right end of dash)
• Drain wire
• G nca
• G301 (below left side of passenger's seat)
• Gasoline
• Gmlan
• Gmlan+
• Gmlan-
• Gnd
• Green led
• Hot at all times
• I/p fuse block (left side of dash)
• Info fuse 22 10a
• Interior lights system
• J307
• Keypad sig
• L aud+
• L aud-
• Led cntrl
• Lf spk+
• Lf spk-
• Low ref
• Low ref/ drain wire
• Lr aud+
• Lr aud-
• Nca
• Pnk
• R aud+
• R aud-
• Radio
• Rdo fuse 42 fuse 39 15a
• Red led
• Rf spk+
• Rf spk-
• Rr aud+
• Rr aud-
• Tan
• Underhood fuse block (left side of engine compt)
• Usb cable
• Usb receptacle (if equipped)
• Vehicle communication interface module (vcim) (behind center of dash)
• Voice sig
• Voice sig/ tele sig
• W/ on star
• W/ onstar
• W/ s-band & traffic
• W/o onstar
• W/o s-band & traffic digital audio system
• X12
• X122
• X203
• X204
• X212
• X213
• X265
• X304

Radio Wiring Diagram, without UYS, Y91 & UQA (2 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, without UYS, Y91 & UQA (2 of 3) for GMC Sierra HD 2012 2500:

• 2a1
• A13
• A14
• Computer data lines system
• Drain wire
• G301 (below left side of passenger's seat)
• Gmlan
• Gnd
• Hot at all times
• I/p fuse block (left side of dash)
• Infrared ref
• Infrared v
• Inside rearview mirror (isrvm)
• J330
• L infrared
• Nca
• Pnk
• R infrared
• Rear seat audio (rsa) control
• Right i/p j/b (in right end of dash)
• Rse fuse 19 5a
• Tan
• W/ rear seat entertainment package
• W/ s-band digital audio system/vehicle communication system
• X202
• X203
• X204
• X212
• X301

Radio Wiring Diagram, without UYS, Y91 & UQA (3 of 3) for GMC Sierra HD 2012 2500

List of elements for Radio Wiring Diagram, without UYS, Y91 & UQA (3 of 3) for GMC Sierra HD 2012 2500:

• (w/ performance enhanced audio) left front tweeter speaker
• 12 volt
• 3a1
• 3a2
• Aud low ref
• Audio/video adapter
• Aux vid h
• Aux video h
• B10
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Crew cab/ extended cab
• Cruise control system
• Data bus (+)
• Data bus (-)
• Drain wire
• Dvd aud com
• Dvd aud sh
• Dvd comm
• Dvd+
• Dvd-
• Extended cab
• Gnd
• I/p fuse block (left side of dash)
• Inflatable restraint steering wheel module coil (if equipped) (behind steering wheel)
• Infrared transmitter
• Infrared+
• Infrared-
• J216 (in steering column harness)
• J217 (in steering wheel harness, 9 cm from inflatable restraint steering wheel module coil x2)
• L aud sig
• L aux aud
• L aux audio
• L dvd+
• Left front speaker
• Left rear speaker
• Mounted & dual front door mounted 4 speaker system
• Nca
• Nca b+
• Nca dvd+
• Nca dvd-
• Nca enable sig
• Nca gnd
• Nca video sig
• Next
• Pnk
• R aud sig
• R aux aud
• R aux audio
• R dvd+
• Radio
• Regular cab
• Right front speaker
• Right front tweeter speaker
• Right i/p junction block (in right end of dash)
• Right rear speaker
• Right steering wheel control switch
• Seek
• Shield)
• Signal+
• Signal-
• Source
• Sw sig
• Tan
• Transmissions system
• Video cntrl
• Video display
• Video sig
• Voice rec
• Volt
• Volume down
• Volume up
• W/ automatic cruise control
• W/ automatic cruise control/ accessory steering wheel heater
• W/ dual extended range quarter
• W/ performance enhanced audio
• W/o automatic cruise control
• X204
• X206
• X212
• X301
• X306
• X700
• X800

Video System Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Video System Wiring Diagram for GMC Sierra HD 2012 2500:

• (diesel)
• (gas)
• (lower left side of dash) left i/p junction block
• (on right front corner of hvac module)
• Clock sig
• Digital video disc (dvd) control module
• Driver seat headrest digital video disc (dvd) display
• Fm ant
• Fm antenna
• G200
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• I2c data
• Ign
• Ign volt
• J200
• L audio (+)
• Passenger seat headrest digital video disc (dvd) display
• Pnk
• R audio (+)
• Red
• Seo/alc fuse 54 fuse 51 10a
• Underhood fuse block (left side of engine compt)
• Video com (-)
• Video com(-)
• Video sig a (+)
• Video sig b (+)
• X14
• X371
• X372
• X373
• X374

SHIFT INTERLOCK

Shift Interlock Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Shift Interlock Wiring Diagram for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• (on lower left front of engine) (except 6.6l & 4.3l) g102
• (right rear of engine compt) drive motor generator power inverter module
• (top left rear of engine) (4.3l) g107
• 4-speed a/t
• 4.3l
• 6-speed a/t
• 6.0l (vin g)
• 6.0l (vin j) hybrid
• 6.6l
• Automatic transmission
• Automatic transmission internal mode switch
• Automatic transmission internal mode switch (ims)
• Automatic transmission shift lock control solenoid
• Body control module (bcm) (lower left side of dash)
• Brk sw sig
• Computer data lines system
• Control solenoid valve assembly
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except
• Except 4.3l
• Exterior lights system
• G103 (6.6l) (on front of right cylinder head)
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G200 (on right front corner of hvac module)
• Gmlan hi-spd (+)
• Gmlan hi-spd (-)
• Gnd
• Ground
• Hot at all times
• Ims ground
• J105
• J106
• J144
• J215
• Misc ign fuse 43 (except 6.6l) fuse 40 (6.6l) 10a
• P/n signal
• P/n switch
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pnk
• Power distribution system
• Run/crank relay
• Run/crank relay ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Transmission control module
• Transmission control module (left front of engine compt, near fan shroud)
• Transmission control module (tcm)
• Transmissions system
• Underhood fuse block (left side of engine compt)
• X175
• X205

STARTING/CHARGING

4.3L VIN X

4.3L VIN X, Charging Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Charging Wiring Diagram for GMC Sierra HD 2012 2500:

• 175a
• 4.3l
• 6.0l
• 6.2l, 5.3l & 4.8l
• Battery current sensor (4.3l: right rear of engine compt) (hybrid: left side of engine compt)
• Body control module (bcm) (lower left side of dash)
• Charge ind sig
• Charge indicator
• Computer data lines system
• Current sply
• Driver information center (dic)
• Engine control module (ecm) (left front of engine compt)
• G101 (on lower right radiator support)
• G103 (on front of right cylinder head)
• Generator
• Generator sig
• Hot at all times
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Logic
• Low ref
• Low speed gm lan serial data
• Mega fuse 175a
• Pnk
• Power distribution system
• Red
• Right battery
• Sens sig
• Serial data
• Serial data +
• Serial data -
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• Volt
• W/ 10 series
• X109

4.3L VIN X, Starting Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Starting Wiring Diagram for GMC Sierra HD 2012 2500:

• (on front of right cylinder head)
• (on front of right cylinder head) (6.6l) g103
• (on positive battery terminal)
• (right side of firewall) underhood fuse holder
• 175a
• 4 speed a/t
• 4.3l
• 4.8l
• 4.8l, 5.3l & 6.2l
• 5.3l & 6.2l
• 5v ref
• 6 speed a/t
• 6.0l
• 6.6l
• Acc
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Data bus +
• Data bus -
• Engine control module (ecm) (left front of engine compt)
• Except 6.6l
• F x2
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l) (on lower left front of engine)
• G103
• G103 (4.8l) (on front of right cylinder head)
• G103 (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G107 (4.3l) (top left rear of engine)
• Gnd
• Ign 3 volt
• Ignition switch
• J105
• J106
• J144
• Lock
• Low ref
• Mega fuse 175a
• Park/ neutral position (pnp) switch (on left rear side of transmission)
• Park/neutral signal
• Power distribution system
• Red
• Right battery
• Run
• Serial data +
• Serial data -
• Start
• Starter motor
• Strt rly ctrl
• Strtr fuse 62 (except 6.6l) fuse 57 (6.6l) 40a
• Strtr relay
• Tan
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission park/neutral
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder
• X175
• X179

4.8L VIN A

4.8L VIN A, Charging Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Charging Wiring Diagram for GMC Sierra HD 2012 2500:

• 175a
• 4.3l
• 6.0l
• 6.2l, 5.3l & 4.8l
• Battery current sensor (4.3l: right rear of engine compt) (hybrid: left side of engine compt)
• Body control module (bcm) (lower left side of dash)
• Charge ind sig
• Charge indicator
• Computer data lines system
• Current sply
• Driver information center (dic)
• Engine control module (ecm) (left front of engine compt)
• G101 (on lower right radiator support)
• G103 (on front of right cylinder head)
• Generator
• Generator sig
• Hot at all times
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Logic
• Low ref
• Low speed gm lan serial data
• Mega fuse 175a
• Pnk
• Power distribution system
• Red
• Right battery
• Sens sig
• Serial data
• Serial data +
• Serial data -
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• Volt
• W/ 10 series
• X109

4.8L VIN A, Starting Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Starting Wiring Diagram for GMC Sierra HD 2012 2500:

• (on front of right cylinder head)
• (on front of right cylinder head) (6.6l) g103
• (on positive battery terminal)
• (right side of firewall) underhood fuse holder
• 175a
• 4 speed a/t
• 4.3l
• 4.8l
• 4.8l, 5.3l & 6.2l
• 5.3l & 6.2l
• 5v ref
• 6 speed a/t
• 6.0l
• 6.6l
• Acc
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Data bus +
• Data bus -
• Engine control module (ecm) (left front of engine compt)
• Except 6.6l
• F x2
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l) (on lower left front of engine)
• G103
• G103 (4.8l) (on front of right cylinder head)
• G103 (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G107 (4.3l) (top left rear of engine)
• Gnd
• Ign 3 volt
• Ignition switch
• J105
• J106
• J144
• Lock
• Low ref
• Mega fuse 175a
• Park/ neutral position (pnp) switch (on left rear side of transmission)
• Park/neutral signal
• Power distribution system
• Red
• Right battery
• Run
• Serial data +
• Serial data -
• Start
• Starter motor
• Strt rly ctrl
• Strtr fuse 62 (except 6.6l) fuse 57 (6.6l) 40a
• Strtr relay
• Tan
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission park/neutral
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder
• X175
• X179

5.3L VIN 0

5.3L VIN 0, Charging Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Charging Wiring Diagram for GMC Sierra HD 2012 2500:

• 175a
• 4.3l
• 6.0l
• 6.2l, 5.3l & 4.8l
• Battery current sensor (4.3l: right rear of engine compt) (hybrid: left side of engine compt)
• Body control module (bcm) (lower left side of dash)
• Charge ind sig
• Charge indicator
• Computer data lines system
• Current sply
• Driver information center (dic)
• Engine control module (ecm) (left front of engine compt)
• G101 (on lower right radiator support)
• G103 (on front of right cylinder head)
• Generator
• Generator sig
• Hot at all times
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Logic
• Low ref
• Low speed gm lan serial data
• Mega fuse 175a
• Pnk
• Power distribution system
• Red
• Right battery
• Sens sig
• Serial data
• Serial data +
• Serial data -
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• Volt
• W/ 10 series
• X109

5.3L VIN 0, Starting Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Starting Wiring Diagram for GMC Sierra HD 2012 2500:

• (on front of right cylinder head)
• (on front of right cylinder head) (6.6l) g103
• (on positive battery terminal)
• (right side of firewall) underhood fuse holder
• 175a
• 4 speed a/t
• 4.3l
• 4.8l
• 4.8l, 5.3l & 6.2l
• 5.3l & 6.2l
• 5v ref
• 6 speed a/t
• 6.0l
• 6.6l
• Acc
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Data bus +
• Data bus -
• Engine control module (ecm) (left front of engine compt)
• Except 6.6l
• F x2
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l) (on lower left front of engine)
• G103
• G103 (4.8l) (on front of right cylinder head)
• G103 (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G107 (4.3l) (top left rear of engine)
• Gnd
• Ign 3 volt
• Ignition switch
• J105
• J106
• J144
• Lock
• Low ref
• Mega fuse 175a
• Park/ neutral position (pnp) switch (on left rear side of transmission)
• Park/neutral signal
• Power distribution system
• Red
• Right battery
• Run
• Serial data +
• Serial data -
• Start
• Starter motor
• Strt rly ctrl
• Strtr fuse 62 (except 6.6l) fuse 57 (6.6l) 40a
• Strtr relay
• Tan
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission park/neutral
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder
• X175
• X179

5.3L VIN 7

5.3L VIN 7, Charging Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Charging Wiring Diagram for GMC Sierra HD 2012 2500:

• 175a
• 4.3l
• 6.0l
• 6.2l, 5.3l & 4.8l
• Battery current sensor (4.3l: right rear of engine compt) (hybrid: left side of engine compt)
• Body control module (bcm) (lower left side of dash)
• Charge ind sig
• Charge indicator
• Computer data lines system
• Current sply
• Driver information center (dic)
• Engine control module (ecm) (left front of engine compt)
• G101 (on lower right radiator support)
• G103 (on front of right cylinder head)
• Generator
• Generator sig
• Hot at all times
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Logic
• Low ref
• Low speed gm lan serial data
• Mega fuse 175a
• Pnk
• Power distribution system
• Red
• Right battery
• Sens sig
• Serial data
• Serial data +
• Serial data -
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• Volt
• W/ 10 series
• X109

5.3L VIN 7, Starting Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Starting Wiring Diagram for GMC Sierra HD 2012 2500:

• (on front of right cylinder head)
• (on front of right cylinder head) (6.6l) g103
• (on positive battery terminal)
• (right side of firewall) underhood fuse holder
• 175a
• 4 speed a/t
• 4.3l
• 4.8l
• 4.8l, 5.3l & 6.2l
• 5.3l & 6.2l
• 5v ref
• 6 speed a/t
• 6.0l
• 6.6l
• Acc
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Data bus +
• Data bus -
• Engine control module (ecm) (left front of engine compt)
• Except 6.6l
• F x2
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l) (on lower left front of engine)
• G103
• G103 (4.8l) (on front of right cylinder head)
• G103 (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G107 (4.3l) (top left rear of engine)
• Gnd
• Ign 3 volt
• Ignition switch
• J105
• J106
• J144
• Lock
• Low ref
• Mega fuse 175a
• Park/ neutral position (pnp) switch (on left rear side of transmission)
• Park/neutral signal
• Power distribution system
• Red
• Right battery
• Run
• Serial data +
• Serial data -
• Start
• Starter motor
• Strt rly ctrl
• Strtr fuse 62 (except 6.6l) fuse 57 (6.6l) 40a
• Strtr relay
• Tan
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission park/neutral
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder
• X175
• X179

6.2L VIN 2

6.2L VIN 2, Charging Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Charging Wiring Diagram for GMC Sierra HD 2012 2500:

• 175a
• 4.3l
• 6.0l
• 6.2l, 5.3l & 4.8l
• Battery current sensor (4.3l: right rear of engine compt) (hybrid: left side of engine compt)
• Body control module (bcm) (lower left side of dash)
• Charge ind sig
• Charge indicator
• Computer data lines system
• Current sply
• Driver information center (dic)
• Engine control module (ecm) (left front of engine compt)
• G101 (on lower right radiator support)
• G103 (on front of right cylinder head)
• Generator
• Generator sig
• Hot at all times
• Instrument panel cluster (ipc)
• Ipc fuse 46 10a
• Logic
• Low ref
• Low speed gm lan serial data
• Mega fuse 175a
• Pnk
• Power distribution system
• Red
• Right battery
• Sens sig
• Serial data
• Serial data +
• Serial data -
• Tan
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder (on positive battery terminal)
• Volt
• W/ 10 series
• X109

6.2L VIN 2, Starting Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Starting Wiring Diagram for GMC Sierra HD 2012 2500:

• (on front of right cylinder head)
• (on front of right cylinder head) (6.6l) g103
• (on positive battery terminal)
• (right side of firewall) underhood fuse holder
• 175a
• 4 speed a/t
• 4.3l
• 4.8l
• 4.8l, 5.3l & 6.2l
• 5.3l & 6.2l
• 5v ref
• 6 speed a/t
• 6.0l
• 6.6l
• Acc
• Allison transmission 6 speed a/t
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Data bus +
• Data bus -
• Engine control module (ecm) (left front of engine compt)
• Except 6.6l
• F x2
• G101 (diesel: right front corner of engine compt) (except diesel: on lower right radiator support)
• G102 (except 6.6l & 4.3l) (on lower left front of engine)
• G103
• G103 (4.8l) (on front of right cylinder head)
• G103 (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• G107 (4.3l) (top left rear of engine)
• Gnd
• Ign 3 volt
• Ignition switch
• J105
• J106
• J144
• Lock
• Low ref
• Mega fuse 175a
• Park/ neutral position (pnp) switch (on left rear side of transmission)
• Park/neutral signal
• Power distribution system
• Red
• Right battery
• Run
• Serial data +
• Serial data -
• Start
• Starter motor
• Strt rly ctrl
• Strtr fuse 62 (except 6.6l) fuse 57 (6.6l) 40a
• Strtr relay
• Tan
• Transmission control module (tcm)
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Transmission park/neutral
• Underhood fuse block (left side of engine compt)
• Underhood fuse holder
• X175
• X179

SUPPLEMENTAL RESTRAINTS

Supplemental Restraints Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (top right side of dash) inflatable restraint i/p module
• 6.0l (vin j)
• 6.6l
• Air bag batt fuse 45 fuse 42 15a
• Air bag ign fuse 40 fuse 37 10a
• Batt pos voltage
• Computer data lines system
• Convience package w/0 non-bucket front individual seat & o/s mirrors
• Disable sw rtn
• Disable switch
• Driver inflatable restraint roof rail module (behind left side of headliner trim)
• Except 6.0l (vin j)
• Except 6.6l
• Extended cab/ crew cab
• G302 (below right side of passenger's seat)
• Gmlan serial data
• Gnd
• High control stage 1
• High control stage 2
• High ctrl i/p stage 2
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign 1 voltage
• Inflatable restraint i/p module disable switch (w/manual suppression switch)
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Inflatable restraint steering wheel module (in steering wheel)
• Inflatable restraint steering wheel module coil (behind steering wheel)
• L side impact sens sig
• Left front inflatable restraint side impact sensor (sis) (in driver's door)
• Left i/p junction block (lower left side of dash)
• Left inflatable restraint front end sensor (w/ 10 series) inflatable restraint front end sensor (w/o 10 series) (w/ 10 series: on lower left radiator support) (w/o 10 series: behind center of front bumper)
• Low control stage 1
• Low control stage 2
• Low ctrl i/p stage 1
• Low ctrl i/p stage 2
• Low ref
• Lt hi roof rail ctrl
• Lt high ctrl
• Lt lo roof rail ctrl
• Lt low ctrl
• Nca
• Pin shorting bars engaged when module connector is disconnected from harness: (shorting bars are connected between following pins: conn x1: 1-2, 3-4, 5-6 & 7-8 conn x2: 13-14, 15-16 7-8 & 13-14
• Pnk
• R side impact sens sig
• Regular cab
• Right front inflatable restraint side impact sensor (sis) (in passenger's door)
• Right inflatable restraint front end sensor (w/ 10 series) (on lower right radiator support)
• Right inflatable restraint side impact module (w/ 10 series) (outer side of right front seat back)
• Rt high ctrl
• Rt low ctrl
• Rt sig
• Sensor sig
• Shorting bar
• Stage 1
• Stage 2
• Tan
• Underhood fuse block (left side of engine compt)
• W/ 10 series
• W/ 20/30/31 series
• W/ child presence detector
• W/ comfort & decor level 3
• W/ non-bucket front individual seat & o/s mirrors w/o comfort & decor level 3 convience package
• W/o 10 series
• W/o child presence detector
• X1 n5
• X103
• X11
• X202
• X2oo b1
• X4 d4
• X5 g2
• X500
• X502
• X601

Supplemental Restraints Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• (below right side of pass- enger's seat) g302
• (below right side of passenger's seat) g302
• (except crew cab) j308
• (on right "b" pillar) passenger seat belt pretensioner
• (w/ multi directional passenger power seat adjaster)
• (w/manual suppression switch & child
• 6.0l (vin j)
• A x303
• Air bag ind
• Back light ind
• Bar shorting
• Belt ind seat
• Cab
• Computer data lines system
• Crew cab
• Ctrl on ind
• Data
• Data serial
• Driver inflatable restraint seat position sensor (w/ 10 series) (right front corner of driver's seat track)
• Driver seat belt buckle
• Driver seat belt pretensioner (on left "b" pillar)
• Driver seat belt switch
• Except 6.0l (vin j)
• Except crew cab
• Extended
• Extended cab/ crew cab
• G200 (on right front corner of hvac module)
• High ctrl
• Ign
• Individual seat
• Inflatable restraint passenger presence system (pps) module (w/ child presence detector) (under front passenger seat)
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Instrument panel cluster (ipc)
• J305 (w/ 10 series) (in driver seat harness, 5 cm from x303)
• J323
• J355
• J355 (w/ multi- directional passenger power seat adjuster)
• Left i/p junction block (lower left side of dash)
• Left inflatable restraint side impact module (w/ 10 series) (outer side of left front seat back)
• Left rear inflatable restraint side impact sensor (sis) (in left rear door)
• Logic
• Low ctrl
• Low ref
• Lt seat pos sens sig
• Nca
• Off ind ctrl
• Pass
• Passenger air bag off
• Passenger air bag on
• Passenger inflatable restraint roof rail module (behind right side of headliner trim)
• Passenger inflatable restraint seat belt tension sensor (w/ child presence detector)
• Passenger inflatable restraint seat position sensor (w/ 10 series & except crew cab)
• Passenger seat belt buckle
• Passenger seat belt ind
• Passenger seat belt switch (w/ 10 series)
• Pin shorting bars engaged when module connector is disconnected from harness: (shorting bars are connected between following pins: conn x2: 37-38, 39-40 & 53-54)
• Pnk
• Pnk d
• Presence detector) inflatable restraint i/p module indicator
• Regular cab
• Right rear inflatable restraint side impact sensor (sis) (in right rear door)
• Rt high ctrl
• Rt low ctrl
• Rt seat belt sw
• Rt seat belt sw sig
• Rt seat pos sens sig
• Seat belt
• Seat belt ind
• Sens module sig
• Sens sig
• Serial data
• Shorting bar
• Voltage
• W/ child presence detector
• W/ non-bucket front
• W/o non-bucket front
• X2 b
• X303 a8
• X304
• X305
• X305 g
• X700
• X800

TRANSMISSION

4.3L VIN X

4.3L VIN X, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Acc wake up data
• Anti-lock brakes system
• Bat pos volt
• Brk sw sig
• Computer data lines system
• Exterior lights system
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• Gnd
• Hi spd gmlan data (+)
• Hi spd gmlan data (-)
• Hot at all times
• Hot w/ run/crank relay energized
• Ign 1 volt
• Iss sig
• J106
• J130
• Low ref
• Misc ign fuse 43 10a
• P/n
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pc sol hi ctrl
• Pc sol low sig
• Pnk
• Power distribution system
• Replicated tos sig
• Sol 1 vlv ctrl
• Sol 2 vlv ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcc pwm ctrl
• Tcc sol valve ctrl
• Tcm-batt fuse 14 10a
• Tft sens sig
• Tr sw sig 1
• Tr sw sig a
• Tr sw sig b
• Tr sw sig p
• Trans ig1 fuse 19 15a
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss low sig
• W/ 2 speed transfer case
• W/o 2 speed transfer case
• X175
• X179
• X205

4.3L VIN X, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid (ss) valve
• 4.3l
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission shift lever
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 4.3l
• G201 (upper left corner of dash)
• Hi spd gmlan +
• Hi spd gmlan -
• Input shaft speed sensor (iss)
• Instrument panel cluster (ipc)
• J116
• J230
• Lo gm gmlan
• Logic
• Mil ind
• Mil ind ctrl
• Mil sig
• Nca
• Park/neutral sig
• Pressure control (pc) solenoid valve
• Prnd321
• Red
• Replicated tos sig
• Tan
• Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve
• Torque converter clutch (tcc) solenoid valve
• Tow/ haul ind
• Tow/haul sw sig
• Tow/haul switch
• X109
• X175

4.3L VIN X, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

4.3L VIN X, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 4.3L VIN X, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

4.8L VIN A

4.8L VIN A, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Acc wake up data
• Anti-lock brakes system
• Bat pos volt
• Brk sw sig
• Computer data lines system
• Exterior lights system
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• Gnd
• Hi spd gmlan data (+)
• Hi spd gmlan data (-)
• Hot at all times
• Hot w/ run/crank relay energized
• Ign 1 volt
• Iss sig
• J106
• J130
• Low ref
• Misc ign fuse 43 10a
• P/n
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pc sol hi ctrl
• Pc sol low sig
• Pnk
• Power distribution system
• Replicated tos sig
• Sol 1 vlv ctrl
• Sol 2 vlv ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcc pwm ctrl
• Tcc sol valve ctrl
• Tcm-batt fuse 14 10a
• Tft sens sig
• Tr sw sig 1
• Tr sw sig a
• Tr sw sig b
• Tr sw sig p
• Trans ig1 fuse 19 15a
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss low sig
• W/ 2 speed transfer case
• W/o 2 speed transfer case
• X175
• X179
• X205

4.8L VIN A, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid (ss) valve
• 4.3l
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission shift lever
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 4.3l
• G201 (upper left corner of dash)
• Hi spd gmlan +
• Hi spd gmlan -
• Input shaft speed sensor (iss)
• Instrument panel cluster (ipc)
• J116
• J230
• Lo gm gmlan
• Logic
• Mil ind
• Mil ind ctrl
• Mil sig
• Nca
• Park/neutral sig
• Pressure control (pc) solenoid valve
• Prnd321
• Red
• Replicated tos sig
• Tan
• Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve
• Torque converter clutch (tcc) solenoid valve
• Tow/ haul ind
• Tow/haul sw sig
• Tow/haul switch
• X109
• X175

4.8L VIN A, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

4.8L VIN A, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 4.8L VIN A, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

5.3L VIN 0

5.3L VIN 0, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Acc wake up data
• Anti-lock brakes system
• Bat pos volt
• Brk sw sig
• Computer data lines system
• Exterior lights system
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• Gnd
• Hi spd gmlan data (+)
• Hi spd gmlan data (-)
• Hot at all times
• Hot w/ run/crank relay energized
• Ign 1 volt
• Iss sig
• J106
• J130
• Low ref
• Misc ign fuse 43 10a
• P/n
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pc sol hi ctrl
• Pc sol low sig
• Pnk
• Power distribution system
• Replicated tos sig
• Sol 1 vlv ctrl
• Sol 2 vlv ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcc pwm ctrl
• Tcc sol valve ctrl
• Tcm-batt fuse 14 10a
• Tft sens sig
• Tr sw sig 1
• Tr sw sig a
• Tr sw sig b
• Tr sw sig p
• Trans ig1 fuse 19 15a
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss low sig
• W/ 2 speed transfer case
• W/o 2 speed transfer case
• X175
• X179
• X205

5.3L VIN 0, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid (ss) valve
• 4.3l
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission shift lever
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 4.3l
• G201 (upper left corner of dash)
• Hi spd gmlan +
• Hi spd gmlan -
• Input shaft speed sensor (iss)
• Instrument panel cluster (ipc)
• J116
• J230
• Lo gm gmlan
• Logic
• Mil ind
• Mil ind ctrl
• Mil sig
• Nca
• Park/neutral sig
• Pressure control (pc) solenoid valve
• Prnd321
• Red
• Replicated tos sig
• Tan
• Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve
• Torque converter clutch (tcc) solenoid valve
• Tow/ haul ind
• Tow/haul sw sig
• Tow/haul switch
• X109
• X175

5.3L VIN 0, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

5.3L VIN 0, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 0, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

5.3L VIN 7

5.3L VIN 7, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Acc wake up data
• Anti-lock brakes system
• Bat pos volt
• Brk sw sig
• Computer data lines system
• Exterior lights system
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• Gnd
• Hi spd gmlan data (+)
• Hi spd gmlan data (-)
• Hot at all times
• Hot w/ run/crank relay energized
• Ign 1 volt
• Iss sig
• J106
• J130
• Low ref
• Misc ign fuse 43 10a
• P/n
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pc sol hi ctrl
• Pc sol low sig
• Pnk
• Power distribution system
• Replicated tos sig
• Sol 1 vlv ctrl
• Sol 2 vlv ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcc pwm ctrl
• Tcc sol valve ctrl
• Tcm-batt fuse 14 10a
• Tft sens sig
• Tr sw sig 1
• Tr sw sig a
• Tr sw sig b
• Tr sw sig p
• Trans ig1 fuse 19 15a
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss low sig
• W/ 2 speed transfer case
• W/o 2 speed transfer case
• X175
• X179
• X205

5.3L VIN 7, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid (ss) valve
• 4.3l
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission shift lever
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 4.3l
• G201 (upper left corner of dash)
• Hi spd gmlan +
• Hi spd gmlan -
• Input shaft speed sensor (iss)
• Instrument panel cluster (ipc)
• J116
• J230
• Lo gm gmlan
• Logic
• Mil ind
• Mil ind ctrl
• Mil sig
• Nca
• Park/neutral sig
• Pressure control (pc) solenoid valve
• Prnd321
• Red
• Replicated tos sig
• Tan
• Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve
• Torque converter clutch (tcc) solenoid valve
• Tow/ haul ind
• Tow/haul sw sig
• Tow/haul switch
• X109
• X175

5.3L VIN 7, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

5.3L VIN 7, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 5.3L VIN 7, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

6.0L VIN J

6.0L VIN J, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash)
• (on front of right cylinder head) g103
• (or 821)
• Anti-lock brakes system
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission fluid temperature (tft) sensor signal
• Batt +
• Brake pedal sig
• Computer data lines system
• Control solenoid value assembly
• Data bus (+)
• Data bus (-)
• Drive motor generator power inverter module (right rear of engine compt)
• Driver information center (dic) display
• Engine control module (ecm) (left front of engine compt)
• Exterior lights system
• Gmlan
• Gmlan data bus (+)
• Gmlan data bus (-)
• Gnd
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Instrument cluster panel (ipc)
• Internal mode sw (ims) gnd
• J106
• J124
• J130 (w/ active two speed push button control transfer case)
• Left i/p junction block
• Logic
• Low reference
• Misc ign fuse 43 10a
• Pc solenoid 1 control
• Pc solenoid 2 control
• Pc solenoid 3 control
• Pc solenoid 4 control
• Pc solenoid 5 control
• Pc solenoid 6 control
• Pnk
• Pnk a3 pnk
• Pnk a4 pnk
• Power distribution system
• Pressure control (pc) solenoid valve 1
• Pressure control (pc) solenoid valve 2
• Pressure control (pc) solenoid valve 3
• Pressure control (pc) solenoid valve 4
• Pressure control (pc) solenoid valve 5
• Pressure control (pc) solenoid valve 6
• Replicated tos signal
• Serial data bus (+)
• Serial data bus (-)
• Shift solenoid (ss) 1 control
• Shift solenoid (ss) 2 control
• Shift solenoid (ss) valve 1
• Shift solenoid (ss) valve 2
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcm-batt fuse 14 10a
• To automatic transmission internal mode switch (ims) (diagram 2 of 2)
• Trans ign1 fuse 19 15a
• Transmission control module (tcm)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss sig
• W/ active two speed push button control transfer case
• W/0 active two speed push button control transfer case
• Wake up serial data
• X205

6.0L VIN J, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• (diagram 1 of 2)
• (in transmission, on control solenoid valve assembly)
• 12v ref
• A/t manual shift switch
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Automatic transmission internal mode switch (ims)
• Automatic transmission shift lever
• Body control module (lower left side of dash)
• Computer data lines system
• Control solenoid valve assembly
• Cruise control system
• From automatic transmission a
• Ftp switch 1 voltage
• Ftp switch 3 voltage
• Ftp switch 4 voltage
• Ftp switch 5 voltage
• Gmlan serial data bus +
• Gmlan serial data bus -
• Gnd
• J216
• Nca
• Output speed sensor (oss)
• Output speed sensor (oss) signal
• Pnk
• Red
• Start
• Tan
• Tap up/ tap down sw sig
• Transmission control module (tcm)
• Transmission range switch sig a
• Transmission range switch sig b
• Transmission range switch sig c
• Transmission range switch sig p
• X176

6.0L VIN J, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

6.0L VIN J, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 6.0L VIN J, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

6.2L VIN 2

6.2L VIN 2, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, A/T Wiring Diagram (1 of 2) for GMC Sierra HD 2012 2500:

• (lower left side of dash) left i/p junction block
• Acc wake up data
• Anti-lock brakes system
• Bat pos volt
• Brk sw sig
• Computer data lines system
• Exterior lights system
• G103 (except 4.3l) (on front of right cylinder head)
• G106 (4.3l) (right rear of engine)
• Gnd
• Hi spd gmlan data (+)
• Hi spd gmlan data (-)
• Hot at all times
• Hot w/ run/crank relay energized
• Ign 1 volt
• Iss sig
• J106
• J130
• Low ref
• Misc ign fuse 43 10a
• P/n
• Park/neutral position (pnp) switch (on left rear side of transmission)
• Pc sol hi ctrl
• Pc sol low sig
• Pnk
• Power distribution system
• Replicated tos sig
• Sol 1 vlv ctrl
• Sol 2 vlv ctrl
• Stop lamp switch (top of brake pedal assembly)
• Tan
• Tcc pwm ctrl
• Tcc sol valve ctrl
• Tcm-batt fuse 14 10a
• Tft sens sig
• Tr sw sig 1
• Tr sw sig a
• Tr sw sig b
• Tr sw sig p
• Trans ig1 fuse 19 15a
• Transmission control module (tcm) (left front of engine compt, near fan shroud)
• Underhood fuse block (left side of engine compt)
• Vehicle speed sensor (vss) (on transfer case tailshaft housing)
• Vss hi sig
• Vss low sig
• W/ 2 speed transfer case
• W/o 2 speed transfer case
• X175
• X179
• X205

6.2L VIN 2, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, A/T Wiring Diagram (2 of 2) for GMC Sierra HD 2012 2500:

• 1-2 shift solenoid (ss) valve
• 2-3 shift solenoid (ss) valve
• 4.3l
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission shift lever
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Engine control module (ecm) (left front of engine compt, near fan shroud)
• Except 4.3l
• G201 (upper left corner of dash)
• Hi spd gmlan +
• Hi spd gmlan -
• Input shaft speed sensor (iss)
• Instrument panel cluster (ipc)
• J116
• J230
• Lo gm gmlan
• Logic
• Mil ind
• Mil ind ctrl
• Mil sig
• Nca
• Park/neutral sig
• Pressure control (pc) solenoid valve
• Prnd321
• Red
• Replicated tos sig
• Tan
• Torque converter clutch (tcc) pulse width modulation (pwm) solenoid valve
• Torque converter clutch (tcc) solenoid valve
• Tow/ haul ind
• Tow/haul sw sig
• Tow/haul switch
• X109
• X175

6.2L VIN 2, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Transfer Case Wiring Diagram, 2-Speed Manual for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.ol & 6.2l)
• (6.6l)
• (gas) (diesel)
• (lower left side of dash) left i/p junction block
• (on lower left front of engine)
• (top left rear of engine) g107
• 4.3l
• 4.8l, 5.3l, 6.0l (vin j) & 6.2l
• 4wd ind
• 4wd low sig
• 6.0l (vin g)
• 6.6l
• Aux hvac-ign fuse 48 fuse 45 10a
• Axle sw sig
• Computer data lines system
• Engine control module (ecm) (except hybrid: left front of engine compt, near fan shroud) (hybrid: left front of engine compt)
• Front axle actuator (on front axle assembly)
• G102 g103 (on front of right cylinder head)
• G201 (upper left corner of dash)
• Gmlan bus +
• Gmlan bus -
• Gnd
• Ground distribution system
• Hot w/ run/crnk relay energized
• Ign
• Instrument panel cluster (ipc)
• J105
• J130 (6.0l (vin g)
• J220 (w/ steering pnk
• Logic
• Pnk
• Ser data
• Tan
• Trans ign 1 fuse 19 fuse 13 10a
• Transfer case shift control switch (on top left of transfer case)
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• X110
• X2 n4 pnk
• X5 g4

6.2L VIN 2, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500

List of elements for 6.2L VIN 2, Transfer Case Wiring Diagram, 2-Speed with Push Button Control for GMC Sierra HD 2012 2500:

• (4.3l)
• (4.8l, 5.3l, 6.0l & 6.2l)
• (in i/p harness, in x103 breakout 7 cm from main harness assembly)
• (lower left side of dash) left i/p junction block
• 2 hi ind ctrl
• 2-hi ind
• 2a4
• 4 hi ind ctrl
• 4 lo ind ctrl
• 4-hi ind
• 4-lo ind
• 4wd ind
• 5 volt ref
• 8v sply
• A3 pnk
• Accy wakeup srl data
• Auto 4wd
• Aux hvac-ign fuse 48 fuse 45 10a
• Awd ind ctrl
• Axle actr ctrl
• Axle sw sig
• B11
• B12
• Batt +
• Body control module (lower left side of dash)
• Brake control
• C10
• C11
• Computer data lines system
• Diesel
• Dirtn sig
• Front axle actuator (on front axle assembly)
• G102 (on lower left front of engine)
• G107 (top left rear of engine)
• G201 (upper left corner of dash)
• G4 pnk
• Gas
• Gmlan bus +
• Gmlan bus -
• Gmlan bus-
• Gnd
• Ground distribution system
• Hot at all times
• Hot w/ run/crnk relay energized
• Ign
• Ign 1 volt
• Incrmt encoder directn sig
• Incrmt encoder impulse sig
• Instrument cluster panel (ipc)
• Interior lights system
• J105
• J113
• J130
• J220 (w/ steering pnk
• Left i/p junction block (lower left side of dash)
• Lo ref
• Lock sol ctrl
• Logic
• Low ref
• Misc ign fuse 43 fuse 40 10a
• Mtr ctrl a
• Mtr ctrl b
• Neutral ind
• Neutral ind ctrl
• Pnk
• Pnk c
• Power distribution system
• Pulse sig
• Right i/p junction block (in right end of dash)
• Rotary position sens sig
• Ser data
• Shift motor
• Sw sig
• Tan
• Tan a
• Tan c
• Trans ig1 fuse 19 fuse 13 15a
• Transfer case 2/4 wheel drive actuator position sensor (on transfer case)
• Transfer case encoder motor
• Transfer case shift control module (lower left side of dash)
• Transfer case shift control switch (on top left of transfer case)
• Trec fuse 67 fuse 62 30a
• Underhood fuse block (left side of engine compt)
• Wheel heater)
• Windshield outside moisture sensor (near inside rearview mirror mount)
• X109
• X110

WARNING SYSTEMS

Warning Systems Wiring Diagram, with Bucket Seats & Power Mirrors (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Warning Systems Wiring Diagram, with Bucket Seats & Power Mirrors (1 of 2) for GMC Sierra HD 2012 2500:

• (upper left corner of dash)
• (upper left corner of dash) g201
• 3a5
• Auto
• B5 x109
• Battery (+)
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Ctsy fuse 5 15a
• Dim fuse 7 15a
• Driver door latch assembly (rear of driver's door)
• Drv dr key sw sig
• Except hybrid
• G103 (on front of right cylinder head)
• G201
• G201 (upper left corner of dash)
• G303 (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• Ground
• Head
• Headlamp & panel dimmer switch
• Headlp sw headlp off sig
• Headlp sw headlp on sig
• Headlp sw park lamps sig
• Hi spd gmlan bus (+)
• Hi spd gmlan bus (-)
• Hot at all times
• Hybrid
• I/p fuse block (left side of dash)
• Ign
• Is lps fuse 17 20a
• J201
• J502 (w/ power windows)
• J602 (w/ power door lock control)
• Left front door ajar sw
• Left rear door ajar sw
• Left rear door latch assembly (rear of left rear door)
• Lo spd gmlan serial data
• Lt stop trn fuse 6 15a
• Off
• Park
• Park brake sw signal
• Passenger door latch assembly (rear of passenger's door)
• Power
• Right front door ajar sw
• Right i/p junction block (in right end of dash)
• Right rear door ajar sw
• Right rear door latch assembly (rear of right rear door)
• Rt stop trn fuse 8 15a
• Stop lamps fuse 12 15a
• System distribution
• Tan
• W/ electronic door lock control
• W/o electronic door lock control
• X202
• X501
• X700
• X800

Warning Systems Wiring Diagram, with Bucket Seats & Power Mirrors (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Warning Systems Wiring Diagram, with Bucket Seats & Power Mirrors (2 of 2) for GMC Sierra HD 2012 2500:

• (in instrument panel harness, 19 cm after radio connector breakout) (w/ luxury edition) j204
• (lower left side of dash) left i/p junction block
• (on brake master cylinder reservoir) brake fluid level switch
• (w/ front bench seat)
• (w/ front bench seat) x202
• (w/o luxury edition)
• Acc
• B13
• Brake ind
• Chime module (center of dash, behind radio)
• Diesel
• Dlis fuse 35 fuse 32 2a
• Driver information center (dic) display
• Driver seat belt buckle
• Driver seat belt switch
• G201 (upper left corner of dash)
• G301 (below left side of passenger's seat)
• Gasoline
• Hot at all times
• Ignition switch
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Instrument panel cluster (ipc)
• Ipc fuse 46 fuse 43 10a
• J212
• J305 (w/ 10 series) (in driver seat harness, 5 cm from x303)
• Key-in ignition switch
• Left i/p junction block (lower left side of dash)
• Left seat belt sw x2
• Lo spd data
• Lo spd gmlan serial data x1
• Logic
• Low engine oil pressure ind
• Low ref
• Low tire pressure ind
• Nca
• Off
• Park brake switch (on park brake pedal assembly)
• Pnk
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Run
• Seat belt ind
• Serial data
• Sound systems
• Splice pack jx221 (in i/p harness, behind left side of dash)
• Splice pack jx339 (under front passenger's seat)
• Start
• Underhood fuse block (left side of engine compt)
• W/ radio provisions
• W/o radio provisions
• X12
• X202
• X212
• X303

Warning Systems Wiring Diagram, without Bucket Seats & Power Mirrors (1 of 2) for GMC Sierra HD 2012 2500

List of elements for Warning Systems Wiring Diagram, without Bucket Seats & Power Mirrors (1 of 2) for GMC Sierra HD 2012 2500:

• (upper left corner of dash)
• 3b1
• Auto
• Battery (+)
• Bcm fuse 15 10a
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Crew cab
• Ctsy fuse 5 15a
• Dim fuse 7 15a
• Driver door latch assembly (rear of driver's door)
• Driver door lock/ window switch
• G103 (on front of right cylinder head)
• G201
• G201 (upper left corner of dash)
• G303 (on lower left "b" pillar)
• G304 (on lower right "b" pillar)
• Ground
• Head
• Headlamp & panel dimmer switch
• Headlp sw headlp off sig
• Headlp sw headlp on sig
• Headlp sw park lamps sig
• Hi spd gmlan bus (+)
• Hi spd gmlan bus (-)
• Hot at all times
• I/p fuse block (left side
• Ign
• Is lps fuse 17 10a
• J201
• Left rear door ajar sw
• Left rear door latch assembly (rear of left rear door)
• Lf ajar sig
• Lf open sig
• Lo spd data
• Lo spd gmlan serial data
• Low ref
• Lt stop trn fuse 6 15a
• M x800
• Of dash)
• Off
• Park
• Park brake sw signal
• Passenger door latch assembly (rear of passenger's door)
• Passenger door lock/ window switch
• Power distribution system
• Rf ajar sig
• Right i/p junction block (in right end of dash)
• Right rear door ajar sw
• Right rear door latch assembly (rear of right rear door)
• Rt stop trn fuse 8 15a
• Stop lamps fuse 12 15a
• Tan
• X109 b5
• X700
• X700 m
• X800

Warning Systems Wiring Diagram, without Bucket Seats & Power Mirrors (2 of 2) for GMC Sierra HD 2012 2500

List of elements for Warning Systems Wiring Diagram, without Bucket Seats & Power Mirrors (2 of 2) for GMC Sierra HD 2012 2500:

• (in instrument panel harness,19 cm after radio connector breakout) (w/ luxury edition) j204
• (on brake master cylinder reservoir) brake fluid level switch
• (w/ front bench seat) x202
• (w/o luxury edition)
• A15
• Acc
• B13
• Brake ind
• Chime module (center of dash, behind radio)
• Diesel
• Dlis fuse 35 fuse 32 2a
• Driver information center (dic) display
• Driver seat belt buckle
• Driver seat belt switch
• G201 (upper left corner of dash)
• G301 (below left side of passenger's seat)
• Gasoline
• Hot at all times
• Ignition switch
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat)
• Instrument panel cluster (ipc)
• Ipc fuse 46 fuse 43 10a
• J212
• J305 (w/ 10 series) (in driver seat harness, 5 cm from x303)
• Key-in ignition switch
• Left i/p junction block (lower left side of dash)
• Left seat belt sw x2
• Lo spd data
• Lo spd gmlan serial data x1
• Logic
• Low engine oil pressure ind
• Low ref
• Low tire pressure ind
• Nca
• Off
• Park brake switch (on park brake pedal assembly)
• Pnk
• Power distribution system
• Radio
• Rdo fuse 42 fuse 39 15a
• Run
• Seat belt ind
• Serial data
• Sound systems
• Splice pack jx221 (in i/p harness, behind left side of dash)
• Splice pack jx339 (under front passenger's seat)
• Start
• Underhood fuse block (left side of engine compt)
• W/ radio provisions
• W/o radio provisions
• X1 k2
• X12
• X212
• X303

WIPER/WASHER

Wiper/Washer Wiring Diagram for GMC Sierra HD 2012 2500

List of elements for Wiper/Washer Wiring Diagram for GMC Sierra HD 2012 2500:

• (not used)
• (on front of right cylinder head) (6.6l) g103
• (top left rear of engine) (4.3l) g107
• Bat pos volt
• Body control module (bcm) (lower left side of dash)
• Computer data lines system
• Driver information center (dic)
• Front washer diode
• Frt wash fuse 7 (except 6.6l) fuse 5 (6.6l) 15a
• Frt wash pcb relay
• Frt wpr fuse 36 (except 6.6l) wpr fuse 33 (6.6l) 25a
• G100 (6.6l: left front corner of engine compt) (except 6.6l: on lower left radiator support)
• G101 (6.6l: right front corner of engine compt) (except 6.6l: on lower right radiator support)
• G102 (4.8l, 5.3l, 6.0l & 6.2l) (on lower left front of engine)
• G201 (upper
• Ground distribution system
• Hot at all times
• I/p fuse block (left side of dash)
• Instrument panel cluster (ipc)
• Int
• J100
• J101
• J105
• J205
• Left corner of dash)
• Left i/p junction block (lower left x1 side of dash)
• Logic
• Low ref
• Low washer fluid ind ctrl
• Mist
• Mtr park sw sig
• Off
• Pnk
• Rt stop trn fuse 8 15a
• Serial data
• Tan
• Turn signal multi-function switch (on left side of steering column)
• Underhood fuse block (left side of engine compt)
• Washer rly ctrl
• Washer sw sig
• Washer switch
• Windshield washer fluid level switch (bottom of washer fluid reservoir)
• Windshield washer fluid pump (bottom of washer fluid reservoir)
• Windshield wiper motor (under left side of windshield cowl)
• Winshield wiper sw hi sig
• Wiper control pcb relay
• Wiper high speed diode
• Wiper low speed diode
• Wiper speed pcb relay
• Wiper sw hi sig
• Wiper sw lo sig
• Wiper switch
• Wndshld wiper sw sig 2
• X103
• X201