All Wiring Diagrams for GMC Cab & Chassis C2000 3500

AIR CONDITIONING

5.7L

5.7L VIN R, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (engine harn, near diode)
• 22 cm from ebcm breakout)
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse block)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c control
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Blower switch
• Diode
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Near egr valve breakout)
• Off
• Pnk
• S146 (eng harn, pnk
• S185
• S186
• S268 (i/p harn, behind center of dash)
• Sw sig
• Underhood fuse block
• Vehicle control module (left side of engine compt)

5.7L VIN R, Heater Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Heater Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind left
• (hvac harn, 8 cm from recirc door breakout) s244
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of dash) g202
• Air temp dr sensor
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G200
• Ground
• High blower relay (on top of front a/c- heater blower housing)
• Hot at all times
• Hot in run
• Htr-a/c fuse 12 25a
• Hvac control module
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (on front a/c-heater housing)
• Red
• S243 (hvac harn, 4 cm from recirc door breakout)
• S268 (i/p harness, behind center of dash)
• S298
• Side of dash)
• Tan
• Underhood fuse/relay center

5.7L VIN R, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (engine harn, near diode)
• (engine harness, 22 cm from ebcm breakout, 7.4l)
• (engine harness, near ebcm breakout)
• (engine harness, near egr valve breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5 cm from right headlamp breakout)
• (hvac harness, 4 cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, behind center of dash)
• (right side
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Diode
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• G112 (right front of engine compartment)
• G200 (behind left side of dash)
• G202
• Ground
• High blower relay (on top of front a/c-heater housing)
• Hot at all times
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Of dash)
• Off
• Pnk
• Rear defogger system
• Recirc door signal
• Recirculation door motor (on front a/c-heater housing)
• Red
• Relay ctrl
• S103
• S110
• S128
• S146
• S185
• S186
• S212 (i/p harn, behind center of dash)
• S243
• S244 (hvac harn, 8 cm from recirc door breakout)
• S268
• S298
• Sw sig
• Tan
• Underhood fuse block
• Vehicle control module (left side of engine compt)

6.5L

6.5L VIN F, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (engine harn, near diode)
• 30 cm from ebcm breakout)
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c control
• A/c disable
• A/c enable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c switch
• Blower switch
• Diode
• Fuse block
• G105 (right side of engine)
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign 1 fuse 10a
• Ignition
• Off
• Pnk
• Powertrain control module (behind right side of dash)
• Recirc signal
• Recirculation door motor (on a/c-heater housing)
• S185
• S186
• S268 (i/p harn, behind center of dash)
• Underhood fuse block

6.5L VIN F, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind right
• (engine harn,
• (engine harn, near diode)
• (engine harness, near ebcm breakout)
• (hvac harness, 4 cm from recirc door breakout)
• (hvac harness, 8 cm from recirc door breakout)
• (i/p harn, 24 cm from cluster breakout)
• (i/p harness, behind center of dash)
• (right side of dash) g202
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse center)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c ctrl
• A/c disable
• A/c enable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c switch
• Air temp dr signal
• Battery
• Block
• Blower fuse 3 50a
• Blower motor
• Blower resistor (under right side of dash, on heater housing)
• Blower switch
• Defogger element
• Diode
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse
• Fuse block
• G105 (right side of engine)
• G200 (behind left side of dash)
• Ground
• Heater and a/c control module
• High blower relay (under dash on top of heater-a/c housing)
• Hot at all times
• Hot in run
• Hot in run or start
• Htr-a/c fuse 12 25a
• Ign e fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Near diode)
• Off
• Pnk
• Powertrain control module
• Rear defogger system
• Recirc signal
• Recirculation door motor (under dash on heater- a/c housing)
• Red
• S107 (engine harn, 30 cm from breakout to ebcm)
• S110
• S185
• S186
• S212 (i/p harn, behind center of dash)
• S243
• S244
• S268
• S298
• Side of dash)
• Tan
• Underhood

7.4L

7.4L VIN J, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Compressor Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (engine harn, near diode)
• 22 cm from ebcm breakout)
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse block)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c control
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Blower switch
• Diode
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Near egr valve breakout)
• Off
• Pnk
• S146 (eng harn, pnk
• S185
• S186
• S268 (i/p harn, behind center of dash)
• Sw sig
• Underhood fuse block
• Vehicle control module (left side of engine compt)

7.4L VIN J, Heater Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Heater Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind left
• (hvac harn, 8 cm from recirc door breakout) s244
• (i/p harn, 24 cm from i/p cluster breakout)
• (right side of dash) g202
• Air temp dr sensor
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G200
• Ground
• High blower relay (on top of front a/c- heater blower housing)
• Hot at all times
• Hot in run
• Htr-a/c fuse 12 25a
• Hvac control module
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Off
• Rear defogger system
• Recirc ctrl
• Recirculation door motor (on front a/c-heater housing)
• Red
• S243 (hvac harn, 4 cm from recirc door breakout)
• S268 (i/p harness, behind center of dash)
• S298
• Side of dash)
• Tan
• Underhood fuse/relay center

7.4L VIN J, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Manual A/C Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (engine harn, near diode)
• (engine harness, 22 cm from ebcm breakout, 7.4l)
• (engine harness, near ebcm breakout)
• (engine harness, near egr valve breakout)
• (exc 4.3 l)
• (fwd lamps harn, 5 cm from right headlamp breakout)
• (hvac harness, 4 cm from recirc door breakout)
• (i/p harn, 28 cm from cluster breakout)
• (i/p harness, behind center of dash)
• (right side
• A/c comp fuse 10a
• A/c compressor clutch
• A/c compressor clutch relay (in underhood fuse/relay center)
• A/c compressor cycling switch (in low pressure line, on accumulator)
• A/c ctrl
• A/c disable
• A/c high pressure cutout switch (on a/c compressor)
• A/c low pressure cutout switch (on a/c compressor)
• A/c req
• A/c switch
• Air temp dr sensor
• Aux fan fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay (exc 4.3l) (in underhood fuse/relay center)
• Battery
• Blower fuse 3 50a
• Blower motor (under right side of dash)
• Blower resistor (on blower motor housing)
• Blower switch
• Defogger element
• Diode
• Front mode door motor (on front a/c-heater housing)
• Front temperature door motor (on front a/c-heater housing)
• Fuse block
• G104 (top right side of cylinder head)
• G105 (right side of engine)
• G112 (right front of engine compartment)
• G200 (behind left side of dash)
• G202
• Ground
• High blower relay (on top of front a/c-heater housing)
• Hot at all times
• Hot in run
• Hot in run or start
• Htr a/c fuse 12 25a
• Hvac control module
• Ign e fuse 10a
• Ignition
• Illumination
• Interior lights system
• Mode signal
• Of dash)
• Off
• Pnk
• Rear defogger system
• Recirc door signal
• Recirculation door motor (on front a/c-heater housing)
• Red
• Relay ctrl
• S103
• S110
• S128
• S146
• S185
• S186
• S212 (i/p harn, behind center of dash)
• S243
• S244 (hvac harn, 8 cm from recirc door breakout)
• S268
• S298
• Sw sig
• Tan
• Underhood fuse block
• Vehicle control module (left side of engine compt)

ANTI-LOCK BRAKES

5.7L

5.7L VIN R, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500:

• (engine harn, near ebcm breakout) s111
• (selectable 4wd harn, near breakout to transfer case relay)
• 4wd sw input
• Abs fuse 60a
• Abs ind
• Abs ind ground
• Battery
• Brake fuse 18 10a
• Brake ind
• Brake ind input
• Brake lamp ind out
• Brake pressure warning switch (underside of ebcm)
• Brake sw input
• Brake sw output
• Data link connector (dlc) (left of steering column)
• Daytime running lamp (drl) module (behind left side of dash)
• Ebcm ground
• Electronic brake control module (left side of engine compt)
• Electronic variable orifice (evo)/ passlock control module (under center of dash)
• Engine controls system
• Front axle actuator (on right rear of front drive axle)
• Fuse/relay block (left rear of engine compt)
• G119 (right front of eng block)
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition
• Instrument cluster
• Left front wheel speed sensor
• M/t
• Pnk
• Pump motor ground
• Red
• Right front wheel speed sensor
• S107
• S147
• S150 (engine harn, approx 13 cm from ebcm breakout)
• S151
• S152
• S213
• S280 (i/p harn, approx 5 cm from dlc breakout)
• S314
• Sensor high
• Sensor low
• Serial data
• Serial data line
• Stoplamp switch (top of brake pedal)
• Tan
• Transfer case control module (on steering column support bracket)
• Transmissions system
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (vss) (left side of transmission/ transfer case)
• Vehicle speed sig
• Vss (+)
• Vss (-)
• Vss sig

6.5L

6.5L VIN F, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500:

• (behind right side of dash) vehicle speed sensor buffer
• 4wd sw input
• Abs fuse 60a
• Abs ind
• Abs ind ground
• Battery
• Brake fuse 18 10a
• Brake ind
• Brake ind input
• Brake lamp ind out
• Brake pressure warning switch (underside of ebcm)
• Brake sw input
• Data link connector (dlc) (left of steering column)
• Daytime running lamp (drl) module (behind left side of dash)
• Ebcm ground
• Electronic brake control module (left side of engine compt)
• Electronic variable orifice (evo)/ passlock control module (under center of dash)
• Engine controls system
• Front axle actuator (on right rear of front drive axle)
• Fuse/relay block (left rear of engine compt)
• G119 (right front of eng block)
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition
• Instrument cluster
• Left front wheel speed sensor
• M/t
• Pnk
• Powertrain control module (pcm) (behind right side of dash)
• Pump motor ground
• Red
• Right front wheel speed sensor
• S107
• S150 (engine harn, approx 13 cm from ebcm breakout)
• S151
• S152
• S213
• S280 (i/p harn, approx 5 cm from dlc breakout)
• S314 (selectable 4wd harn, near breakout to transfer case relay)
• Sensor high
• Sensor low
• Serial data
• Serial data line
• Stoplamp switch (top of brake pedal)
• Tan
• Transfer case control module (on steering column support bracket)
• Transmissions system
• Vss out
• Vss sig

7.4L

7.4L VIN J, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Anti-lock Brake Wiring Diagrams for GMC Cab & Chassis C2000 3500:

• (engine harn, near ebcm breakout) s111
• (selectable 4wd harn, near breakout to transfer case relay)
• 4wd sw input
• Abs fuse 60a
• Abs ind
• Abs ind ground
• Battery
• Brake fuse 18 10a
• Brake ind
• Brake ind input
• Brake lamp ind out
• Brake pressure warning switch (underside of ebcm)
• Brake sw input
• Brake sw output
• Data link connector (dlc) (left of steering column)
• Daytime running lamp (drl) module (behind left side of dash)
• Ebcm ground
• Electronic brake control module (left side of engine compt)
• Electronic variable orifice (evo)/ passlock control module (under center of dash)
• Engine controls system
• Front axle actuator (on right rear of front drive axle)
• Fuse/relay block (left rear of engine compt)
• G119 (right front of eng block)
• Gauges fuse 4 10a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition
• Instrument cluster
• Left front wheel speed sensor
• M/t
• Pnk
• Pump motor ground
• Red
• Right front wheel speed sensor
• S107
• S147
• S150 (engine harn, approx 13 cm from ebcm breakout)
• S151
• S152
• S213
• S280 (i/p harn, approx 5 cm from dlc breakout)
• S314
• Sensor high
• Sensor low
• Serial data
• Serial data line
• Stoplamp switch (top of brake pedal)
• Tan
• Transfer case control module (on steering column support bracket)
• Transmissions system
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (vss) (left side of transmission/ transfer case)
• Vehicle speed sig
• Vss (+)
• Vss (-)
• Vss sig

ANTI-THEFT

Forced Entry Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Forced Entry Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (right side of dash) g201
• Body control module (in center console)
• C16
• Cargo door jamb switch
• Ctsy fuse 3 20a
• D11
• D12
• D13
• D14
• Door lock
• Door lock inversion module (behind left side of dash)
• Door unlock
• Ex lights ctrl
• G201 (right side of dash)
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• Grd
• Hatch ajar sw
• Headlight system
• Horn rly ctrl
• Horns system
• Hot at all times
• I/p fuse block
• Left front door jamb switch
• Left rear door jamb switch
• Lf dr ajar sw
• Liftgate jamb switch
• Rf dr ajar sw
• Right front door jamb switch
• Right rear door jamb switch
• S204
• S218
• S262 (crossbody harn, approx 22 cm from seat belt breakout)
• S330
• S335
• S336
• S410
• Sec led ctrl
• Security led (in center of floor console)
• Shock
• Shock sensor
• Shock sensor (in center console)
• Tamper
• Tan

Pass-Key Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Pass-Key Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (dash harn, 5 cm from dlc breakout) s280
• 12v ref
• 5 volt ref
• Capacitor 0.47mf
• Data link connector (under left side of dash)
• Electronic power steering system
• Engine controls system
• Evo sol fd
• Evo sol out
• Evo/passlock module (under center of dash)
• Filter (molded in steering column harness)
• G134 (diesel: front top of engine, gas: right top center of cylinder head)
• Gauges fuse 4 10a
• Grd
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ign
• Instrument cluster
• Nca
• Passlck sig
• Passlock sensor (internal to steering column)
• Passlock signal
• Pnk
• Resistor 10 ohms
• S213
• S215
• Sec ind out
• Security fuse 21 10a
• Security indicator
• Sens ret
• Sensor grd
• Serial data
• Steering handwheel speed sensor (sensor ground)
• Vss
• Whl pos sig

COMPUTER DATA LINES

Computer Data Lines for GMC Cab & Chassis C2000 3500

List of elements for Computer Data Lines for GMC Cab & Chassis C2000 3500:

• (diesel) g134 (front to of engine)
• (right front of eng, near thermostat housing) (gas) g131
• 13 cm from ebcm breakout)
• Automatic transfer case control module (behind left side of dash)
• Aux pwr fuse 7 25a
• Data clss
• Data clss 2
• Data link connector (dlc) (under left side of dash, left of steering column)
• Diag enable
• Diesel
• Electronic brake control module (ebcm) (on left side of engine compt)
• Electronic variable orifice/passlock control module (under center of dash)
• Except luxury
• G202 (behind left side of dash)
• Gasoline
• Hot at all times
• I/p fuse block
• Inflatable restraint sensing & diagnostic module (under driver's seat carpet)
• Powertrain control module (pcm) (behind right side of dash, near blower motor)
• Prog enable
• Radio
• Remote control door lock receiver (behind center of dash)
• S204
• S215
• S245
• S272
• S280 (dash harness, approx 5 cm from dlc breakout)
• S294
• Serial data
• Tan
• Transfer case control module (tccm) (under dash, on steering column support bracket)
• Uart data
• Vehicle control module (vcm) (on left side of engine compt)
• Vehicle interface unit

COOLING FAN

Cooling Fan Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Cooling Fan Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (fwd lamps harn, 5 cm from right headlamp breakout)
• (in underhood fuse/relay center)
• A/c comp fuse 10a
• Aux fan fuse 30a
• Auxiliary cooling fan motor
• Auxiliary cooling fan relay
• G112 (right front of engine compartment)
• Hot at all times
• Hot in run or start
• Red
• Relay ctrl
• S128
• Underhood fuse block
• Vehicle control module (left rear of engine compt)

CRUISE CONTROL

5.7L

5.7L VIN R, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (i/p harn, 20 cm from heater/ a/c breakout) s222
• (i/p harn, left rear of engine compt)
• A/t
• A12
• A13
• A14
• A15
• Brake fuse 18 10a
• Clutch pedal position switch (top of clutch pedal)
• Cruise control module (left rear of engine compartment)
• Cruise control switch
• Cruise engage input
• Cruise fuse 6 10a
• Cruise on input
• Engine control system
• Exterior light system
• G119 (right front of engine, near thermostat housing)
• Ground
• Hot at all times
• Hot in run
• I/p fuse block (left side of dash)
• Ignition
• M/t
• Off
• R/a
• Resume/accel sig
• S/c
• S153
• S215
• S220 (i/p harness, 6 cm from steering column harness breakout)
• S221 (i/p harn, 20 cm from cluster breakout)
• S299
• Set/coast sig
• Shift inter- lock system
• Speed sensor input
• Speed sensor output
• Stop/haz fuse 1 20a
• Stoplamp or clutch sw input
• Stoplamp sw input
• Stoplamp switch (top of brake pedal)
• Vcm signal
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (vss) (left side of transmission)
• Vss high
• Vss low

6.5L

6.5L VIN F, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind right side of dash)
• (behind right side of dash) powertrain control module (pcm)
• (i/p harn, 6 cm from steering column breakout) s220
• A/t
• A11
• A12
• A13
• A14
• A15
• Antilock brake system
• B10
• B11
• Brake fuse 18 10a
• Clutch pedal position switch (top of clutch pedal)
• Cruise control switch
• Cruise fuse 6 10a
• Cruise on input
• D10
• Engine control system
• Exterior light system
• Hot at all times
• Hot in run
• I/p fuse block (under left side of dash)
• M/t
• Off
• R/a
• Resume/accel sig
• S/c
• S152 (eng harn, 4 cm from i/p harn breakout)
• S211
• S220
• S222 (i/p harn, 20 cm from inflatable restraint switch breakout)
• S299
• Set/coast sig
• Stop/haz fuse 1 20a
• Stoplamp switch (top of brake pedal)
• Stoplamp switch input
• Stoplamp/ clutch switch input
• Vehicle speed sensor (vss) (left side of transmission)
• Vehicle speed sensor buffer
• Vss high
• Vss input
• Vss low
• Vss output

7.4L

7.4L VIN J, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Cruise Control Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (i/p harn, 20 cm from heater/ a/c breakout) s222
• (i/p harn, left rear of engine compt)
• A/t
• A12
• A13
• A14
• A15
• Brake fuse 18 10a
• Clutch pedal position switch (top of clutch pedal)
• Cruise control module (left rear of engine compartment)
• Cruise control switch
• Cruise engage input
• Cruise fuse 6 10a
• Cruise on input
• Engine control system
• Exterior light system
• G119 (right front of engine, near thermostat housing)
• Ground
• Hot at all times
• Hot in run
• I/p fuse block (left side of dash)
• Ignition
• M/t
• Off
• R/a
• Resume/accel sig
• S/c
• S153
• S215
• S220 (i/p harness, 6 cm from steering column harness breakout)
• S221 (i/p harn, 20 cm from cluster breakout)
• S299
• Set/coast sig
• Shift inter- lock system
• Speed sensor input
• Speed sensor output
• Stop/haz fuse 1 20a
• Stoplamp or clutch sw input
• Stoplamp sw input
• Stoplamp switch (top of brake pedal)
• Vcm signal
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (vss) (left side of transmission)
• Vss high
• Vss low

DEFOGGERS

Defogger Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Defogger Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (w/ heated mirrors)
• C222
• Convenience center (under left side of dash)
• Fuse/relay block (left rear of engine compt)
• G201 (right side of dash)
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• G905 (right "c" pillar)
• Heated mirror relay (behind left side of dash, above support bracket)
• Hot in run
• Hot in run or start
• Htr-a/c fuse 12 25a
• Hvac control module (in center of dash)
• I/p fuse block (under left side of dash)
• Left cargo door contactor
• Left heated mirror
• Left power outside rear view mirror
• Left rear cargo door defogger grid
• Mirrors fuse 10a
• Pick-up w/ extended or crew cab
• Rear window defogger grid
• Rear window defogger switch
• Right cargo door contactor
• Right heated mirror
• Right rear cargo door defogger grid
• Rr-defog fuse 30a
• S218
• S223
• S251
• S259
• S268
• S410
• S425
• S506 (inside power outside rear view mirror harn., 7 cm from power outside rear view mirror)
• Solid state time delay relay
• Suburban/utility w/ liftgate
• Suburban/utility w/o liftgate

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Electronic Power Steering Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (front top of engine) g134 (2000)
• (i/p harness, approximately 40 cm from instrument cluster breakout)
• (i/p harness, approximately 5 cm from dlc breakout)
• (right front of engine) g119
• (right rear of engine)
• 5 volt ref
• Battery
• Data
• Data link connector (dlc) (under left side of dash, left of steering column)
• Diesel
• Electronic variable orifice (evo)/ passlock module (under center of dash)
• Evo feed
• Evo solenoid out
• G117 (1999)
• Gas
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition
• Pnk
• S213
• S215
• S221
• S280
• Security/strg fuse 21 20a
• Sensor return
• Steering assist control solenoid (part of power steering pump)
• Steering handwheel speed sensor (on steering column, near firewall)
• Steering wheel posit signal
• Sws posit sig
• Vehicle control module (on left side of engine compartment)
• Vehicle speed sensor buffer (behind right side of dash)
• Volt ref
• Vss sig out
• Vss signal input

ENGINE PERFORMANCE

5.7L

5.7L VIN K, Engine Performance Wiring Diagrams (1 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (1 of 6) for GMC Cab & Chassis C2000 3500:

• (attached to right rear of throttle body) idle air control (iac) valve
• (bottom front of engine near, crank pulley) crankshaft position sensor
• (eng harn, 13 cm from fuse/relay center)
• (eng harn, 13 cm from starter solenoid breakout)
• (eng harn, 20 cm from fuse/relay center)
• (eng harn, 6.5 cm from cps breakout)
• (eng harn, 6.5 cm from starter solenoid breakout)
• (engine harn, 17 cm from under- hood fuse/relay center nreakout)
• (top right side of engine) evaporative emission canister purge solenoid valve
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 3-2 shift sol ctrl
• A/t w/ 4wd
• Air pump rel ctrl
• Cam posit sens sig
• Camshaft position sensor (inside distributor)
• Crank posit sens sig
• Ect sens sig
• Egr posit sig
• Fuel gauge lvl
• Fuel tank press sens
• G119 (right front of engine block)
• Heated oxygen sensor (bank 1 sensor 1) (in left exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (bank 2 sensor 1) (in right exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (below 8600 gvw: bank 1 sensor 2) (left exhaust pipe, behind catalytic converter (over 8600 gvw: bank 2 sensor 2) (right exhaust pipe, behind catalytic converter)
• Ho2s low
• Ho2s sig
• Iat sens sig
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Inline gender adapter a
• Knock sens sig
• Knock sensor (ks) (right side of engine block, below exhaust manifold, forward of starter)
• Low ref
• Map sens input
• Mass air flow sens sig
• Nca
• Others
• Pnk
• Pnk c ignition feed
• S012
• S013
• S016
• S021
• S022
• S031
• S148
• S149
• S162
• Sens rtn
• Sens sig
• Sensor return
• Tan
• Tcc pwm sol ctrl
• Tcc sol ctrl
• Temp sens input
• Throttle posit sens
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd)
• Vent ctlr
• Vss sig
• Vss signal

5.7L VIN K, Engine Performance Wiring Diagrams (2 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (2 of 6) for GMC Cab & Chassis C2000 3500:

• (eng harn, 14 cm from thermostat ground stud breakout)
• (left front corner of eng compt) g100
• A 2-3 shift red
• A 3-2 shift solenoid
• A nca
• Air injection reaction pump motor (left front of eng compt)
• Air injection reaction pump relay (california) (underhood fuse/ relay center)
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Aux-b fuse 30a stud-b
• Ecm1 fuse 20a
• Eng1 k7
• Evaporative emissions (evap) canister vent valve (left side of engine compt)
• Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel inj 7
• Fuel inj 8
• Fuse 20a l8
• Heated oxygen sensor (below 8600 gvw: bank 2 sensor 2) (right exhaust pipe, behind catalytic converter) (over 8600 gvw: bank 1 sensor 2) (left exhaust pipe behind catalytic converter)
• Hot at all times
• Hot in run & start
• Nca
• Pnk
• Pnk a
• Pressure control solenoid valve
• Red
• S018
• S104 pnk a
• S108
• S161
• S166 (eng harn, 18 cm from ebcm breakout)
• S167
• Solenoid
• Solenoid check valve
• Tan
• Tcc solenoid
• Torque converter red clutch pulse width modulation solenoid
• Trans fluid temperature sensor
• Under hood fuse/relay center

5.7L VIN K, Engine Performance Wiring Diagrams (3 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (3 of 6) for GMC Cab & Chassis C2000 3500:

• (af harness, 10 cm from hpl conn)
• (eng harn, 10 cm from thermostat ground stud breakout)
• (eng harn, 13 cm from cps breakout)
• (eng harn, 4 cm from fuse/relay center)
• (eng harn, near underhood lamp conn breakout)
• (produc- tion use)
• +5v ref
• 1x cam sens
• 4x crank in
• Actual gas
• Af ecu bat
• Af ecu gnd
• Af ecu ign
• Alternative fuel engine control unit (left side of engine compt)
• C001
• C002
• Class 2 data
• Cng fuse 20a
• Ect input
• Egr sens
• F pmp rly
• Fps +5v
• Fps sig
• Fps/fts gnd
• Fts sig
• Fuel lev out
• Fuel pressure sensor (end of cng fuel tank)
• Fuel temperature sensor (end of cng fuel tank)
• G119 (right front of engine)
• Gas flow out
• Gauge sel sw
• Hi pres lo
• Ho2s in
• Hot at all times
• Hot in run, bulb test and start
• Iat input
• Ign e fuse 10a
• Ind ctrl
• Low pres lo
• Maf input
• Map input
• Mil ctrl
• Mil out
• Ngo enable
• Pnk
• Red
• Relay ctrl
• S001
• S002
• S009
• S014
• S015
• S017
• S019
• S020
• S399
• Sensor gnd
• Serial data
• Tan
• Tp sensor
• Under hood fuse/relay center
• Vss input

5.7L VIN K, Engine Performance Wiring Diagrams (4 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (4 of 6) for GMC Cab & Chassis C2000 3500:

• (af harn, 32.5 cm from relay breakout)
• (af harn, near lpl breakout)
• Af d1 (af harn 10 cm from hpl conn)
• Af d2 (af harn 10 cm from lpl conn)
• Af fuel pump relay (left of engine compt)
• Fuel gauge relay (left of engine compt)
• Fuel gauge select switch
• G119 (right front of engine)
• Gas mass sensor (right front of engine)
• High pressure lock-off solenoid (end of cng fuel tank)
• Ignition relay (left of engine compt)
• Interior lights system
• Lock-off relay (left of engine compt)
• Low pressure lock-off solenoid (right middle of engine)
• Mixture control valve motor (right front of engine)
• Nca
• Pnk
• Red
• S003 (af harn, 22.5 cm from relay breakout)
• S004
• S005 (af harn, 13 cm from conn breakout)
• S009
• S010
• S011
• S398 (af harn, near breakout to hpl conn)
• S399
• Tan

5.7L VIN K, Engine Performance Wiring Diagrams (5 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (5 of 6) for GMC Cab & Chassis C2000 3500:

• (eng harn, approx 17 cm from breakout to egr valve) s106
• (eng harn, hd: 10 cm from egr valve breakout, ld: 27 cm from egr valve breakout)
• (engine harn, approx 16 cm from breakout to egr valve)
• (inside left frame rail, near rear crossmember)
• (right rear of cylinder head) g117
• (taillamp extension harn, 6 cm from the fuel pump harn breakout)
• Automatic transmission input shaft speed sensor (left side of transmission)
• C100
• C223
• Convenience center (under left side of dash)
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• Fuel gauge input
• Fuel pump & sender (in fuel tank)
• Fuel tank pressure sensor (in fuel tank)
• G415
• Gauges fuse 4 10a
• Grd
• Hot in off, run or start
• Hot in run or start
• I/p fuse block
• Ign
• Instrument cluster
• Intake air temperature sensor (in air intake duct)
• M/t only
• Manifold absolute pressure (map) sensor (top right of engine, near fuel injectors)
• Mass airflow sensor (in air intake duct)
• Pnk
• Red
• S103
• S131
• S213
• S231
• S232
• S430
• Service engine soon indicator
• Sig
• Speedometer input
• Tachometer input
• Tan
• Tan a
• Throttle position sensor (on throttle body assembly)
• Trans fuse 20 10a
• Upshift lamp
• W/o dual fuel tank

5.7L VIN K, Engine Performance Wiring Diagrams (6 of 6) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, Engine Performance Wiring Diagrams (6 of 6) for GMC Cab & Chassis C2000 3500:

• (engine harness, approx 13 cm from ebcm breakout) s150
• (engine harness, approx 7 cm from ebcm breakout)
• (i/p harn, 20 cm from inflatable restraint switch breakout)
• (i/p harn, harness, 13 cm from left engine grommet)
• (i/p harness, approx 40 cm from instrument cluster breakout)
• (or
• (right rear of cylinder head) g120
• 4wd input
• 5v ref voltage
• 87a
• A pnk
• A/c comp enable rel
• A/c request signal
• A/t
• Air conditioning system
• Air inlet vlv mtr ctlr
• Automatic 4wd
• Automatic transfer case shift controller
• Aux fan relay
• Brake sw input
• Brake switch input
• Check eng lp ctrl
• Clutch pedal position (cpp) switch (at top of clutch pedal bracket)
• Cooling fans system
• Cpp sw input
• Cruise control module (left rear of engine compt, on firewall)
• Cruise ctrl sig eng
• Data link connector (under left side of dash, left side of steering column)
• Distributor
• Egr vlv feed
• Egr vlv ground
• Electronic brake control module (ebcm) (on left side of engine compt)
• Electronic variable orifice/ passlock control module (center of dash)
• Est output sig
• Evap can purge vlv
• F11 ecmb fuse 20a
• Force motor feed
• Force motor return
• Four whl dr sig
• Four whl dr sig lo
• Fuel level input
• Fuel pump a prime connector (left rear of eng compt)
• Fuel pump relay
• Fuel pump rly ctrl
• G117 (right rear of cylinder head)
• G12
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I/p fuse block
• Ign coil out
• Ign input
• Ign timing sig.
• Ignition
• Ignition coil (top right rear of engine)
• Ignition control module (right side rear of engine)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Manual or selectable 4wd
• Ngo input
• Pnk
• Pressure switch input
• Radio
• Red
• S101
• S103
• S111 (engine harness, approx 10 cm from ebcm breakout)
• S151
• S152
• S153
• S221
• Sensor ground
• Sensor return
• Serial data sig
• Shift ind lp out
• Speed sensor
• Speed sensor input
• Stoplamp switch (top of brake pedal)
• Stoplamp/ clutch switch input
• Switch signal
• Trans input speed rtn
• Trans input speed sig
• Transfer case control module (under dash, on steering column support bracket)
• Transfer case switch (left top of transfer case)
• Transmissions system
• Underhood fuse/ relay center
• Vcm sig
• Vehicle control module (vcm) (left side of engine compt)
• Vss input
• Vss sig out

5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500:

• (attached to right rear of throttle body) idle air control (iac) valve
• (bottom front of engine near, crank pulley) crankshaft position sensor
• (top right side of engine) evaporative emission canister purge solenoid valve
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 3-2 shift sol ctrl
• A/t w/ 4wd
• Air pump rel ctrl
• Cam posit sens sig
• Camshaft position sensor (inside distributor)
• Crank posit sens sig
• Ect sens sig
• Egr posit sig
• Fuel gauge lvl
• Fuel tank press sens
• G119 (right front of engine block)
• Heated oxygen sensor (bank 1 sensor 1) (in left exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (bank 2 sensor 1) (in right exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (below 8600 gvw: bank 1 sensor 2) (left exhaust pipe, behind catalytic converter (over 8600 gvw: bank 2 sensor 2) (right exhaust pipe, behind catalytic converter)
• Ho2s low
• Ho2s sig
• Iat sens sig
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Inline gender adapter a
• Knock sens sig
• Knock sensor (ks) (right side of engine block, below exhaust manifold, forward of starter)
• Low ref
• Map sens input
• Mass air flow sens sig
• Nca
• Others
• Pnk
• Pnk c ignition feed
• Pnk pnk
• S148
• S149
• S162
• Sens rtn
• Sens sig
• Sensor return
• Tan
• Tcc pwm sol ctrl
• Tcc sol ctrl
• Temp sens input
• Throttle posit sens
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd)
• Vent ctlr
• Vss sig
• Vss signal

5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500:

• (left front corner of eng compt) g100
• A 2-3 shift red
• A 3-2 shift solenoid
• A nca
• Air injection reaction pump motor (left front of eng compt)
• Air injection reaction pump relay (california) (underhood fuse/ relay center)
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Aux-b fuse 30a stud-b
• Ecm1 fuse 20a
• Eng1 k7
• Evaporative emissions (evap) canister vent valve (left side of engine compt)
• Exhaust gas recirculation (egr) valve (front of engine near thermostat housing)
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel inj 7
• Fuel inj 8
• Fuse 20a l8
• Heated oxygen sensor (below 8600 gvw: bank 2 sensor 2) (right exhaust pipe, behind catalytic converter) (over 8600 gvw: bank 1 sensor 2) (left exhaust pipe behind catalytic converter)
• Hot at all times
• Hot in run & start
• Nca
• Pnk
• Pnk pnk pnk tan red
• Pressure control solenoid valve
• Red
• S104
• S108
• S161
• S166 (eng harn, 18 cm from ebcm breakout)
• S167
• Solenoid
• Solenoid check valve
• Tan
• Tcc solenoid
• Torque converter red clutch pulse width modulation solenoid
• Trans fluid temperature sensor
• Under hood fuse/relay center

5.7L VIN R, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500:

• (eng harn, approx 17 cm from breakout to egr valve) s106
• (eng harn, hd: 10 cm from egr valve breakout, ld: 27 cm from egr valve breakout)
• (engine harn, approx 16 cm from breakout to egr valve)
• (inside left frame rail, near rear crossmember)
• (right rear of cylinder head) g117
• (taillamp extension harn, 6 cm from the fuel pump harn breakout)
• Automatic transmission input shaft speed sensor (left side of transmission)
• C100
• C223
• Convenience center (under left side of dash)
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• Fuel gauge input
• Fuel pump & sender (in fuel tank)
• Fuel tank pressure sensor (in fuel tank)
• G415
• Gauges fuse 4 10a
• Grd
• Hot in off, run or start
• Hot in run or start
• I/p fuse block
• Ign
• Input
• Instrument cluster
• Intake air temperature sensor (in air intake duct)
• M/t only
• Manifold absolute pressure (map) sensor (top right of engine, near fuel injectors)
• Mass airflow sensor (in air intake duct)
• Pnk
• Pnk pnk tan red
• S103
• S213
• S231
• S232
• S430
• Service engine soon indicator
• Sig
• Speedometer input
• Tachometer
• Tan a
• Throttle position sensor (on throttle body assembly)
• Trans fuse 20 10a
• Upshift lamp
• W/o dual fuel tank

5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500:

• (engine harness, approx 13 cm from s150
• (engine harness, approx 7 cm from ebcm breakout)
• (i/p harn, 20 cm from inflatable restraint switch breakout)
• (i/p harn, harness, 13 cm from left engine grommet)
• (i/p harness, approx 40 cm from instrument cluster breakout)
• (or
• (right rear of cylinder head) g120
• 4wd input
• 5v ref voltage
• 87a
• A pnk
• A/c comp enable rel
• A/c request signal
• A/t
• Air conditioning system
• Air inlet vlv mtr ctlr
• Automatic 4wd
• Automatic transfer case shift controller
• Aux fan relay
• Brake sw input
• Brake switch input
• Check eng lp ctrl
• Clutch pedal position (cpp) switch (at top of clutch pedal bracket)
• Cooling fans system
• Cpp sw input
• Cruise control module (left rear of engine compt, on firewall)
• Cruise ctrl sig eng
• Data link connector (under left side of dash, left side of steering column)
• Distributor
• Ebcm breakout)
• Egr vlv feed
• Egr vlv ground
• Electronic brake control module (ebcm) (on left side of engine compt)
• Electronic variable orifice/ passlock control module (center of dash)
• Est output sig
• Evap can purge vlv
• F11 ecmb fuse 20a
• Force motor feed
• Force motor return
• Four whl dr sig
• Four whl dr sig lo
• Fuel level input
• Fuel pump a prime connector (left rear of eng compt)
• Fuel pump relay
• Fuel pump rly ctrl
• G117 (right rear of cylinder head)
• G12
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I/p fuse block
• Ign coil out
• Ign input
• Ign timing sig.
• Ignition
• Ignition coil (top right rear of engine)
• Ignition control module (right side rear of engine)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Manual or selectable 4wd
• Pnk
• Pressure switch input
• Radio
• Red
• S101
• S103
• S111 (engine harness, approx 10 cm from ebcm breakout)
• S151
• S152
• S153
• S221
• Sensor ground
• Sensor return
• Serial data sig
• Shift ind lp out
• Speed sensor
• Speed sensor input
• Stoplamp switch (top of brake pedal)
• Stoplamp/ clutch switch input
• Switch signal
• Trans input speed rtn
• Trans input speed sig
• Transfer case control module (under dash, on steering column support bracket)
• Transfer case switch (left top of transfer case)
• Transmissions system
• Underhood fuse/ relay center
• Vcm sig
• Vehicle control module (vcm) (left side of engine compt)
• Vss input
• Vss sig out

6.5L

6.5L VIN F, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500:

• (bottom front of engine, near crank pulley) crankshaft position (ckp) sensor
• (engine harn, 31 cm from taillamp harn breakout)
• (i/p harn, approx 16 cm into i/p cluster breakout)
• (top center of engine) boost pressure sensor
• (top of engine, near
• (top rear of right cylinder head) g117
• (top right front of engine, near thermostat housing) engine coolant temperature (ect) sensor
• 4wd signal
• 5 volt ref
• 5 vref
• 5v ref volt
• A 1-2 red shift sol
• A 2-3 red shift sol
• A torque red converter clutch pulse wdth mod sol
• A/c request sig
• A/c system
• A/t fluid pressure (tfp) manual valve position switch
• A/t w/ 4wd
• A10
• A11 3 mode cruise a12
• Anti-lock brakes system
• App 1 sig
• App 2 sig
• App 3 sig
• Automatic transmission
• Automatic transmission input shaft speed (a/t iss) sensor (left side of transmission)
• B10
• B11
• B12
• Brake sw in
• Brake switch input
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Cam posit sens sig rtn
• Camshaft posit sens
• Closure gnd
• Cruise control system
• Cruise ctrl sw engage
• Cruise eng sw retard
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Ect temp sens in
• Engine crank sens input
• Force mtr hi
• Force mtr low
• Fuel pump input
• Fuel pump rly ctrl
• Fuel sol closure (5v sig)
• Fuel temp sens (5v sig)
• Glow plug "wait" lp out
• Glow plug relay
• Ground
• Ign
• Inline gender adapter
• Intake air temperature (iat) sensor
• Intake man air temp sens
• Intake manifold
• Map sens input
• Nca
• Opening)
• Others
• Pnk
• Powertrain control module (pcm) (behind right side of dash, near blower motor)
• Pressure control solenoid valve
• Radio, evo/ passlock control module, transfer case control module
• Range mode sel a
• Range mode sel b
• Range mode sel c
• Red
• S140
• S170
• S199
• S211
• S215
• Sensor gnd
• Tan
• Timing stepper mtr (high)
• Timing stepper mtr (low)
• Transmission speed input
• Transmission temp input
• Transmission temperature sensor
• Transmissions system
• Vehicle speed input
• Vehicle speed sensor (left side of transmission)
• Vehicle speed sensor buffer (behind right side of dash)
• Vss hi
• Vss lo
• Vss output
• Vss rtn
• Vss sig

6.5L VIN F, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500:

• (a/t: eng harn, approx 4 cm from i/p harness breakout, m/t: i/p harn, 20 cm from inflatable restraint i/p module switch breakout)
• (on inj pump)
• 5 volt ref
• Accelerator pedal position (app) module (part of accelerator pedal)
• Clutch pedal position (cpp) switch (m/t only) (top of clutch pedal bracket)
• Cmp sig
• D2 trans fuse 20 20a e1
• D8 stop/haz fuse 1 20a c7
• Ecm-1 h7
• Electronic brake control module (on left side of engine compt)
• Engine shutoff solenoid (top of fuel injection pump)
• Fuel solenoid (rear of fuel injection pump)
• Fuel solenoid driver (left side of fuel injection pump)
• Fuse 20a
• High res sig
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block
• Injection timing stepper motor (top right front of engine)
• M4 brake fuse 18 10a n3
• Nca
• Optical fuel temperature sensor (on top of fuel injection pump)
• Pnk
• Pnk pnk
• Power distribution system
• Red
• S166
• S190
• S198
• S220 (i/p harness, approx 6 cm from steering column breakout)
• S222 (m/t) s152 (a/t)
• S299
• Sens grd
• Stop- lamp switch (on top of brake pedal)
• Tan d
• Underhood fuse/relay center

6.5L VIN F, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500:

• (inside left frame rail, below driver's door)
• (m/t: engine harness, approx 37 cm from breakout to ebcm, a/t: engine harness, approx 31 cm from taillamp harn breakout) s100
• (taillamp ext harn, 10 cm from fuel pump balance mod breakout)
• (top rear of right cylinder head)
• (top rear of right cylinder head) g117
• Auxiliary tank fuel level sensor
• Ecm-b fuse 20a
• F11
• Fuel balance pump
• Fuel gauge
• Fuel lift pump
• Fuel pump balance module (inside left side frame rail)
• Fuel pump balance relay (on fuel pump balance module)
• Fuel pump prime connector (left side of eng compt)
• Fuel pump relay (in under fuse- relay center)
• Fuel pump/oil pressure switch
• G117
• G12
• G415 (inside left frame rail, near rear crossmember)
• Gauges fuse 4 10a
• Hot at all times
• Hot in run or start
• I/p fuse block
• Ign--e fuse 10a
• Instrument cluster
• Instrument cluster system
• Nca
• Pnk
• Primary tank fuel level sensor
• Red
• S101
• S103
• S147
• S213
• S315
• S317
• S318
• S319
• Service engine soon indicator
• Service throttle soon indicator
• Tan
• Underhood fuse/relay center
• Vehicle speed input
• W/ dual tanks
• W/o dual tank
• Wait to start "glow plugs" indicator
• Water in fuel indicator
• Water in-fuel sensor (on fuel filter/ manager)

6.5L VIN F, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500:

• "serv eng soon" ind
• "serv throttle soon" ind
• (engine harness, approx 13 cm into ebcm breakout)
• (on fuel manager/filter) fuel heater
• 12v battery (fused)
• 12v battery fused
• 3/2 ctrl out
• A/c enable
• A/c system
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (dlc) (under left side of dash, left of steering column)
• Eng-i k7
• Engine shutoff sol out
• Fuel sol module (5 vref)
• Fuel sol module feed
• Fuse 20a
• Fusible link
• G117 (top rear of right cylinder head)
• Glow plug 1
• Glow plug 2
• Glow plug 3
• Glow plug 4
• Glow plug 5
• Glow plug 6
• Glow plug 7
• Glow plug 8
• Glow plug output
• Glow plug relay (top left rear of engine)
• Grd
• Hot at all times
• Hot in run or start
• Ign
• Ignition
• Nca
• Pcm gnd
• Pnk
• Powertrain control module (pcm) (behind right side of dash, near blower motor)
• Red
• Relay ctrl
• S103
• S108
• S137
• S138
• S147
• S150
• S191
• S269
• Serial data sig
• Shift sol a input
• Shift sol b input
• Tan
• Tps 2 ref voltage
• Underhood fuse/relay center
• Wait to start ind
• Wastegate sol
• Wastegate solenoid (top left rear of engine)

7.4L

7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for GMC Cab & Chassis C2000 3500:

• (19 cm into oxygen sensor harn)
• (attached to right rear of throttle body) idle air control (iac) valve
• (bottom front of engine near, crank pulley) crankshaft position sensor
• (top right side of engine) evaporative emission canister purge solenoid valve
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• A/t w/ 4wd
• Air pump rel ctrl
• Cam posit sens sig
• Camshaft position sensor (inside distributor)
• Crank posit sens sig
• Ect sens sig
• Egr posit sig
• Fuel gauge lvl
• Fuel level input
• Fuel tank press sens
• G119 (right front side of eng block)
• Heated oxygen sensor (bank 1 sensor 1) (in left exhaust pipe in front of catalytic converter)
• Heated oxygen sensor (bank 2 sensor 1) (in right exhaust pipe in front of catalytic converter)
• Heated oxygen sensor (bank 2 sensor 2) (in right exhaust pipe in back of catalytic converter) (california)
• Ho2s low
• Ho2s sig
• Iat sens sig
• Idle air ctrl (iac) a hi
• Idle air ctrl (iac) b lo
• Ign feed
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Inline gender adapter
• Knock sens sig
• Knock sensor (ks) (left) (left side of engine block, below exhaust manifold)
• Knock sensor (ks) (right) (right side of engine block, below exhaust manifold)
• Map sens input
• Mass air flow sens sig
• Nca
• Others
• Pnk
• Pnk c ignition feed
• Pnk pnk
• Pnk pnk pnk pnk
• S114
• S148
• S149
• S162
• Sens rtn
• Sens sig
• Sensor return
• Tan
• Tcc pwm sol ctrl
• Temp sens input
• Throttle posit sens
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd)
• Vent ctlr
• Vss rtn
• Vss sig
• Vss signal
• W/ dual fuel tanks

7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for GMC Cab & Chassis C2000 3500:

• 2-3 shift red
• Air injection reaction pump clutch (on front of air pump)
• Air injection reaction relay (underhood fuse/ relay center)
• Automatic transmission
• Automatic transmission fluid pressure (tfp) manual valve position switch
• Ecm1 fuse 20a
• Eng1 k7
• Evaporative emissions (evap) purge solenoid vacuum switch (on top of engine) (california)
• Exhaust gas recirculation (egr) valve (on top left side of eng)
• Fluid temperature sensor
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel inj 7
• Fuel inj 8
• Fuse 20a l8
• G119 (right front side of eng block)
• Heated oxygen sensor (bank 1 sensor 2) (in left exhaust pipe in back of catalytic converter) (california)
• Hot in run & start
• Nca
• Pnk
• Pnk pnk pnk pnk
• Pnk pnk pnk tan red
• Pressure control solenoid valve
• Red
• S104
• S108
• S147
• S154
• S155
• Solenoid
• Tan
• Torque convertor clutch pulse width modulation solenoid
• Underhood fuse/relay center

7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for GMC Cab & Chassis C2000 3500:

• (eng harn,
• (eng harn, approx 4 cm from egr valve breakout)
• (engine harn)
• (inside left frame rail, near rear crossmember)
• (inside left frame rail, near rear crossmember) g415
• (taillamp extension harness, approx 10 cm from fuel pump balance module breakout)
• 7 cm from egr valve breakout) s106
• Automatic transmission input shaft speed sensor (left side of transmission)
• Aux tank fuel lvl sig
• Auxiliary fuel tank level sensor (in fuel tank)
• Balance fuel pump (on inside left frame rail, near front of rear tank)
• Convenience center (under left side of dash)
• D w/ dual fuel tanks
• Engine coolant temperature sensor (top right front of engine, near thermostat housing)
• F7 ign e fuse 10a g8
• Fuel gauge input
• Fuel pump & sender (w/o dual fuel tanks) (in fuel tank)
• Fuel pump balance module (inside left side of frame rail)
• Fuel pump balance relay (on fuel pump balance module)
• Fuel pump module (w/ dual fuel tanks)
• Fuel tank pressure sensor (in fuel tank) (california)
• Fuel tanks
• G117 (back side of eng block, below right side of cylinder head)
• G415
• Gauges fuse 4 10a
• Ground
• Hot in off, run or start
• Hot in run or start
• I/p fuse block
• Ignition
• Instrument cluster
• Intake air temperature sensor (in air intake duct)
• Manifold absolute pressure (map) sensor (top right front of engine)
• Mass air- flow sensor (in air intake duct)
• Output to gauge c2
• Pnk
• Pnk a
• Pnk pnk tan red
• Primary tank fuel lvl sig
• Relay ctrl
• S103
• S146
• S213
• S231
• S232
• S315
• S318
• S319
• S324
• S430
• Service engine soon indicator
• Speedometer input
• Tachometer input
• Tan a
• Throttle position sensor (on throttle body assembly)
• Trans fuse 20 10a
• Underhood fuse/relay center
• W/ dual fuel tank
• W/ dual w/o dual fuel tank
• W/o dual fuel tank
• W/o dual fuel tanks

7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for GMC Cab & Chassis C2000 3500:

• (back side of eng block, below right side of cylinder head)
• (engine harness, approx 13 cm from s150
• (engine harness, approx 7 cm from ebcm breakout)
• (i/p harn, 13 cm from ccm)
• (i/p harn, 20 cm from inflatable restraint switch breakout)
• (i/p harness, approx 40 cm from instrument cluster breakout)
• (or
• 4wd input
• 5v ref voltage
• 87a
• A/c comp enable rel
• A/c request signal
• A/t
• Air conditioning system
• Air inlet vlv mtr ctlr
• Automatic 4wd
• Automatic transfer case controller
• Aux fan relay
• Brake sw input
• Brake switch input
• Check eng lp ctrl
• Clutch pedal position (cpp) switch (at top of clutch pedal bracket)
• Cooling fans system
• Cpp sw input
• Cruise control module (left rear of engine compt, on firewall)
• Cruise ctrl sig eng
• Data link connector (under left side of dash, left side of steering column)
• Distributor
• Dual fuel mod return
• Ebcm breakout)
• Egr vlv feed
• Egr vlv ground
• Electronic brake control module (ebcm) (on left side of engine compt)
• Electronic variable orifice/ passlock control module (center of dash)
• Est output sig
• Evap can purge vlv
• F11 ecmb fuse 20a
• Force motor feed
• Force motor return
• Four whl dr sig
• Four whl dr sig lo
• Fuel level input
• Fuel pump a prime connector (left rear of eng compt)
• Fuel pump relay
• Fuel pump rly ctrl
• G117
• G12
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I/p fuse block
• Ign coil out
• Ign input
• Ign timing sig.
• Ignition
• Ignition coil
• Ignition control module (on rear of intake manifold)
• Ignition feed
• M/t
• M4 brake fuse 18 10a n3
• Manual or selectable 4wd
• Pnk
• Pnk a
• Pressure switch input
• Radio
• Red
• S101
• S103
• S111 (engine harness, approx 7 cm from ebcm breakout)
• S151
• S152
• S153
• S221
• Sensor ground
• Sensor return
• Serial data sig
• Speed sensor
• Speed sensor input
• Stoplamp switch (top of brake pedal)
• Stoplamp/ clutch switch input
• Switch signal
• Trans input speed rtn
• Trans input speed sig
• Transfer case control module (under dash, on steering column support bracket)
• Transfer case switch (left top of transfer case)
• Transmissions system
• Underhood fuse/ relay center
• Vcm sig
• Vehicle control module (vcm) (left side of engine compt)
• Vss input
• Vss sig out

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Back-up Lamps Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (chassis cab) a c
• (ex chassis cab)
• (left side of transmission) back-up lamp switch
• A c
• A/t
• G415 (left frame rail, behind bumper)
• Hot in run or start
• I/p fuse block
• Left back-up lamp
• M/t
• Mirrors system (automatic day/night mirror)
• Pnk
• Right back-up lamp
• S411
• S414
• Trailer tow connector
• Transmission range switch (left side of transmission)
• Turn b/u fuse 16 20a

Exterior Lamps Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Exterior Lamps Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (dash harness behind left side of dash) s210
• (execpt suburban/ utility)
• (forward lamps harn, 35 cm from wiper harn breakout) s122
• (forward lamps harness, 5 cm from right headlamp breakout) s127
• (front to rear body harness, near chmsl harness breakout)
• (license lamp harness, near license lamp toward taillamp breakout) s415
• (rear lamps harn, 27 cm from trailer harness breakout) (w/ duel rear wheels) s413
• (tail- lamp harness, near taillamps extension harness break- out) s412
• Aux fuse 22 20a
• Auxiliary lead (taped to harness)
• Back-up lights circuit
• Cargo lamp
• Cargo lamp (2 bulbs)
• Cargo lamp switch
• Center high mount stop lamp
• Chmsl lamp (2 bulbs)
• Cruise control system
• Ctsy fuse 20a
• Fuse block
• G108 (left radiator support, near left headlamp)
• G119 (right front of engine block)
• G1o1 (right front side of engine compt)
• G201 (right side of dash)
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• G415 (left frame rail, behind bumper)
• H9 turn pwr h8 haz pwr h7 flshr out g8 gnd
• Hazard
• Headlamp & panel dimmer switch
• Headlights system
• Hot at all times
• Hot in run, bulb test or start
• I/p fuse block
• Instru- ment cluster
• Interior lights system
• Left
• Left front marker lamp
• Left front park/ turn lamps
• Left spotlamp assembly (police package)
• Left tail/ stop/ turn lamp
• Left turn indic
• License lamp
• License lamps
• Maxi fuse 30a
• Nca
• Normal
• Off
• Park
• Park lps fuse 9 20a
• Pickup
• Pnk
• Police package (1999 only)
• Rear clearance lamps circuit
• Red
• Rheo- stat
• Right
• Right front marker lamp
• Right front park/ turn lamps
• Right spotlamp assembly (police package)
• Right tail/ stop/ turn lamp
• Right turn indic
• Roof marker lamps
• S107
• S119 (forward lamps harn, 16 cm from wiper harn breakout)
• S123
• S128
• S204
• S215
• S220 (dash harn, 6 cm from column harness breakout)
• S242
• S259
• S283 (spotlamp ext harness)
• S299
• S316
• S411
• S416
• S419
• S421 (tail/stop lamp harness, 7 cm from g415)
• S422 (tail/stop lamp harn, 7 cm from trailer harness breakout)
• S424
• Stop- lamp relay (except subur- ban/ utility)
• Stop/ haz fuse 1 20a
• Stoplamp switch (top of brake pedal)
• Suburban/ utility
• Trailer tow connector
• Turn- b/u fuse 16 15a
• Turn/ hazard switch
• Turn/hazard flasher (on convenience center)
• Under- hood fuse relay center (left rear of engine compt)
• Under- hood fuse- relay center (left rear of engine compt)
• W/ dual rear wheels
• W/ step bumper
• W/o step bumper

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis C2000 3500

List of elements for Ground Distribution Wiring Diagram (1 of 4) for GMC Cab & Chassis C2000 3500:

• (i/p harness, approx 24 cm from instrument cluster breakout)
• (left front of intake manifold)
• A16
• Ashtray lamp
• Audio alarm module
• Automatic transfer case control module
• Automatic transfer case select switch
• Auxiliary cooling fan motor
• Auxiliary heater control switch (utility)
• Body control module
• Brake trans- mission shift interlock switch
• C10
• Cargo lamp switch (pickup)
• Cigar lighter
• Convenience center
• D10
• D12
• D13
• Data link connector
• Daytime running lamps module
• Fog lamp switch (luxury)
• Front auxiliary power outlet
• Front windshield wiper/ washer pump motor
• G101 (right front side of eng compt, at wheelhousing)
• G101 (right front wheelhouse)
• G105 (right rear of engine compt)
• G108 (left radiator support, near left headlamp)
• G110 (diesel)
• G117 (right rear of engine)
• G121 (top center of firewall)
• G202 (behind left side of dash)
• Ground strap
• Headlamp & panel dimmer switch
• Heater & a/c control switch
• Horn switch
• Hvac control module
• I/p compartment lamp
• Ignition switch
• Inflatable restraint i/p module enable switch
• Key-in warning buzzer switch (luxury)
• Left battery
• Left fog lamp
• Left front door jamb switch
• Left front park/ turn lamp
• Left high beam headlamp
• Left high/ low beam headlamp
• Left horn
• Left low beam headlamp
• Liftgate release switch (utility)
• Low coolant level indicator module (diesel)
• Luxury
• Pickup only
• Radio
• Rear stereo controller
• Rear window washer pump motor
• Rear window wiper/ washer switch (utility)
• Right fog lamp
• Right front door jamb switch
• Right front park/ turn lamp
• Right high beam headlamp
• Right high/ low beam headlamp
• Right horn
• Right low beam headlamp
• S123 (forward lamps harness, approx 23 cm from left park/lamp breakout)
• S128 (forward lamps harness, approx 5 cm from right headlamp breakout)
• S158 (in washer pump jumper harness)
• S204 (i/p harness, approx 10 cm from steering column harn)
• S218 (i/p harness, aprrox 16 cm from dlc breakout)
• S298
• S336 (floor console harn, approx 5 cm from crossbody in-line connector breakout)
• Shock sensor
• Spare
• To s316 (diagram 2 of 4)
• Transfer case control module
• Transfer case select switch
• Turn/ hazard flasher
• Uncoated
• Under- hood lamp
• Vehicle interface unit (luxury)
• W/ dual horns
• W/ quad headlamps
• W/ quad headlamps/ sport package
• Windshield wiper motor module

Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis C2000 3500

List of elements for Ground Distribution Wiring Diagram (2 of 4) for GMC Cab & Chassis C2000 3500:

• (4wd harn, approx 10 cm from transfer case relay breakout)
• (eng harn, approx 16 cm into vehicle speed sensor breakout)
• (engine harness, near diode)
• (i/p harness, approx 8 cm from i/p cluster breakout)
• (illuminated vanity mirror jumper, approx 11 cm toward left illuminated vanity mirror)
• (oxygen sensor jumper harn, approx 7 cm from right bank oxygen sensor harn)
• (right front of engine block) g119
• (right front of engine, near thermostat housing)
• 87a
• A.i.r. solenoid check valve
• A/c com- pressor low cutout switch
• A/c compressor clutch
• A/c compressor clutch relay
• A/c compressor cycling switch
• A/c compressor pressure switch
• Air injection reactor pump (7.4l only)
• Air pump motor
• Brake pressure warning switch
• Cruise control module
• Data link connector
• Diesel
• E16
• Electrochromic rearview mirror w/ compass
• Electronic brake control module
• Evo passlock module
• Except utility
• From s204 (diagram 1 of 4)
• Front axle actuator
• Fuel heater
• Fuel pump relay
• G110 (left front of engine)
• G119
• G134 (right top center of cylinder head)
• G202 (left side of dash)
• Gasoline
• Glow plug relay
• Heated oxygen sensor (5.0l: bank 1 sensor 2, 5.7l w/ below 8600 gvw: bank 2 sensor 2, 5.7l w/ over 8600b gvw & 7.4l: bank 1 sensor 2)
• Heated oxygen sensor (5.0l: bank 1 sensor 3, 5.7l w/ below 8600 gvw: bank 1 sensor 2, 5.7l w/ over 8600b gvw & 7.4l: bank 2 sensor 2)
• Heated oxygen sensor bank 1 sensor 1
• Heated oxygen sensor bank 1 sensor 2
• Ignition control module
• Inflatable restraint front end sensor
• Inflatable restraint sensing & diagnostic module
• Instrument cluster
• Left illuminated vanity mirror
• Low coolant level sensor
• Mass airflow sensor
• Park/ neutral position switch
• Right illuminated vanity mirror
• Roof marker lamps
• S103 (eng harn, 5.0l/5.7l: 8 cm from egr, 6.5l/7.4l: 12 cm from starter solenoid breakout)
• S107 (engine harness, 5.0l/5.7l: approx 20 cm egr, 6.5l: approx 40 cm from ebcm, 7.4l: approx 18 cm from ebcm breakout)
• S147 (diesel: eng harn, approx 4 cm from starter motor solenoid, gas: eng harn, approx 5 cm from egr valve breakout)
• S149
• S156
• S162 (5.0l/5.77l: eng harn, 17 cm from starter solenoid breakout, 7.4l: eng harn, approx 15 cm from right bank oxygen sensor breakout)
• S167 (battery harn, at left side of eng compt)
• S185
• S186
• S215
• S302
• S302 (4wd harn, approx 10 cm from transfer case relay breakout)
• S316
• Starter relay
• Stoplamp relay
• Trans range switch
• Transfer case relay
• Transfer case shift control module
• Transfer case shift switch
• Underhood fuse block
• Vehicle control module
• Vehicle speed sensor
• Water in fuel filter
• Water valve (utility)

Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis C2000 3500

List of elements for Ground Distribution Wiring Diagram (3 of 4) for GMC Cab & Chassis C2000 3500:

• (i/p harness, approx 12 cm from i/p cluster breakout)
• (left seat harn, approx 5 cm from power seat lumbar switch breakout)
• (right front seat harn, approx 5 cm from power seat lumbar switch breakout)
• (right side of dash)
• Audio amplifier
• Auxiliary power connector rear console
• Base pickup
• Bench seat
• Body control module
• Cargo lamp
• Center high mount stop- lamp
• Data link connector
• Diesel
• Door lock inversion module
• Door lock relay
• E16
• Evo passlock module
• Except pickup & ext. cab
• Four-wheel drive indicator lamp
• Front blower motor
• Fuel gauge sender
• Fuel pump balance module
• Fuel pump relay
• G134 (front top of engine)
• G201
• G905 (right "c" pillar)
• Headlamp control module (luxury)
• Heated mirror relay
• High blower motor relay
• Instrument cluster
• Interior lamp control module
• Left front door lock switch
• Left front power door lock switch
• Left front seat belt switch
• Left power lumbar support motor
• Left power seat adjuster switch
• Left rear heated seat element
• Left rear heated seat module
• Left rear heated seat switch
• Left rear power window switch
• Left rear seat belt switch
• Luxury
• Mass airflow sensor
• Mode door motor
• Others
• Pickup & ext. cab
• Pickup only
• Pickup/ extended & crew only
• Power amplifier relay
• Power door locks only
• Power outside rearview mirror switch
• Power window master switch
• Powertrain control module
• Rear window defogger grid (crew cab)
• Rear window lockout switch (except 2-dr utility)
• Recirculation door motor
• Remote control door lock receiver
• Right front power lumbar support motor
• Right front power outside rear view mirror motor
• Right front power seat adjuster switch
• Right front power seat lumbar motor
• Right front power window switch
• Right front seat belt switch
• Right rear heated seat element
• Right rear heated seat module
• Right rear heated seat switch
• Right rear power window switch
• Right rear seat belt switch
• Right seat power lumbar motor
• S103 (engine harness, approx 12 cm from starter solenoid breakout)
• S215
• S227
• S228
• S244 (hvac harn, approx 8cm from recirculation door breakout)
• S251 (crossbody harness, approx 13cm right of left door harness breakout)
• S259 (crossbody harness, approx 7 cm into seat belt switch breakout)
• S317 (taillamp extension harness, approx 10 cm from fuel gage sender breakout)
• S330 (floor console harn, approx 13 cm from heated seat breakout)
• S337 (left rear heated seat harn)
• S358
• S500
• S500 (inside left front door harness, 8 cm from tweeter speaker breakout)
• Secondary fuel gage sender
• Security led
• Temperature door motor
• Transfer case mode selector illumination lamp
• Transfer case shift control module
• Under- hood fuse block
• Vehicle speed sensor buffer
• W/ a/c
• W/ dual tanks
• W/ rke
• W/o a/c
• W/o rke

Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis C2000 3500

List of elements for Ground Distribution Wiring Diagram (4 of 4) for GMC Cab & Chassis C2000 3500:

• (auxiliary hvac harn, approx 7 cm from blower motor resistor breakout)
• (diesel)
• (front- to-rear body harn, appr0x 8 cm from chmsl breakout)
• (gas)
• (license lamps harness, approx 8 cm from tail- lamp harness breakout)
• (rear lamps harness, 17-33 cm from taillamps extension breakout)
• (right front seat harn, approx 5 cm from power seat lumbar switch breakout) s321
• Auxiliary blower motor
• Auxiliary heater- a/c logic module
• Auxiliary mode door motor
• Auxiliary temp door motor
• Cargo door lock relay
• Cargo doors
• Center high mount stoplamp
• Chassis cab & heavy duty
• Door lock control module (w/ cargo doors)
• Endgate marker lamps
• Except chassis cab & heavy duty
• Front auxiliary heater-a/c control module
• Front dome lamp
• Fuel pump & sender (primary)
• Fuel pump & sender (secondary)
• G305 (right 'b' pillar)
• G415 (left frame rail, behind bumper)
• G416 (inside left framerail, near rear crossmember)
• Garage door opener
• In-line resistor
• Left cargo door defogger grid
• Left door contact button
• Left front clearance lamp
• Left license lamp
• Left rear clearance lamp
• Left rear tail, stop, license, turn & back-up lamps
• Left rear tail, stop, turn & backup lamps
• Left tail, stop, turn & backup lamps
• Lift gate
• Liftgate release relay
• Liftgate window defogger grid
• Luxury
• Nca
• Pickup w/ dual rear wheels
• Reading lamp overhead console
• Rear auxiliary heater-a/c control module
• Rear auxiliary power connector
• Rear dome lamp
• Rear door jamb switch
• Rear wiper motor module
• Right cargo door defogger grid
• Right door contact button
• Right front clearance lamp
• Right license lamp
• Right rear clearance lamp
• Right rear tail, stop, license, turn & back-up lamps
• Right rear tail, stop, turn & back-up lamps
• Right tail, stop, turn & backup lamps
• S307 (rear hvac control harness, approx 10 cm from hvac logic module breakout)
• S319 (taillamp extension harn, approx 7cm from fuel pump and sender breakout)
• S403
• S410 (front to rear lamps harness, 1213 cm from right rear door speaker breakout)
• S411
• S411 (rear lamps harness, 17-33 cm from taillamps extension breakout)
• S416
• S419
• S424
• Trailer ground (taped back)
• Utility
• W/ dual tanks

HEADLIGHTS

Headlight Wiring Diagram, with Quad Headlamps for GMC Cab & Chassis C2000 3500

List of elements for Headlight Wiring Diagram, with Quad Headlamps for GMC Cab & Chassis C2000 3500:

• (except gas: i/p harn, near strng col harn breakout) (gas: i/p harn, near auxiliary power outlet)
• (forward lamps harn, approx 12 cm from left headlamp breakout toward windshield washer pump)
• Acc
• Brake ind ctrl
• Brake warn in
• Bulb test
• Convenience center (under left side of dash)
• Daytime running lamp module (behind left side of dash)
• Daytime running lamps relay
• Diode 203
• Drl indicator
• Drl relay ctrl
• Drl-fog fuse 15 20a
• Exterior lights system
• Fog lamp relay
• Fog lamp switch
• G101 (right front side of engine compartment)
• G108 (left radiator support)
• G134 (right top center of cylinder head)
• G202 (behind left side of dash)
• Gauges fuse 4 10a
• Ground
• Head
• Head- lamp dimmer switch
• Headlamp & panel dimmer switch
• High beam indicator
• Hot at all times
• Hot in run, bulb test or start
• I/p fuse block (left side of dash)
• Ignition
• Ignition switch
• Illum lamp
• Ind bulb chk
• Instrument cluster
• Instrument cluster system (brake warning indicator)
• Interior lights system
• Lamp feed
• Left fog lamp
• Left high beam head- lamp
• Left low beam head- lamp
• Lighting fuse 8 50a
• Lock
• Nca
• Off
• On indicator
• Park
• Park brake sig
• Park brake warning switch
• Pk lps fuse 9 20a
• Pnk
• Red
• Red c
• Right fog lamp
• Right high beam head- lamp
• Right low beam head- lamp
• Run
• S120 (forward lamps harn, near windshield washer pump breakout, toward left hdlp)
• S121
• S123
• S126
• S128
• S204
• S205
• S210
• S213
• S215
• S218
• S225 (i/p harn, approx 12 cm from radio harn breakout)
• S298
• Start
• Tan
• Underhood fuse block (left rear of engine compt)
• W/ fog lamps

Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Cab & Chassis C2000 3500

List of elements for Headlight Wiring Diagram, with Sealed Beam Headlamps for GMC Cab & Chassis C2000 3500:

• (except gas: i/p harn, near strng col harn breakout) (gas: i/p harn, near auxiliary power outlet)
• (forward lamps harn, approx 12 cm from left headlamp breakout toward windshield washer pump)
• (high)
• (low)
• A (high)
• A (low)
• Acc
• Brake ind ctrl
• Brake warn in
• Bulb test
• Convenience center (under left side of dash)
• Daytime running lamp module (behind left side of dash)
• Daytime running lamps relay
• Diode 203
• Drl indicator
• Drl relay ctrl
• Drl-fog fuse 15 20a
• Exterior lights system
• Fog lamp relay
• Fog lamp switch
• G101 (right front side of engine compartment)
• G108 (left radiator support)
• G134 (right top center of cylinder head)
• G202 (behind left side of dash)
• Gauges fuse 4 10a
• Ground
• Head
• Head- lamp dimmer switch
• Headlamp & panel dimmer switch
• High beam indicator
• Hot at all times
• Hot in run, bulb test or start
• I/p fuse block (left side of dash)
• Ignition
• Ignition switch
• Illum lamp
• Ind bulb chk
• Instrument cluster
• Instrument cluster system (brake warning indicator)
• Interior lights system
• Lamp feed
• Left fog lamp
• Left head- lamp
• Lighting fuse 8 50a
• Lock
• Nca
• Off
• On indicator
• Park
• Park brake sig
• Park brake warning switch
• Pk lps fuse 9 20a
• Pnk
• Red
• Red c
• Right fog lamp
• Right head- lamp
• Run
• S120 (forward lamps harn, near windshield washer pump breakout toward left headlamp)
• S121
• S123
• S126
• S128
• S204
• S205
• S210
• S213
• S215
• S218
• S225 (i/p harn, approx 12 cm from radio harn breakout)
• S298
• Start
• Tan
• Tan c
• Underhood fuse block (left rear of engine compt)
• W/ fog lamps

HORN

Horn Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Horn Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (inside left door harness, approx 25 cm to outside mirror breakout) s124
• A11
• Base
• Body control module (in center console)
• C1 c9
• C210
• C266
• Convenience center (under left side of dash)
• G101 (right front of engine compt, at wheelhousing)
• G202 (behind left side of dash, below fuse box)
• Horn fuse 20a
• Horn relay
• Horn slip ring
• Horn switch
• Hot at all times
• Left horn (front of vehicle)
• Luxury
• Remote control door lock receiver (behind center of dash)
• Right horn (w/ front end appearance package only) (front of vehicle)
• S113
• S128
• S204
• Steering wheel
• Underhood fuse block
• Underhood fuse block (left rear of engine compt)
• Vehicle interface unit receiver (under- neath right rear seat)

INSTRUMENT CLUSTER

5.7L

5.7L VIN R, Instrument Cluster Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Instrument Cluster Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (6 bulbs)
• (engine harn)
• (taillamp extension harn, approx 10 cm from breakout to ground at left side framerail)
• (taillamp extension harn, approx 6 cm from fuel pump harness breakout)
• 39 (or 1020)
• 5v ref
• 7.4l vin j only
• A/t
• A/t w/4wd
• Accy
• Air bag ind
• Anti- lock brakes ind
• Anti-lock brakes system
• Anti-theft system
• Bat ind
• Brake ind
• Brake pressure warning switch (on underside of electronic brake control module)
• Brake psi
• Check gauges ind
• Check gauges lamp driver
• Convenience center
• Daytime running lamps ind
• Daytime running lamps module (behind left side of dash, taped to panel wiring harness)
• Electronic brake control module (ebcm) (on left side of engine compt)
• Engine controls system (fuel pump balance relay)
• Engine coolant temperature sender (left cylinder head, near 1 spark plug)
• Exterior lights system
• Fuel
• Fuel gauge
• Fuel in
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (inside left side of frame rail)
• Fuel pump/ oil pressure switch & sender (rear top center of engine)
• Fuel ret
• Fuel tank
• G119 (right front of engine block)
• G134 (right top center of cylinder head)
• Gauges fuse 4 10a
• Headlights system
• Hi beam ind
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block
• Ign
• Ign e mini fuse 10a
• Ign sw
• Ignition coil (top left rear of engine)
• Ignition switch
• Illumination
• Instrument cluster
• Interior lights system
• Led dimming
• Left turn ind
• Lock
• M/t
• M/t w/4wd & all w/2wd
• Malfunc- tion indicator lamp (service engine soon)
• Mil ind
• Nca
• Off
• Oil gauge
• Parity prndl
• Park brake switch (on park brake pedal bracket)
• Pk brake
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Right turn ind
• Run
• S103
• S147
• S162
• S213
• S215
• S232
• S315
• S324
• S325 (cali)
• S430
• Safety belt ind
• Secondary fuel gauge sender (in rear fuel tank)
• Security ind
• Sens rtrn
• Single dual fuel tanks
• Speedo
• Speedometer
• Start
• Starting/charging system
• Tach
• Tan
• Temp gauge
• Trans fuse 20 10a
• Transmission range switch (left side of transmission)
• Twisted pair
• Underhood fuse block
• Upshift ind
• Upshift ind (m/t only)
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (left side of transmission, left side of tran- sfer case w/ 4wd)
• Vehicle speed sensor (vss) adapter
• Voltmeter
• Vss
• Warning systems

6.5L

6.5L VIN F, Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Instrument Cluster Wiring Diagram (1 of 2) for GMC Cab & Chassis C2000 3500:

• (6 bulbs)
• 39 (or 1020)
• Air bag ind
• Anti- lock brakes ind
• Anti-lock brakes system
• Anti-theft system
• Bat ind
• Brake ind
• Check gauges ind
• Check gauges lamp driver
• Daytime running lamps ind
• Dimming led
• Engine controls system
• Engine coolant temperature sensor (on top right front of engine, near thermostat housing)
• Exterior lights system
• Fuel gauge
• Fuel pump/ oil pressure switch & sender (under intake manifold, center of engine)
• G119 (right front of engine block)
• G134 (front top of engine)
• G202 (behind left side of dash)
• Generator
• Gnd
• Headlights system
• Hi beam ind
• Ign
• Illumination
• Instrument cluster
• Interior lights system
• Left turn ind
• Low coolant ind
• Low coolant level indicator module (behind center of dash)
• Low coolant level switch (in coolant reservoir, right side of engine compt)
• Oil press
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Prndl parity
• Right turn ind
• S107
• S147
• S215
• S298
• Safety belt ind
• Security ind
• Service engine soon ind
• Service throttle soon ind
• Solid state
• Speed- ometer
• Starting/charging system
• Tach
• Tan
• Temp gauge
• Transmission range switch (left side of transmission)
• Volt- meter
• Wait to start ind
• Warning systems
• Water in fuel ind
• Water-in fuel sensor (on fuel filter/ manager)

6.5L VIN F, Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Instrument Cluster Wiring Diagram (2 of 2) for GMC Cab & Chassis C2000 3500:

• (i/p harn, 16 cm into cluster breakout)
• 4wd a/t
• 4wd m/t & all 2wd
• A/t
• Accy
• Anti-lock brakes system
• Brake ind
• Brake pressure warning switch (on rear of ebcm casting)
• Brake psi
• Daytime running lamps module (behind left side of dash, taped to panel wiring harness)
• Dual fuel tanks
• Electronic brake control module (ebcm) (on left side of engine compt)
• Eng 1 mini fuse 20a
• Engine controls system
• Engine controls system (fuel pump balance relay)
• Fuel gauge sender (in front fuel tank)
• Fuel pump & sender
• Fuel pump balance module (inside left side of frame rail)
• Fuse/relay block (left rear of engine compt)
• G119 (right front of engine block)
• G134 (front top of engine)
• Gauges fuse 4 10a
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block (under left side of dash)
• Ign e mini fuse 10a
• Ign sw
• Ignition switch
• Lock
• M/t
• Nca
• Off
• Park brake switch (on park brake pedal bracket)
• Pk brake
• Pnk
• Radio
• Run
• S103
• S107
• S108
• S211
• S213
• S215
• S315
• S317
• Secondary fuel gauge sender (in rear fuel tank)
• Single fuel tank
• Start
• Trans fuse 20 10a
• Twisted pair
• Vehicle speed sensor (left side of transmission, left side of transfer case w/ 4wd)
• Vehicle speed sensor (vss) adapter
• Vehicle speed sensor buffer (behind right side of dash)

7.4L

7.4L VIN J, Instrument Cluster Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Instrument Cluster Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (6 bulbs)
• (engine harn)
• (taillamp extension harn, approx 10 cm from breakout to ground at left side framerail)
• (taillamp extension harn, approx 6 cm from fuel pump harness breakout)
• 39 (or 1020)
• 5v ref
• 7.4l vin j only
• A/t
• A/t w/4wd
• Accy
• Air bag ind
• Anti- lock brakes ind
• Anti-lock brakes system
• Anti-theft system
• Bat ind
• Brake ind
• Brake pressure warning switch (on underside of electronic brake control module)
• Brake psi
• Check gauges ind
• Check gauges lamp driver
• Convenience center
• Daytime running lamps ind
• Daytime running lamps module (behind left side of dash, taped to panel wiring harness)
• Electronic brake control module (ebcm) (on left side of engine compt)
• Engine controls system (fuel pump balance relay)
• Engine coolant temperature sender (left cylinder head, near 1 spark plug)
• Exterior lights system
• Fuel
• Fuel gauge
• Fuel in
• Fuel pump & sender (in fuel tank)
• Fuel pump balance module (inside left side of frame rail)
• Fuel pump/ oil pressure switch & sender (rear top center of engine)
• Fuel ret
• Fuel tank
• G119 (right front of engine block)
• G134 (right top center of cylinder head)
• Gauges fuse 4 10a
• Headlights system
• Hi beam ind
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block
• Ign
• Ign e mini fuse 10a
• Ign sw
• Ignition coil (top left rear of engine)
• Ignition switch
• Illumination
• Instrument cluster
• Interior lights system
• Led dimming
• Left turn ind
• Lock
• M/t
• M/t w/4wd & all w/2wd
• Malfunc- tion indicator lamp (service engine soon)
• Mil ind
• Nca
• Off
• Oil gauge
• Parity prndl
• Park brake switch (on park brake pedal bracket)
• Pk brake
• Pnk
• Prndl
• Prndl a
• Prndl b
• Prndl c
• Right turn ind
• Run
• S103
• S147
• S162
• S213
• S215
• S232
• S315
• S324
• S325 (cali)
• S430
• Safety belt ind
• Secondary fuel gauge sender (in rear fuel tank)
• Security ind
• Sens rtrn
• Single dual fuel tanks
• Speedo
• Speedometer
• Start
• Starting/charging system
• Tach
• Tan
• Temp gauge
• Trans fuse 20 10a
• Transmission range switch (left side of transmission)
• Twisted pair
• Underhood fuse block
• Upshift ind
• Upshift ind (m/t only)
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed sensor (left side of transmission, left side of tran- sfer case w/ 4wd)
• Vehicle speed sensor (vss) adapter
• Voltmeter
• Vss
• Warning systems

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram, Old Style for GMC Cab & Chassis C2000 3500

List of elements for Courtesy Lamps Wiring Diagram, Old Style for GMC Cab & Chassis C2000 3500:

• (crossbody harn, approx 22 cm from left door harn breakout)
• (i/p harn, approx 6 cm from i/p compt box lamp breakout) s208
• (w/ rke)
• Bat
• Braided ground strap
• Cargo door jamb switch (suburban/ utility only)
• Courtesy lamps
• Ctrl
• Ctsy fuse 3 20a
• Dome defeat
• Dome lamp defeat
• Door jamb
• Door lock control module (in front of left rear wheelwell)
• Front dome/ reading lamps
• G201 (right side of dash)
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• Gages fuse 4 10a
• Gnd
• Headlamp & panel dimmer switch
• Horn fuse 20a
• Hot at all times
• Hot in run, bulb test or start
• I/p compart- ment box lamp
• I/p fuse block
• Ign sw
• Interior lamp control module (under center of dash)
• Lamp out
• Left
• Left front door courtesy lamp (if equipped)
• Left front door jamb switch
• Left i/p courtesy lamp
• Left illuminated vanity mirror
• Left rear door courtesy lamp (if equipped)
• Mirrors system
• Nca
• Overhead console lamps circuit
• Pnk
• Pnk a
• Pnk j
• Rear dome/ reading lamps (if equipped)
• Rear door jamb switch (if equipped)
• Remote control door lock receiver (behind center of dash)
• Right
• Right front door courtesy lamp (if equipped)
• Right front door jamb switch
• Right i/p courtesy lamp
• Right illuminated vanity mirror
• Right rear door courtesy lamp (if equipped)
• S113
• S204
• S209 (i/p harn, approx 13 cm from i/p compt box lamp breakout)
• S213
• S218
• S242
• S246
• S248
• S251
• S262 (crossbody harn, approx 19-25 cm from seat belt switch breakout)
• S312
• S316
• S410
• S417 (4 door) (2 door) (front to rear (front to body harn, rear body approx 20 cm harn, approx into crossbody 34 cm from front harn dome lamp breakout) breakout)
• S426
• Underhood fuse/relay center
• Underhood lamp
• W/ overhead console
• W/ rke
• W/o overhead console
• W/o rke

Instrument Illumination Wiring Diagram, Old Style (1 of 2) for GMC Cab & Chassis C2000 3500

List of elements for Instrument Illumination Wiring Diagram, Old Style (1 of 2) for GMC Cab & Chassis C2000 3500:

• (behind left side of dash)
• (crossbody harn, approx 6 cm in left door harn breakout)
• (floor console harn, 12 cm from cd player harn breakout) s333
• (right side of dash)
• Ash tray lamp
• Body control module (in center console)
• Exterior lights system
• G201
• G202
• G305 (right "b" pillar)
• Garage door opener lamp
• Headlamp & panel dimmer switch
• Hot at all times
• I/p fuse block
• Left front power window switch
• Left rear heated seat switch
• Left rear power window switch
• Off
• Parade mode sw
• Park
• Park lps fuse 9 20a
• Power outside rearview mirror switch
• Rear stereo controller
• Rear window lockout switch
• Rheo- stat
• Right front power window switch
• Right rear heated seat switch
• Right rear power window switch
• S210 (i/p harn, approx 12 cm from steering column harn breakout)
• S218
• S247
• S251
• S259
• S321
• S330
• S336
• S500
• S502 (left front door harn, near tweeter)

Instrument Illumination Wiring Diagram, Old Style (2 of 2) for GMC Cab & Chassis C2000 3500

List of elements for Instrument Illumination Wiring Diagram, Old Style (2 of 2) for GMC Cab & Chassis C2000 3500:

• (6) bulbs
• (behind left side of dash)
• (front to rear body harn, 5 cm from auxiliary hvac fan switch breakout)
• (i/p harn, near i/p cluster breakout) s217
• Audio alarm module (on convenience center)
• Automatic transfer case control switch (luxury) c1
• Automatic transfer cash select switch
• Auxiliary heater control switch (subur- ban/ utilitiy only)
• Base
• Cargo lamp switch (pickup only)
• Conven- ience center
• Daytime running lamp (drl)/ radio override switch
• Daytime running lamps (drl)/ radio override switch
• Display dim sig
• Fog lamp switch
• Front auxiliary hvac control lamp
• G131 (near thermostat housing)
• G201 (right side of dash)
• G202
• G305 (at right "b" pillar)
• Headlamp & panel dimmer switch
• Hot at all times
• Hvac control lamp
• I/p fuse block
• Illum fuse 14 10a
• Illumination
• Inflatable restaint i/p module switch
• Instrument cluster
• Liftgate release switch (subur- ban/ utilitiy only)
• Luxury
• Off
• Parade mode sw
• Park
• Park lps fuse 9 20a
• Pickup/ extended cab only
• Radio
• Rear auxiliary hvac control lamp
• Rear auxiliary hvac control switch
• Rear window wiper/ washer switch (subur- ban/ utilitiy only)
• Rheo- stat
• S204
• S215
• S216 (i/p harn, near i/p cluster breakout)
• S218
• S253 (cross- body harn, near i/p harn breakout)
• S259
• S307
• S310
• Suburban & utility only
• Transfer case shift illumination lamp
• Transfer case switch
• Z56 only

Overhead Console Lamps Wiring Diagram, Old Style Base for GMC Cab & Chassis C2000 3500

List of elements for Overhead Console Lamps Wiring Diagram, Old Style Base for GMC Cab & Chassis C2000 3500:

• (front to rear body harn, approx 34 cm from front dome lamp breakout) (2 door) s417
• (under center of dash) (w/o rke) interior lamp control module
• Courtesy lamps
• Courtesy lamps circuit
• Ctsy fuse 3 20a
• Front dome/ reading lamps
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• Headlamp & panel dimmer switch
• Hot at all times
• I/p fuse block
• Int lamp output
• Int lamp output c1
• Overhead console reading lamps
• Rear dome/ reading lamps
• Remote control door lock receiver (w/rke) (behind center of dash)
• S204
• S209 (i/p harn, approx 13 cm from i/p compt lamp breakout)
• S246 (crossbody harn, approx 22 cm from left door harn breakout)
• S320
• S321
• S410
• S426

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 5) for GMC Cab & Chassis C2000 3500

List of elements for Power Distribution Wiring Diagram (1 of 5) for GMC Cab & Chassis C2000 3500:

• (crossbody harn, approx 22 cm from left door harness breakout)
• (diesel-eng harn, 6.5cm from ebcm breakout gasoline-eng harn, 12cm from ebcm breakout)
• (eng harn, approx 19cm from electronic brake control module breakout) s113
• (i/p harn, near steering column harness breakout) s205
• (overhead console harn, between garage door opener & reading lamp)
• (stud a)
• (stud b)
• (vanity mirror jumper harn, approx 4 cm from inside rearview mirror)
• 175a
• 7.4l
• A nca
• A/c comp fuse 10a
• A/c compressor clutch relay
• Abs fuse 4 60a
• Aux fan fuse 30a
• Aux pwr auto headlap fuse 22 20a
• Auxiliary cooling fan relay
• Blower fuse 3 50a
• Body control module (bcm)
• Brake lamp relay
• C13
• Camp/trail fuse 30a
• Cargo lamp switch
• Convenience center
• Ctsy fuse 3 20a
• D13
• Daytime running lamps relay
• Diode
• Drl/fog fuse 15 20a
• Dual battery
• Ecm-b fuse 20a
• Electronic brake control module
• Evo/ passlock module
• Front dome lamp
• Front dome lamps
• Fuel pump oil pressure switch
• Fuel pump relay
• Fusible link (5 ga-rust)
• Garage door opener
• Generator (base)
• Generator (uplevel)
• Headlamp & panel dimmer switch
• Headlamp and panel dimmer switch
• Headlamp control module
• Heater mirror relay
• High blower motor relay
• Horn fuse 20a
• Horn relay
• Htd mir fuse 10a
• Hvac control module
• I/p compartment box lamp
• I/p fuse block
• Interior lamp control module
• Left battery (diesel)
• Left courtesy lamp
• Left front door courtesy lamp
• Left rear door courtesy lamp
• Left vanity mirror
• Lighting fuse 8 50a
• Luxury only
• Mega fuse block
• Overhead console reading lamps
• Pickup only
• Pk lps fuse 9 20a
• Power outside rearview mirror switch
• Powertrain control module (diesel)
• Rear dome lamps
• Red
• Remote battery stud
• Right battery
• Right courtesy lamp
• Right front door courtesy lamp
• Right rear door courtesy lamp
• Right vanity mirror
• Rr defog fuse 30a
• S101
• S242 (i/p harn, 12cm from inflatable restraint switch breakout)
• S248 (crossbody harn, approx 35 cm from left front door harn breakout)
• S312 s312
• S325
• S426
• S443
• Security/ strg fuse 21 10a
• Seo fuse 30a
• Single battery (base)
• Single battery (uplevel)
• Spare power source
• Starter motor solenoid
• Stop fuse 2 50a
• To fusible link (diagram 5 of 5)
• To underhood fuse block (diagram 2 of 5)
• Underhood fuse block
• Underhood lamp
• Vehicle control module (gasoline)
• W/o rear auxiliary heater or a/c
• W/o rke

Power Distribution Wiring Diagram (2 of 5) for GMC Cab & Chassis C2000 3500

List of elements for Power Distribution Wiring Diagram (2 of 5) for GMC Cab & Chassis C2000 3500:

• (2dr w/ rke & 4dr)
• (crossbody harn, 20 cm from convenience center breakout) s255
• (crossbody harn, approx 19 cm from conenience center)
• (front-to-rear body harn, approx 6 cm from convenience center breakout)
• (i/p harn, 12cm from steering column harness breakout) s200
• (i/p harn, 4cm from auxiliary power outlet breakout)
• (i/p harn, 4cm from steering column harness breakout)
• (i/p harn, approx 10 cm into steering column harn breakout)
• (i/p harn, left rear of engine compartment)
• (luxury only)
• (power lumbar seat jumper harn, approx 13 cm from right power seat breakout)
• (utility only)
• 30a (others)
• 8cm from i/p cluster breakout) s264
• Audio alarm module
• Audio amplifier
• Automatic
• Automatic transfer case
• Automatic transfer case control module
• Aux/pwr fuse 7 25a
• Base
• Base cargo door
• Base cargo doors/upper level liftgate
• Base liftgate/ upper level cargo doors
• Battery fuse 7 50a
• Cargo door lock relay
• Cig ltr fuse 13 20a
• Cigar lighter
• Convenience center
• D14
• D15
• Data link connector
• Door lock control module
• Door lock relay
• Electric
• From underhood fuse block (diagram 1 of 5)
• Front auxiliary power connector
• G202 (left side of dash)
• I/p fuse block
• Left front door lock switch
• Left front power lumbar seat switch
• Left power seat adjuster switch
• Liftgate release relay
• Liftgate release switch
• Luxury level
• Luxury only
• Non- base
• Others
• Pickup
• Pickups w/o rke
• Power amplifier relay (suburban)
• Pwr-accy circuit breaker a (regular 20a cab/extended cab/luxury)
• Radio
• Radio batt fuse 19 10a
• Rear auxiliary power connector (luxury)
• Rear console auxiliary power connector (luxury)
• Rear door lock switch
• Red
• Remote control door lock receiver
• Remote control door lock receiver (uplevel speakers)
• Right front door lock switch
• Right front power lumbar seat switch
• Right front power seat lumbar switch
• Right lumbar power seat switch
• Right power seat adjuster switch
• S212
• S218
• S236
• S237
• S255
• S256
• S272
• S299
• S300
• S434
• Stop lamp switch
• Stop/haz fuse 1 20a
• Suburban/ utility
• T case fuse 2 20a
• To underhood fuse block (diagram 3 of 5)
• Transfer case control module
• Turn/ hazard switch
• Underhood fuse block
• Vehicle interface unit
• W/ rke
• W/bench seat

Power Distribution Wiring Diagram (3 of 5) for GMC Cab & Chassis C2000 3500

List of elements for Power Distribution Wiring Diagram (3 of 5) for GMC Cab & Chassis C2000 3500:

• (a/t)
• (battery harn, red
• (cross body harn, 8cm from convenience center breakout)
• (floor console harn, 33 cm heated seat switch breakout)
• (gas) (diesel)
• (i/p harn, 12cm from steering column harn breakout) pnk
• (i/p harn, 22 cm before radio harn breakout) s292
• (i/p harn, 4 cm from steering column harn breakout) s213
• (i/p harn, 8 cm from automatic transfer case module breakout)
• (i/p harn, approx 8 cm from steering column harn breakout) s201
• (inside left front door harn at breakout to window motor regulator)
• (m/t)
• (w/o rke) (w/ rke)
• A j
• A/t
• Acc
• Air bag fuse 10 10a
• At left side of eng compt) s167
• Audio alarm module
• Automatic transmission controls
• Back-up lamp switch
• Body control module
• C210
• Clutch pedal position switch
• Convenience center
• Crank fuse 8 10a
• Daytime running lamps module
• Daytime running lamps relay
• Electrochromic rearview mirror w/ compass
• Evo/ passlock module
• From ignition switch (diagram 3 of 5)
• From underhood o
• Fuse block (diagram 2 0f 5)
• Gauges fuse 4 10a
• Headlamp control module
• Headlamp/ panel dimmer switch
• I/p fuse block
• Ign a fuse 6 40a 50a
• Ign b fuse 5 50a
• Ignition switch
• Inflatable restraint i/p module switch (pickup)
• Inflatable restraint sensing & diagnostic module
• Instrument cluster
• Interior lamp control module or remote control door lock receiver
• Lock
• Low coolant level indicator module (diesel)
• Luxury
• Luxury only
• M/t
• Off
• Others
• Park/neutral position switch
• Pnk
• Pnk k
• Pnk s207
• Power window master switch
• Pwr wdo circuit breaker 30a
• Radio
• Radio batt fuse 17 10a
• Rear stereo controller
• Rear window lockout switch (4-dr)
• Rear window wiper/washer switch (suburban/utility)
• Red
• Right front power window switch (2 dr & utility)
• Rr wiper fuse 23 25a
• Run
• S266
• S290
• S501
• Start
• Starter relay
• To s206 (diagram 5 of 5)
• To s207 (diagram 3 of 5)
• To underhood fuse block (diagram 4 of 5)
• To underhood fuse block (diagram 5 of 5)
• Trans fuse 20 10a
• Transfer case control module (selectable 4wd electric shift)
• Transfer case select switch
• Turn b/u fuse 16 20a
• Turn signal/ hazard switch
• Underhood fuse block
• Vehicle interface unit
• Vehicle speed sensor buffer (diesel)
• Windshield wiper motor module
• Windshield wiper/ washer switch
• Wiper fuse 11 25a

Power Distribution Wiring Diagram (4 of 5) for GMC Cab & Chassis C2000 3500

List of elements for Power Distribution Wiring Diagram (4 of 5) for GMC Cab & Chassis C2000 3500:

• (eng harn, 12 cm from fuel injector breakout)
• (eng harn, 30cm from ebcm breakout)
• (eng harn, approx 4 cm from i/p harn breakout) s166
• (eng harn, approx 5 cm from back-up lamp switch harn breakout)
• (eng harn, approx 8 cm from egr breakout)
• (eng harn, s146
• (in injector harn jumper)
• (taillamp extension harn, approx 17 cm from fuel pump
• 26 cm from ebcm breakout)
• 5.0l, 5.7l
• 6.5l pnk
• 7.4l
• 7.4l w/ california emissions
• A/c clutch relay
• A/c compressor clutch relay
• Air relay
• Balance module breakout) s315
• C11
• C12
• Crank- shaft position sensor
• Diesel
• Ecm 1 fuse 20a
• Egr linear pwm valve solenoid
• Egr solenoid
• Eng-1 fuse 20a
• Engine shutoff solenoid
• From splice s207 k (diagram 3 of 5)
• Fuel heater
• Fuel injector
• Fuel pump balance module
• Fuel pump balance relay
• Fuel solenoid driver
• Glow plug relay
• Ign e fuse 10a
• Ignition coil
• Ignition control module
• Mass airflow sensor
• Others
• Pnk
• Powertrain control module
• S104
• S108
• S154
• S155
• S161
• S190
• Underhood fuse block
• Vehicle control module
• Waste gate solenoid
• Water-in- fuel sensor

Power Distribution Wiring Diagram (5 of 5) for GMC Cab & Chassis C2000 3500

List of elements for Power Distribution Wiring Diagram (5 of 5) for GMC Cab & Chassis C2000 3500:

• (auxiliary a/c harn, 17cm from blower motor relays)
• (crossbody harn, 20 cm from sdm breakout)
• (crossbody harn, 27 cm from left rear heated seat breakout)
• (crossbody harn, approx 25 cm from sdm breakout)
• (eng harn, 7cm from ebcm) breakout)
• (floor console harn, approx 28 cm from left heated switch breakout) s332
• (hvac harn, approx 4 cm from recirculation door breakout)
• (i/p harn, 6cm from steering column harness breakout)
• (i/p harn, approx 7cm from inflatable restraint switch breakout) s268
• (i/p harn, approx 8 cm from steering column breakout)
• (luxury)
• (others)
• (rear hvac control harn, approx 5 cm from hvac logic module breakout) s308
• (tailamp extension harn, appr0x 10 cm from breakout to ground at left side frame rail, near crossmember)
• 4wd fuse 24 20a
• A13
• Automatic transfer case control module
• Automatic transfer case only
• Automatic transfer case select switch
• Auxiliary battery
• Auxiliary battery relay (left rear of engine compt)
• Auxiliary heater & a/c control logic module
• Auxiliary heater & a/c control module (front)
• Auxiliary heater & a/c control module (rear)
• Auxiliary high blower motor relay
• Auxiliary low blower motor relay
• Auxiliary medium blower motor relay
• Auxiliary mode door motor
• Auxiliary temperature door motor
• Brake fuse 18 10a
• Convenience center
• Cruise control module (gas only)
• Cruise control switch
• Cruise fuse 6 10a
• Diesel
• E10
• Electronic brake control module
• From ignition switch (diagram 3 of 5)
• From underhood e fuse block (diagram 3 of 5)
• From underhood fuse block (diagram 1 of 5)
• Front axle actuator
• Front heated seats fuse 20a
• Fusible link
• G100 (left front fender)
• Gas, base models
• Gas, except base models
• Htr-a/c fuse 12 25a
• Hvac control module
• I/p fuse block
• Left front heated seat module
• Left front heated seat switch
• Left rear heated seat module
• Left rear heated seat switch
• Luxury level
• Luxury models
• Mode door motor
• Rear heated seats fuse 20a
• Rear heater only
• Rear heater w/ cargo doors
• Rear heater w/ lift- gate
• Recirculation door motor
• Red
• Right front heated seat module
• Right front heated seat switch
• Right rear heated seat module
• Right rear heated seat switch
• Rr hvac fuse 5 10a
• S151
• S206
• S233
• S235
• S238
• S243
• S281
• S324
• S326
• S400
• Seats fuse 40a
• Spare power source
• Stop lamp switch
• Suburban utility only
• Temperature door motor
• Transfer case switch (k3500)
• Underhood fuse block
• Vehicle control module (gas only)
• W/ rear defrost

POWER DOOR LOCKS

Door Lock Wiring Diagram, with Crew Cab for GMC Cab & Chassis C2000 3500

List of elements for Door Lock Wiring Diagram, with Crew Cab for GMC Cab & Chassis C2000 3500:

• (crossbody harn, near seat belt switch breakout) s262
• (crossbody harn, under left side of dash) s258
• (crossbody harness, near door lock relay breakout) s256
• (front to rear harness, near dome lamp harn breakout) s434
• (front to rear harness, near rear window harn breakout) s431
• (i/p harn, 6 cm from glove box lamp breakout)
• 2 door 4 door
• 4 door
• Batt (b+)
• C210
• Cig ltr fuse 13 20a
• Convenience center (left side of dash)
• Door jamb sw
• Door lock control module (front of left rear wheelhouse)
• Door lock relay (under center of dash)
• G201 (right side of dash)
• G202 (behind left side of dash)
• G305 (right "b" pillar)
• Ground
• Hot at all times
• I/p fuse block (left side of dash)
• Left front door jamb switch
• Left front door lock actuator
• Left front door lock switch
• Left rear door jamb switch
• Left rear door lock actuator
• Lock
• Lock sig
• Pwr accy circuit breaker 30a
• Rear cargo door lock actuator (cargo doors)
• Rear door jamb switch
• Rear door lock switch (cargo doors)
• Right front door jamb switch
• Right front door lock actuator
• Right front door lock switch
• Right rear cargo door contactor (right rear door jamb)
• Right rear door jamb switch
• Right rear door lock actuator
• Rr door sw
• S204
• S208
• S218
• S255
• S257 (crossbody harness, near door lock relay harness breakout)
• S259
• S260 (crossbody harness, 6 cm from seat belt switch breakout)
• S261 (crossbody harness, 12 cm from seat belt switch breakout)
• S264
• S296
• S410
• S432 (front to rear harness, near left rear speaker harness breakout)
• Tan
• Unlock
• Unlock sig

Door Lock Wiring Diagram, without Crew Cab for GMC Cab & Chassis C2000 3500

List of elements for Door Lock Wiring Diagram, without Crew Cab for GMC Cab & Chassis C2000 3500:

• (inside right door harness) s601
• C210
• Convenience center (under left side of dash)
• G202 (behind left side of dash)
• Hot at all times
• I/p fuse block (under left side of dash)
• Left front door lock motor
• Left front door lock switch
• Lock
• Pwr accy circuit breaker 20a
• Right front door lock motor
• Right front door lock switch
• S255
• S500
• S600 (inside right door harness)
• Solid state
• Tan
• Unlock

Keyless Entry Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Keyless Entry Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (cross body harness, 6cm from seat belt switch breakout)
• (crossbody harn, near seat belt switch breakout) s262
• (crossbody harn, under left side of dash) s258
• (front to rear harness, near rear window harn breakout) s431
• (i/p harn, 6 cm from glove box lamp breakout)
• (regular/extended cab) (except regular/extended cab)
• (utility w/ cargo doors)
• 1576 (or 56)
• 2 door
• 4 door
• 640 (or 540)
• Batt (b+)
• C210
• Cargo door jamb switch
• Cargo door lock switch (w/ cargo doors)
• Cig ltr fuse 13 20a
• Convenience center (left side of dash)
• Data link connector (under left side of dash)
• Dome lamps
• Dome lmp off
• Door jamb sw
• Door lock control module (front of left rear wheelwell)
• Door lock relay (under center of dash, near remote control door lock receiver)
• Driver dr unlk
• G201 (behind right side of dash)
• G201 (right side of dash)
• G305 (right "b" pillar)
• Gauges fuse 4 10a
• Ground
• Horn ctrl
• Horns system
• Hot at all times
• Hot in run, bulb test or start
• I/p fuse block (left side of dash)
• Ignition
• Interior lamps system
• Left front door jamb switch
• Left front door lock actuator
• Left front door lock switch
• Left rear door jamb switch
• Left rear door lock actuator
• Lock
• Lock out
• Lock sig
• Pass drs unlk
• Pnk
• Program sig
• Pwr accy circuit breaker 20a 30a
• Rear cargo door lock actuator (cargo doors)
• Remote control door lock receiver (behind center of dash)
• Right front door jamb switch
• Right front door lock actuator
• Right front door lock switch
• Right rear cargo door contactor (right rear door jamb)
• Right rear door jamb switch
• Right rear door lock actuator
• Rr door sw
• Rr lftgte unlk
• S204
• S208
• S213
• S218
• S251
• S255
• S256
• S257 (crossbody harness, near door lock relay harness breakout)
• S259
• S261 (crossbody harness, 7 cm from seat belt switch harn breakout)
• S264 (suburban/ utility)
• S296 (luxury)
• S410
• S432 (front to rear harness, near left rear speaker harness breakout)
• S434
• Tan
• Trunk, tail- gate, fuel doors system
• Unlock
• Unlock out
• Unlock sig
• Utility w/ rear cargo doors
• Utility w/ rear liftgate
• W/ cargo doors
• W/ liftgate
• W/ power windows
• W/o power windows

POWER MIRRORS

Electrochromic Mirror Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Electrochromic Mirror Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind left side of dash) g202
• (eng harn, near breakout to ebcm)
• (luxury)
• A/t
• Ambient sensor (windshield side)
• Back-up lamp switch (on left side of trans- mission)
• Back-up lamp switch (part of park/neutral position switch) (on left side center of transmission)
• C/m
• C1 f
• Exterior lights system
• Gauges fuse 4 10a
• Ground
• Headlamp sensor (mirror side)
• Headlight control module signal
• Headlights system
• Hot in run or start
• I/p fuse block (under left side of dash)
• Inside automatic day-night mirror
• Left outside automatic day-night mirror (luxury)
• M/t
• Mirror input
• Mirrors switch
• Nca
• Off
• On indicator control
• Pnk
• Power distribution system
• Reset to daytime high reflectivity in reverse
• Right outside automatic day-night mirror (luxury)
• S160
• S213
• S279 (crossbody harness, approx 38 cm from convenience center pnk breakout)
• S316
• Solid state
• Switch breakout) s278
• T/m
• Temperature sensor (behind center grille)
• Turn b/u fuse 16 20a

Power Mirror Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Power Mirror Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (except upper level)
• (inside left front door harness)
• (inside right front door harness)
• (right side of dash) g201
• (upper level)
• Automatic day-night sensor (upper level)
• C a
• Ctsy fuse 3 20a
• D d
• Defogger system (heated mirror)
• Down
• E c
• Electro- chromic mirror circuit
• F b
• Heating element (upper level)
• Hot at all times
• I/p fuse block
• Interior lights system
• Left
• Left power outside rearview mirror
• Left/ right motor
• Pnk
• Power outside rearview mirror switch
• Right
• Right power outside rearview mirror
• S248
• S251
• S503
• Up/ down motor

POWER SEATS

6-Way Power Seat Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6-Way Power Seat Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (regular/extended cab) (except regular extended cab)
• (right side of dash)
• Back
• Forward/ rearward motor
• Front dn
• Front tilt motor
• Front up
• Fwd
• G201
• Hot at all times
• I/p fuse block
• Left power seat adjuster switch
• Pwr-accy circuit breaker 20a 30a
• Rear dn
• Rear tilt motor
• Rear up
• Right power seat adjuster switch
• S227
• S228
• S255
• Tan

Front Seat Heater Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Front Seat Heater Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (cross body harn, left side of dash, near convenience center)
• (left heated seat harn, near heated seat control module breakout)
• (not used)
• Batt
• C236
• Convenience center
• Front heated seats fuse 20a
• G201 (right side of dash)
• Gnd
• Heated seat sw sig
• High/low sig
• Hot at all time
• Hot in run
• I/p fuse block
• Indicator lmp feed
• Left front heated seat module (under left front power seat)
• Left front heated seat switch
• Left front seat back element
• Left front seat cushion
• Left front seat cushion element
• Left front seat temper- ature sensor
• Off
• Right front heated seat module (under right front power seat)
• Right front heated seat switch
• Right front seat back element
• Right front seat bealt switch
• Right front seat cushion
• Right front seat cushion element
• Right front seat temper- ature sensor
• Rr hvac fuse 5 10a
• S227
• S233
• S238
• S259
• S273
• S274
• S277
• S278
• Sig enable
• Underhood fuse/relay center

Lumbar Wiring Diagram, with Bucket Seat for GMC Cab & Chassis C2000 3500

List of elements for Lumbar Wiring Diagram, with Bucket Seat for GMC Cab & Chassis C2000 3500:

• (w/ regular/extended cab) (except regular extended cab)
• C210 c
• Convenience center
• G201 (right side of dash)
• Hot at all times
• I/p fuse block
• Left front power lumbar seat switch
• Left front power lumbar support motor
• Left lumbar solenoid
• Pwr-accy circuit breaker 20a 30a
• Right front power lumbar seat switch
• Right front power lumbar support motor
• Right lumbar solenoid
• S227
• S228
• S237
• S241
• S259
• Tan

Lumbar Wiring Diagram, without Bucket Seat for GMC Cab & Chassis C2000 3500

List of elements for Lumbar Wiring Diagram, without Bucket Seat for GMC Cab & Chassis C2000 3500:

• C210 b
• Cig ltr fuse 13 20a
• Convenience center
• G201 (right side of dash)
• Hot at all times
• I/p fuse block
• Left front power lumbar seat switch
• Left front power lumbar support motor
• Left lumbar solenoid
• Red
• Right front power lumbar seat switch
• Right front power lumbar support motor
• Right lumbar solenoid
• S227
• S228
• S256
• S259
• S264 (suburban utility only)
• Tan
• W/ split bench seat
• W/o split bench seat

POWER WINDOWS

Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis C2000 3500

List of elements for Power Window Wiring Diagram, 2 Door for GMC Cab & Chassis C2000 3500:

• Auto window down module
• Convenience center (under left side of dash)
• Down
• G201 (right side of dash)
• Hot in run
• I/p fuse block (under left side of dash)
• Interior lights system
• Left front
• Left front window motor
• Left power window master switch
• Pwr wdo circuit breaker 30a
• Right front
• Right front window motor
• Right front window switch
• S251
• S259
• S266
• S500
• S501
• Solid state
• Tan

Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis C2000 3500

List of elements for Power Window Wiring Diagram, 4 Door for GMC Cab & Chassis C2000 3500:

• Convenience center (under left side of dash)
• Down
• G201 (right side of dash)
• Headlamp & panel dimmer switch
• Hot at all times
• Hot in run
• I/p fuse block (under left side of dash)
• Left front
• Left front power window master switch
• Left front window motor
• Left rear
• Left rear window motor
• Left rear window switch
• Pk lps fuse 20a
• Pwr wdo circuit breaker 30a
• Right front
• Right front window motor
• Right front window switch
• Right rear
• Right rear window motor
• Right rear window switch
• S247 (crossbody harn, approx 6 cm into left door harn breakout)
• S251
• S259
• S263
• S500
• S501
• S502 (inside left front door harness, approx 4 cm from tweeter breakout)
• Solid state
• Tan
• Window lockout switch

RADIO

Radio Wiring Diagrams, with Amplifier for GMC Cab & Chassis C2000 3500

List of elements for Radio Wiring Diagrams, with Amplifier for GMC Cab & Chassis C2000 3500:

• (left side of dash) data link connector
• (lf door harn, near window reg breakout)
• (rf door harn, near door lock motor breakout)
• Amp feed
• Antenna
• Audio rtn
• Bare
• Battery
• Cig ltr fuse 13 20a
• Diesel
• Dim
• Dim feed
• Display dim
• Drain rtn
• E&c diag
• Fuse out
• G201 (right side of dash)
• G202 (left side of dash)
• Gas
• Ground
• Hot at all times
• Hot in acc or run
• I/p fuse block
• Interior lights system
• Left front speaker
• Left front tweeter
• Left rear door speaker
• Left rear speaker
• Lf +
• Lf -
• Lr +
• Lr dr +
• Lr dr -
• Lr _
• Lr+
• Lr-
• Lt audio
• Lt remote
• Nca
• Pnk
• Power amplifier (under left side of dash)
• Power amplifier relay (under left side of dash)
• Radio
• Radio batt fuse 19 10a
• Radio fuse 17 10a
• Red
• Remote audio player
• Remote rtn
• Rf +
• Rf -
• Right front speaker
• Right front tweeter
• Right rear door speaker
• Right rear speaker
• Rly sig
• Rr +
• Rr -
• Rr dr +
• Rr dr -
• Rr+
• Rr-
• Rt audio
• Rt remote
• S221
• S249
• S250
• S251
• S252
• S254
• S256
• S259
• S298
• S504
• S505
• S603
• S604
• Serial data
• Tan
• Tape ctrl
• Vehicle control module (left side of engine compartment)
• Vehicle speed sensor buffer (behind right side of dash)
• Vss signal

Radio Wiring Diagrams, without Amplifier for GMC Cab & Chassis C2000 3500

List of elements for Radio Wiring Diagrams, without Amplifier for GMC Cab & Chassis C2000 3500:

• (left side of dash) data link connector
• (lf door harn, near window reg breakout)
• (rf door harn, near door lock motor breakout)
• Amp feed
• Antenna
• Audio rtn
• Bare
• Battery
• Diesel
• Dim
• Dim feed
• Display dim
• Drain rtn
• E&c diag
• Fuse out
• G202 (left side of dash)
• Gas
• Ground
• Hot at all times
• Hot in acc or run
• I/p fuse block
• Interior lights system
• Left front speaker
• Left front tweeter
• Left rear speaker
• Lf +
• Lf -
• Lr +
• Lr _
• Lt audio
• Lt remote
• Nca
• Pnk
• Radio
• Radio batt fuse 19 10a
• Radio fuse 17 10a
• Remote audio player
• Remote rtn
• Rf +
• Rf -
• Right front speaker
• Right front tweeter
• Right rear speaker
• Rr +
• Rr -
• Rt audio
• Rt remote
• S221
• S298
• S504
• S505
• S603
• S604
• Serial data
• Tan
• Tape ctrl
• Vehicle control module (left side of engine compartment)
• Vehicle speed sensor buffer (behind right side of dash)
• Vss signal

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Shift Interlock Wiring Diagram for GMC Cab & Chassis C2000 3500:

• Automatic transmission shift lock control (btsi) solenoid (right side of steering column)
• G202 (behind left side of dash)
• Hot in run or start
• I/p fuse block
• Park/ neutral position switch (left side of transmission)
• Pnk
• S204
• Transfer case control module (under dash on steering column support bracket)
• Turn/ hazard switch
• Turn/bu fuse 16 20a
• W/ electric shift transfer case

STARTING/CHARGING

5.7L

5.7L VIN R, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (dash harness, approximately 4 cm (1.5 in) from steering pnk
• (on right front of engine block) g119
• (right front wheelhouse) g101
• 175a
• All others
• Battery
• Charge warning indicator
• Column harness breakout, towards data link connector) s213
• Fusible link
• Gauges fuse 4 20a
• Generator
• Hot in run & start
• I/p fuse block (under left side of dash)
• Instrument cluster
• Mega fuse block (on right front of engine compartment, near battery)
• Pnk
• Power distribution system
• Red
• Uplevel/ enhanced

5.7L VIN R, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (on left rear of engine compartment) fuse/relay block
• 175a
• A/t
• Acc
• Battery
• Bulb test
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 8 10a
• G101 (right front wheel house)
• G119 (on right front of engine block)
• I/p fuse block (under left side of dash)
• Ign a fuse 6 40a
• Ignition switch
• Lock
• M/t
• Mega fuse block (on right front of engine compartment, near battery)
• Off
• Park/ neutral position switch (on left side, center of transmission)
• Red
• Remote battery stud
• Run
• S107
• Start
• Starter motor
• Starter relay
• Starter solenoid

6.5L

6.5L VIN F, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (alternator jumper harness, approximately 18 cm (7 in) from right generator)
• 100a b
• 100a/105a b
• 124a l
• 175a
• All others
• Charge warning indicator
• Fusible link
• G101 (right front wheelhouse)
• G110 (left front of intake manifold)
• G117 (right rear of cylinder head)
• Gauges fuse 4 10a
• Generator
• Generator (w/ dual generators)
• Hot in run & start
• I/p fuse block (under left side of dash)
• Instrument cluster
• Left battery
• Mega fuse block (right front of engine compt, near battery)
• Nca
• Pnk
• Power distribution system
• Red
• Right battery
• S213
• Uplevel/ enhanced

6.5L VIN F, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500:

• A/t
• Acc
• Bulb test
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 8 10a
• Fuse/relay block (on left rear of engine compartment)
• G101 (right front wheel- house)
• G110 (left front of intake manifold)
• G117 (right rear of cylinder head)
• I/p fuse block (under left side of dash)
• Ign a fuse 6 40a
• Ignition switch
• Left battery
• Lock
• M/t
• Off
• Park/ neutral position switch (on left side, center of transmission)
• Red
• Remote battery stud
• Right battery
• Run
• S107
• Start
• Starter motor
• Starter relay
• Starter solenoid

7.4L

7.4L VIN J, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Charging Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (dash harness, approximately 4 cm (1.5 in) from steering pnk
• (on right front of engine block) g119
• (right front wheelhouse) g101
• 175a
• All others
• Battery
• Charge warning indicator
• Column harness breakout, towards data link connector) s213
• Fusible link
• Gauges fuse 4 20a
• Generator
• Hot in run & start
• I/p fuse block (under left side of dash)
• Instrument cluster
• Mega fuse block (on right front of engine compartment, near battery)
• Pnk
• Power distribution system
• Red
• Uplevel/ enhanced

7.4L VIN J, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, Starting Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (on left rear of engine compartment) fuse/relay block
• 175a
• A/t
• Acc
• Battery
• Bulb test
• Clutch pedal position switch (on top of clutch pedal bracket)
• Crank fuse 8 10a
• G101 (right front wheel house)
• G119 (on right front of engine block)
• I/p fuse block (under left side of dash)
• Ign a fuse 6 40a
• Ignition switch
• Lock
• M/t
• Mega fuse block (on right front of engine compartment, near battery)
• Off
• Park/ neutral position switch (on left side, center of transmission)
• Red
• Remote battery stud
• Run
• S107
• Start
• Starter motor
• Starter relay
• Starter solenoid

SUPPLEMENTAL RESTRAINTS

Supplemental Restraint Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Supplemental Restraint Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (behind left kick panel) g200
• (behind left kick panel) g202
• (behind left side of dash) g202
• (crossbody harness, approximately 7 cm (2.5 inches) into seat belt switch) s259
• (i/p harness, approximately 16 cm (6 inches) from instrument cluster harness, breakout, towards cigar lighter harness breakout) s218
• (i/p harness, approximately 4 cm (1.5 inches) from steering column harness breakout, towards data link connector (dlc)) s213
• (sir harness, 35 cm (13.5 inches) before inflatable restraint sensing & diagnostic module (sdm) s276
• (sir harness, 35 cm (13.5 inches) before mobile communications, system wire breakout, towards inflatable restraint sensing & diagnostic module (sdm))
• Air bag fuse 10 10a
• Air bag indicator
• Air bag indicator ctrl
• Audio alarm module
• Convenience center (under left side of dash)
• Data link connector (dlc) (partial) (under left side of dash, left of steering column)
• Disc sensor input
• Driver seat belt
• Driver side high
• Driver side low
• Gauges fuse 4 10a
• Ground
• Hot in run & start
• I/p fuse block (under left side of dash)
• Ignition
• Inflatable restraint front end discriminating sensor (under front outside center of radiator)
• Inflatable restraint ip module
• Inflatable restraint ip module switch (pick up only)
• Inflatable restraint sensing & diagnostic module (sdm) (under driver's seat carpet)
• Inflatable restraint steering wheel module
• Inflatable restraint steering wheel module coil
• Instrument cluster
• Interior lights system
• Off
• Ohms
• Pass airbag disable
• Pass airbag enable
• Pass side high
• Pass side low
• Pnk
• S282
• Seat belt switch (closed w/seat belt unbuckled) (on driver's seat belt buckle)
• Serial data (uart)
• Shorting bar
• Tan
• W/luxury package
• W/o luxury package

TRANSMISSION

5.7L

5.7L VIN K, A/T Wiring Diagram, 4L60-E for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN K, A/T Wiring Diagram, 4L60-E for GMC Cab & Chassis C2000 3500:

• (dash harn, 20 cm from breakout to inflatable restraint sw)
• (engine harn, 16 cm from egr breakout)
• (engine harn, 6.5 cm from breakout to ebcm)
• (on brake pedal bracket) stoplamp switch
• 1-2 shift sol
• 1-2 shift solenoid
• 2-3 shift sol
• 2-3 shift solenoid
• 2wd
• 3-2 ctrl solenoid
• 3-2 downshift sol
• 4wd
• 4wd circuit (transfer case & axle switches)
• 4wd low signal in
• 5v reference
• Anti-lock brakes system
• Automatic transmission (4l60-e)
• Battery in
• Brake fuse 18 10a
• Brake switch input
• Breakout to egr valve)
• Cruise control
• D3, d2
• D4, d2
• Data class ii
• Data link connector (under left side of dash)
• Ecm 1 fuse 20a
• Ecm b fuse 20a
• Ect sens input
• Electronic brake control module
• Engine controls
• Engine coolant temperature sensor (top right front of engine)
• Fluid temp sensor
• Front wheel lock
• Fuel injectors, ignition control moudule & ignition coil
• Fuel pump & oil press switch/ sender & fuel pump relay
• G120 (right rear of cylinder head)
• Gauges fuse 4 10a
• Hot at all times
• Hot in off, run or start
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition in
• Inline gender adaptor
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl solenoid
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• Rev, lo
• S101
• S103
• S150 (engine harn, 13 cm from breakout to ebcm)
• S151
• S152
• S161
• S213
• S222
• S231
• Sensor ground
• Sensor return
• Tan
• Tcc pwm sol
• Tcc pwm solenoid
• Tcc sol
• Tcc solenoid
• Tcc/abs/ cruise switch
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fuse 20 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Transfer case circuit
• Underhood fuse/relay center (left rear of engine compt)
• Vehicle control module (left side of engine compt)
• Vehicle speed sensor (left side of transmission-2wd) (left side of transfer case-4wd)
• Vss hi (signal)
• Vss lo (ground)

5.7L VIN R, A/T Wiring Diagram, 4L60-E for GMC Cab & Chassis C2000 3500

List of elements for 5.7L VIN R, A/T Wiring Diagram, 4L60-E for GMC Cab & Chassis C2000 3500:

• (dash harn, 20 cm from breakout to inflatable restraint sw)
• (engine harn, 16 cm from egr breakout)
• (engine harn, 6.5 cm from breakout to ebcm)
• (on brake pedal bracket) stoplamp switch
• 1-2 shift sol
• 1-2 shift solenoid
• 2-3 shift sol
• 2-3 shift solenoid
• 2wd
• 3-2 ctrl solenoid
• 3-2 downshift sol
• 4wd
• 4wd circuit (transfer case & axle switches)
• 4wd low signal in
• 5v reference
• Anti-lock brakes system
• Automatic transmission (4l60-e)
• Battery in
• Brake fuse 18 10a
• Brake switch input
• Breakout to egr valve)
• Cruise control
• D3, d2
• D4, d2
• Data class ii
• Data link connector (under left side of dash)
• Ecm 1 fuse 20a
• Ecm b fuse 20a
• Ect sens input
• Electronic brake control module
• Engine controls
• Engine coolant temperature sensor (top right front of engine)
• Fluid temp sensor
• Front wheel lock
• Fuel injectors, ignition control moudule & ignition coil
• Fuel pump & oil press switch/ sender & fuel pump relay
• G120 (right rear of cylinder head)
• Gauges fuse 4 10a
• Hot at all times
• Hot in off, run or start
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition in
• Inline gender adaptor
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl solenoid
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• Rev, lo
• S101
• S103
• S150 (engine harn, 13 cm from breakout to ebcm)
• S151
• S152
• S161
• S213
• S222
• S231
• Sensor ground
• Sensor return
• Tan
• Tcc pwm sol
• Tcc pwm solenoid
• Tcc sol
• Tcc solenoid
• Tcc/abs/ cruise switch
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fuse 20 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Transfer case circuit
• Underhood fuse/relay center (left rear of engine compt)
• Vehicle control module (left side of engine compt)
• Vehicle speed sensor (left side of transmission-2wd) (left side of transfer case-4wd)
• Vss hi (signal)
• Vss lo (ground)

6.5L

6.5L VIN F, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis C2000 3500

List of elements for 6.5L VIN F, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis C2000 3500:

• (dash harn, 16 cm from cluster breakout)
• (engine harn, 4 cm fromt breakout to cluster)
• (on brake pedal bracket) stoplamp switch
• (top rear of right cyl head)
• 1-2 shift sol
• 1-2 shift solenoid
• 2-3 shift sol
• 2-3 shift solenoid
• 2wd
• 4wd
• 4wd sig
• A/t iss sens hi
• A/t iss sens in
• A/t iss sens lo
• A/t iss sensor
• A12
• Accelerator pedal position module (part of accelerator pedal)
• App 1 5v ref
• App 1 signal in
• App 2 5v ref
• App 2 signal in
• App 3 5v ref
• App 3 signal in
• Automatic transmission (4l80-e)
• Automatic transmission input shaft speed sensor (left front of transmission)
• B10
• B12
• Battery in
• Brake fuse 18 10a
• Brake switch in
• C11
• C12
• C13
• C14
• C15
• Class ii data
• D11
• D12
• D13
• D3, d2
• D4, d2
• Data link connector (under left side of dash)
• Ecm 1 fuse 20a
• Ecm b fuse 20a
• Ect sensor in
• Electronic brake control module
• Engine controls system
• Engine coolant temperature sensor (near thermostat housing)
• Engine shutoff solenoid, fuel solenoid
• Exterior lights
• From breakout to steering column)
• Fuel pump & oil press switch/ sender & fuel pump relay
• G117
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• Ignition in
• Inline gender adaptor
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Power
• Powertrain control module (right side of dash near blower motor)
• Press ctrl solenoid
• Red
• Rev, lo
• S101
• S103
• S140
• S150 (engine harn, 13 cm from breakout to ebcm)
• S152
• S166
• S170
• S211
• S213
• S215
• S299
• Sensor ground
• Stop/haz fuse 1 20a
• Stoplamp switch
• Tan
• Tcc pwm sol
• Tcc pwm solenoid
• Tft sensor in
• Trans fluid temp sensor
• Trans fuse 20 20a
• Trans range
• Trans range "a"
• Trans range "b"
• Trans range "c"
• Trans range pressure switch assembly
• Transfer case circuit
• Turn/ hazard switch & chime module
• Underhood fuse/relay center (left rear of engine compt)
• Vehicle speed sensor (left side of transmission-2wd left side of transfer case-4wd)
• Vehicle speed sensor buffer (right side of dash)
• Vss hi (signal)
• Vss in
• Vss lo (ground)
• Vss out

7.4L

7.4L VIN J, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis C2000 3500

List of elements for 7.4L VIN J, A/T Wiring Diagram, 4L80-E for GMC Cab & Chassis C2000 3500:

• (5.7l) (7.4l)
• (dash harn, 20 cm from breakout to inflatable restraint sw)
• (engine harn, 16 cm from egr breakout)
• (engine harn, 6.5 cm from breakout to ebcm)
• (on brake pedal bracket) stoplamp switch
• 1-2 shift sol
• 1-2 shift solenoid
• 2-3 shift sol
• 2-3 shift solenoid
• 2wd
• 4wd
• 4wd circuit (transfer case & axle switches)
• 4wd low signal in
• 5v reference
• A/t iss hi in
• A/t iss lo in
• Anti-lock brakes system
• Automatic transmission (4l80-e)
• Automatic transmission input shaft speed sensor (if equipped) (on transmission)
• Battery in
• Brake fuse 18 10a
• Brake switch input
• Breakout to egr valve)
• Cruise control
• D3, d2
• D4, d2
• Data class ii
• Data link connector (under left side of dash)
• Ecm 1 fuse 20a
• Ecm b fuse 20a
• Ect sens input
• Electronic brake control module
• Engine controls
• Engine coolant temperature sensor (top right front of engine)
• Fluid temp sensor
• Front wheel lock
• Fuel injectors, ignition control moudule & ignition coil
• Fuel pump & oil press switch/ sender & fuel pump relay
• G120 (top of right cylinder head)
• Gauges fuse 4 10a
• Hot at all times
• Hot in off, run or start
• Hot in run
• Hot in run or start
• I/p fuse block (under left side of dash)
• I/p fuse block (under left side of dsah)
• Ignition in
• Inline gender adaptor
• Instrument cluster
• Malfunction indicator lamp
• Mil control
• Pcm ground
• Pcs sol hi out
• Pcs sol lo out
• Pnk
• Press ctrl solenoid
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• Rev, lo
• S101
• S103
• S150 (engine harn, 13 cm from breakout to ebcm)
• S151
• S152
• S161 s104
• S213
• S222
• S231
• Sensor ground
• Sensor return
• Tan
• Tcc pwm sol
• Tcc pwm solenoid
• Tcc/abs/ cruise switch
• Throttle position sensor (mounted to side of throttle body)
• Tp sens input
• Trans fuse 20 10a
• Trans range pressure switch assembly
• Trans temp sig in
• Transfer case circuit
• Underhood fuse/relay center (left rear of engine compt)
• Vehicle control module (left side of engine compt)
• Vehicle speed sensor (left side of transmission-2wd) (left side of transfer case-4wd)
• Vss hi (signal)
• Vss lo (ground)

WARNING SYSTEMS

Warning System Wiring Diagrams, Base for GMC Cab & Chassis C2000 3500

List of elements for Warning System Wiring Diagrams, Base for GMC Cab & Chassis C2000 3500:

• (behind left side of dash)
• (near thermostat housing)
• (opens with belt buckled)
• Audio alarm module (on convenience center)
• Diesel
• Fasten belts out
• G119
• G134 (front top of engine)
• G134 (right top center of cylinder head)
• G201 (right side of dash)
• G202
• Gas
• Gauges fuse 4 10a
• Ground
• Hot at all times
• Hot in park or headlight
• Hot in run, bulb test, or start
• I/p fuse block (under left side of dash)
• Ignition on input
• Illum fuse 14 10a
• Instru- ment cluster
• Key-in warning
• Key-in warning buzzer switch (left side of steering column)
• Left front door jamb switch
• Lights on input
• Pnk
• Power input
• S103
• S204
• S213
• S215
• S217
• S259
• S298
• S299
• Safety belts indicator
• Seat belt input
• Seat belt switch (on driver's seat belt buckle)
• Stop/haz fuse 1 20a
• Tan

Warning System Wiring Diagrams, Luxury & Performance for GMC Cab & Chassis C2000 3500

List of elements for Warning System Wiring Diagrams, Luxury & Performance for GMC Cab & Chassis C2000 3500:

• (behind left side of dash)
• (near thermostat housing)
• (opens with belt buckled)
• B tan
• Battery input
• Body control module (in center console)
• C13
• C14
• Ctsy fuse 3 20a
• D11
• D15
• Distribution
• Drvr dr ajar sw
• Fasten belts out
• G119
• G134 (right top center of cylinder head)
• G201 (right side of dash)
• G202
• Gauges fuse 4 10a
• Ground
• Headlamp & panel dimmer switch
• Hot at all times
• Hot in run, or start
• I/p fuse block (under left side of dash)
• Instru- ment cluster
• Key-in warning
• Key-in warning buzzer switch (left side of steering column)
• Left door jamb switch
• Park lamp input
• Pklps fuse 9 20a
• Pnk
• Power
• S103
• S204
• S210 (near convenience center)
• S213
• S215
• S259
• S335
• S336
• Safety belts indicator
• Seat belt input
• Seat belt switch (on driver's seat belt buckle)
• Switched ignition
• System
• Tan

WIPER/WASHER

Wiper/Washer Wiring Diagram for GMC Cab & Chassis C2000 3500

List of elements for Wiper/Washer Wiring Diagram for GMC Cab & Chassis C2000 3500:

• (left radiator support, near left headlamp) g108
• Delay
• Front windshield washer pump (in washer fluid reservoir)
• Front wiper motor module (on center of firewall)
• G202 (behind left side of dash)
• High
• Hot in accy & run
• I/p fuse block (under left side of dash)
• Inst wipe
• Low
• Mist
• Nca
• Off
• Red
• Red a
• S204
• Solid state
• Wash
• Windshield wiper/ washer switch
• Wiper control
• Wiper fuse 25a