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Air Conditioning — GMC Cab & Chassis Sierra 3500 HD 2012 Wiring Diagram

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Automatic A/C Wiring Diagram (1 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

Automatic A/C Wiring Diagram (2 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Automatic A/C Wiring Diagram (2 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

Automatic A/C Wiring Diagram (3 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Automatic A/C Wiring Diagram (3 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

Manual A/C Wiring Diagram (1 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Manual A/C Wiring Diagram (1 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

Manual A/C Wiring Diagram (2 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Manual A/C Wiring Diagram (2 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

Manual A/C Wiring Diagram (3 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012

List of elements for Manual A/C Wiring Diagram (3 of 3) for GMC Cab & Chassis Sierra 3500 HD 2012:

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

AIR CONDITIONING – GMC Cab & Chassis Sierra 3500 HD 2012 – SYSTEM WIRING DIAGRAMS