AIR CONDITIONING – Chevrolet Chevy Express G3500 2009 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Compressor Wiring Diagram for Chevrolet Chevy Express G3500 2009

List of elements for Compressor Wiring Diagram for Chevrolet Chevy Express G3500 2009:

• 4.3l
• 4.8l, 5.3l & 6.0l
• 5v ref
• 6.6l
• A/c cmprsr fuse 57 15a
• A/c compressor clutch (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine)
• A/c comprsr relay 74
• A/c low pressure switch (on side of accumulator)
• A/c refrigerant pressure sensor
• A/c request sig
• Bi-lev
• Body control module (bcm) (behind lower right side of dash)
• Body fuse block (under left front seat)
• Clutch rly ctrl
• Computer data lines system
• Def
• Engine control module (ecm) (left side of engine compt)
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G304 (behind right kick panel)
• Gmlan (+)
• Gmlan (-)
• Heat
• Heat/def
• Hot at all times
• Hot w/ run relay energized
• Hvac 2 fuse 1 10a
• Hvac control assembly
• J102
• J249
• Logic
• Low ref
• Max norm
• Off
• Press sens
• Tan
• Underhood fuse block (on left side of engine compt)
• Vent
• W/ electric rear window defogger & power mirrors

Heater Wiring Diagram for Chevrolet Chevy Express G3500 2009

List of elements for Heater Wiring Diagram for Chevrolet Chevy Express G3500 2009:

• (in body harness, attached to lower left "b" pillar) splice block jx347
• (in chassis harness, 15 cm from coolant heater breakout) j119
• (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout)
• (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout)
• 12v ref
• 5v ref
• Air temperature actuator (behind right side of dash, on hvac)
• Auxiliary blower motor (if equipped) (on auxiliary hvac)
• Auxiliary blower motor high speed relay (if equipped) (left rear of passenger compt, attached to hvac module)
• Auxiliary blower motor low speed relay (if equipped) (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor medium speed relay (if equipped) (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor resistor assembly (if equipped) (on auxiliary heater motor)
• Auxiliary blower motor switch (if equipped)
• Bi-lev
• Blower motor (on right rear of engine compt, on evaporator case)
• Blower motor relay
• Blower motor resistor assembly (at right rear of engine compt, on evaporator case)
• Body control module (bcm) (behind lower right side of dash)
• Body fuse block (under left front seat)
• Computer data lines system
• Coolant heater (6.6l w/ auxiliary fuel fired heater) (attached to the left front inner frame rail)
• Coolant heater air temperature sensor
• Coolant heater blower motor
• Coolant heater combustion sensor
• Coolant heater control module
• Coolant heater fuel pump (attached to the left inner frame rail, near the fuel pump assembly)
• Coolant heater glow plug
• Coolant heater overheat temperature sensor
• Coolant heater temperature sensor
• Def
• Electronic brake control module (ebcm) (on left frame rail, near center of vehicle)
• Foh mdl (d) fuse 14 15a
• Frt blwr fuse 66 40a
• Fuel pump
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G102 (left front lower side of the engine block)
• G304 (behind right kick panel)
• G347
• G400 (on inner left rear frame rail)
• G402 (on top of
• Gnd
• Heat
• Heat/def
• Hot at all times
• Hot w/ run relay energized
• Hvac 1 fuse 5 20a
• Hvac 2 fuse 1 10a
• Hvac control assembly
• Interior
• Interior lights system
• J102
• J249
• J401
• J402
• J405
• J412
• J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout)
• Left "d" pillar)
• Lights system
• Logic
• Low ref
• Max
• Med
• Norm
• Off
• Rear blwr fuse 37 30a
• Red
• Ser data
• Serial +
• Serial -
• Tan
• Underhood fuse block (on left side of engine compt)
• Vacuum pump (6.6l) (right front of engine compt, under battery)
• Vent
• Volt
• W/ auxiliary fuel fired heater
• W/o auxiliary fuel fired heater

Manual A/C Wiring Diagram, Cargo Van (1 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Cargo Van (1 of 3) for Chevrolet Chevy Express G3500 2009:

• (behind right kick panel) g304
• (behind right side of dash, on hvac) air temperature actuator
• Bi-lev
• Blower motor (on right rear of engine compt, on evaporator case)
• Blower motor relay
• Blower motor resistor assembly (at right rear of engine compt, on evaporator case)
• Body fuse block (under left front seat)
• Def
• Defogger control ind
• Defogger switch
• Defogger system
• Front auxiliary hvac control assembly
• Frt blwr fuse 66 40a
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G102 (left front lower side of the engine block)
• G348
• Heat
• Heat/def
• Hot at all times
• Hot w/ run relay energized
• Hvac 1 fuse 5 20a
• Hvac 2 fuse 1 10a
• Hvac cntrl fuse 12 10a
• Hvac control assembly
• Interior lights system
• J102
• J249
• J314
• Logic
• Max
• Med
• Norm
• Off
• Rear blwr fuse 37 30a
• Red
• Splice block jx348 (attached to lower right "b" pillar part of g348)
• Tan
• Underhood fuse block (on left side of engine compt)
• Vacuum pump (6.6l) (right front of engine compt, under battery)
• Vent
• W/ electric rear window defogger & power mirrors

Manual A/C Wiring Diagram, Cargo Van (2 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Cargo Van (2 of 3) for Chevrolet Chevy Express G3500 2009:

• (attached to the left inner frame rail, near the fuel pump assembly) coolant heater fuel pump
• (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405
• (w/o rv upfitter: in body harness, 31 cm from x304 breakout) (w/ rv upfitter: in body harness, 32 cm from x308 breakout)
• 5v ref
• A/c low pressure switch (on side of accumulator)
• Auxiliary air temperature actuator
• Auxiliary blower motor (on auxiliary hvac)
• Auxiliary blower motor high speed relay (left rear of passenger compt, attached to hvac module)
• Auxiliary blower motor low speed relay (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor medium speed relay (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor resistor (on auxiliary heater motor)
• Auxiliary mode actuator
• Computer data lines system
• Coolant heater (6.6l w/ auxiliary fuel fired heater) (attached to the left front inner frame rail)
• Coolant heater air temperature sensor
• Coolant heater blower motor
• Coolant heater combustion sensor
• Coolant heater control module
• Coolant heater glow plug
• Coolant heater overheat temperature sensor
• Coolant heater temperature sensor
• Foh mdl (d) fuse 14 15a
• Fuel pump
• G400 (on inner left rear frame rail)
• G402 (on top of
• Gnd
• Hot at all times
• J308 (w/o rv upfitter: in body harness, 5 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout)
• J310
• J311 (w/o rv upfitter: in body harness, 41 cm from x304 breakout) (w/ rv upfitter: in body harness, 22 cm from x308 breakout)
• J402
• J411
• J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout)
• J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout)
• Left "d" pillar)
• Logic
• Low ref
• Provisional
• Serial +
• Serial -
• Serial data
• Tan
• Underhood fuse block (on left side of engine compt)
• Volt
• Volt +
• X319

Manual A/C Wiring Diagram, Cargo Van (3 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Cargo Van (3 of 3) for Chevrolet Chevy Express G3500 2009:

• (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine) a/c compressor clutch
• (in chassis harness, 15 cm from coolant heater breakout) j119
• + - gmlan data
• 12v ref
• 4.3l
• 4.8l, 5.3l & 6.0l
• 5v ref
• 5v ref 1
• 6.6l
• A/c cmprsr fuse 57 15a
• A/c comprsr relay 74
• A/c refrigerant pressure sensor
• A/c request sig
• Body control module (bcm) (behind lower right side of dash)
• Clutch ctrl
• Clutch rly ctrl
• Computer data lines system
• Cooling fan assembly (6.6l) (behind radiator)
• Electronic brake control module (ebcm) (on left frame rail, near center of vehicle)
• Engine control module (ecm) (left side of engine compt)
• Engine coolant temperature (ect) sensor (4.8l, 5.3l & 6.0l: at left front of engine) (4.3l: on left side of engine) (6.6l turbo: top of engine, near thermostat housing)
• Fan cltch (d) fuse 58 10a
• Fan cltch (d) relay 75 (6.6l)
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G102 (left front lower side of the engine block)
• Gmlan (+)
• Gmlan (-)
• Hot at all times
• Hot w/ pwr/trn relay energized
• J102
• Low ref
• Press sens
• Sens sig
• Serial data
• Speed sig
• Tan
• Underhood fuse block (on left side of engine compt)
• W/ auxiliary fuel fired heater
• W/o auxiliary fuel fired heater

Manual A/C Wiring Diagram, Passenger Van (1 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Passenger Van (1 of 3) for Chevrolet Chevy Express G3500 2009:

• (19 cm from x303 breakout)
• (39 cm from x303 breakout)
• (64 cm from x303 breakout)
• (behind right kick panel) g304
• (behind right side of dash, on hvac) air temperature actuator
• (in upfitter hvac control harness, 88 cm from x303 breakout)
• Auxiliary hvac control processor (w/ rv upfitter & swb passenger) (center front of headliner)
• Bi-lev
• Blower motor (on right rear of engine compt, on evaporator case)
• Blower motor relay
• Blower motor resistor assembly (at right rear of engine compt, on evaporator case)
• Body fuse block (under left front seat)
• Def
• Defogger ind
• Defogger switch
• Defogger system
• Front auxiliary hvac control assembly
• Frt blwr fuse 66 40a
• Frt blwr sw ctrl
• Frt mode dr ctrl
• Frt temp dr ctrl
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G102 (left front lower side of the engine block)
• G348
• G401 (on top of right "d" pillar)
• Gnd
• Heat
• Heat/def
• Hot at all times
• Hot w/ run relay energized
• Hvac 1 fuse 5 20a
• Hvac 2 fuse 1 10a
• Hvac cntrl fuse 12 10a
• Hvac control assembly
• Ign
• Interior lights system
• J102
• J249
• J305
• J306
• J307
• J314
• J330
• J354
• Logic
• Max
• Med
• Mode dr ctrl
• Norm
• Off
• Rear
• Rear auxiliary hvac control assembly
• Rear blwr fuse 37 30a
• Rear blwr sw ctrl
• Rear mode dr ctrl
• Rear temp dr ctrl
• Red
• Splice block jx348 (attached to lower right "b" pillar part of g348)
• Tan
• Temp dr ctrl
• Underhood fuse block (on left side of engine compt)
• Vacuum pump (6.6l) (right front of engine compt, under battery)
• Vent
• W/ electric rear window defogger & power mirrors
• W/ rv upfitter
• W/o rv upfitter

Manual A/C Wiring Diagram, Passenger Van (2 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Passenger Van (2 of 3) for Chevrolet Chevy Express G3500 2009:

• (attached to the left
• (attached to the left inner frame rail, near the fuel pump assembly) coolant heater fuel pump
• (in rear hvac harness, 13 cm from auxiliary blower motor connector breakout) j405
• (w/ rv upfitter: in body harness, 22 cm from x308 breakout)
• (w/ rv upfitter: in body harness, 32 cm from x308 breakout)
• 5v ref
• A/c low pressure switch (on side of accumulator)
• Auxiliary air temperature actuator (on auxiliary hvac assembly)
• Auxiliary blower motor (on auxiliary hvac)
• Auxiliary blower motor high speed relay (left rear of passenger compt, attached to hvac module)
• Auxiliary blower motor low speed relay (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor medium speed relay (left rear of passenger compt, attached to auxiliary hvac module)
• Auxiliary blower motor resistor assembly (on auxiliary heater motor)
• Auxiliary mode actuator
• Computer data lines system
• Coolant heater (6.6l w/ auxiliary fuel fired heater)
• Coolant heater air temperature sensor
• Coolant heater blower motor
• Coolant heater combustion sensor
• Coolant heater control module
• Coolant heater glow plug
• Coolant heater overheat temperature sensor
• Coolant heater temperature sensor
• Foh mdl (d) fuse 14 15a
• Front inner frame rail)
• Fuel pump
• G400 (on inner left rear frame rail)
• G402 (on top of
• Gnd
• Hot at all times
• J308 (w/o rv upfitter: in body harness, 5 cm from x304 breakout)
• J310
• J311
• J402
• J411
• J412 (in rear hvac harness, 20 cm from auxiliary blower motor connector breakout)
• J413 (in rear hvac harness, 24 cm from auxiliary blower motor breakout)
• Left "d" pillar)
• Logic
• Low ref
• Provisional
• Serial +
• Serial -
• Serial data
• Tan
• Underhood fuse block (on left side of engine compt)
• Volt
• Volt +
• X319

Manual A/C Wiring Diagram, Passenger Van (3 of 3) for Chevrolet Chevy Express G3500 2009

List of elements for Manual A/C Wiring Diagram, Passenger Van (3 of 3) for Chevrolet Chevy Express G3500 2009:

• (4.3l: at left front of engine) (4.8l, 5.3l & 6.0l: at lower right front of engine) (6.6l: top front of engine) a/c compressor clutch
• (in chassis harness, 15 cm from coolant heater breakout) j119
• + gmlan data
• 12v ref
• 4.3l
• 4.8l, 5.3l & 6.0l
• 5v ref 1
• 5v ref 2
• 6.6l
• A/c cmprsr fuse 57 15a
• A/c cmprsr relay 74
• A/c refrigerant pressure sensor
• A/c request sig
• Body control module (bcm) (behind lower right side of dash)
• Clutch ctrl
• Clutch rly ctrl
• Computer data lines system
• Cooling fan assembly (6.6l) (behind radiator)
• Electronic brake control module (ebcm) (on left frame rail, near center of vehicle)
• Engine control module (ecm) (left side of engine compt)
• Engine coolant temperature (ect) sensor (4.8l, 5.3l & 6.0l: at left front of engine) (4.3l: on left side of engine) (6.6l turbo: top of engine, near thermostat housing)
• Fan cltch (d) fuse 58 10a
• Fan cltch (d) relay 75 (6.6l)
• G102 (6.6l: left front lower side of the engine block) (except 6.6l: on left rear of engine)
• G102 (left front lower side of the engine block)
• Gmlan (+)
• Gmlan (-)
• Hot at all times
• Hot w/ pwr/trn relay energized
• J102
• Low ref
• Press sens
• Sens sig
• Serial data
• Speed sig
• Tan
• Underhood fuse block (on left side of engine compt)
• W/ auxiliary fuel fired heater
• W/o auxiliary fuel fired heater

Rear A/C Wiring Diagram, Provisions for Chevrolet Chevy Express G3500 2009

List of elements for Rear A/C Wiring Diagram, Provisions for Chevrolet Chevy Express G3500 2009:

• (behind lower right side of dash) body control module (bcm)
• Body fuse block (under left front seat)
• Dimming ctrl
• G347
• Harness, 5 cm from air temperature actuator connector breakout) j250
• Hot at all times
• Hot in run
• Hvac 2 fuse 1 10a
• J356 (in body harness, 20 cm underhood fuse block breakout)
• Jx347 (in body harness, attached to lower left "b" pillar)
• Provisional
• Rear blwr fuse 37 30a
• X319
• X407
• X409