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AIR CONDITIONING – GMC Cab & Chassis Sierra 3500 2004 – SYSTEM WIRING DIAGRAMS

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AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 2) for GMC Cab & Chassis Sierra 3500 2004

Automatic AC Wiring Diagram (1 of 2) for GMC Cab Chassis Sierra 3500 2004

List of elements for Automatic A/C Wiring Diagram (1 of 2) for GMC Cab & Chassis Sierra 3500 2004:

87
  • (6.6l vin 1)
  • (6.6l vin 2)
  • (gasoline)
  • 5v ref
  • A/c comp cl rly ctrl
  • A/c comp fuse 10a
  • A/c compressor clutch
  • A/c compressor clutch relay
  • A/c low pressure switch (right side of accumulator)
  • A/c on
  • A/c recirc
  • A/c ref pre sens sig
  • A/c refrigerant pressure sensor (in high side pressure line)
  • A10
  • A11
  • A12
  • A5 c1
  • Amb air temp sig
  • Ambient air temperature sensor (in right front bumper filler assembly
  • Auto
  • B c5
  • B(+)
  • B10
  • B11
  • B12
  • Blower fuse 40a
  • Blower motor (right side of dash)
  • Blower motor control processor (behind right side of dash)
  • Blower speed ctrl
  • C4 e
  • C5 c1
  • Class 2 ser data
  • Class 2 serial data
  • Fan dn
  • Fan up
  • Frt def
  • G104 (on left rear of engine block)
  • G200 (near right "a" pillar)
  • G200 (near right side of dash, "a" pillar)
  • G203 (near left "a" pillar)
  • Ground
  • Hot at all times
  • Hot in run
  • Hot in run or start
  • Hvac 1 fuse 10a
  • Hvac control module (behind center of dash)
  • Hvac/ ecas fuse 10a
  • I/p relay block (left side of dash)
  • Ign 3
  • Ign e fuse 10a
  • Inside air temp sig
  • Inside air temperature sensor assembly (in headliner above driver)
  • Inst lamp dim ctrl
  • Interior lights system
  • Left i/p fuse block (lower left side of dash)
  • Left temp control
  • Lo lt air temp sig
  • Lo press sens sig
  • Lo rt air temp sig
  • Logic
  • Low ref
  • Lower left air temperature sensor (left end of hvac module)
  • Lower right air temperature sensor (bottom of hvac module)
  • Lt temp door ctrl
  • Mode
  • Mode door ctrl
  • Off
  • Powertrain control module or engine control module (left front of engine compt)
  • Recir
  • Recir door ctrl
  • Recirc door po sig
  • Red
  • Right i/p fuse block (lower right side of dash)
  • Right temp control
  • Rt temp door ctrl
  • S102 (in engine harness)
  • S218 (in i/p harn)
  • S345
  • Sp205 (in i/p harn)
  • Speed ctrl
  • Tan
  • Temp sen ass ctrl
  • Underhood fuse block (left side of engine compt, near battery)
  • Up lt air temp sig
  • Up rt air temp sig
  • Upper left air temperature sensor (below dash trim panel)
  • Upper right air temperature sensor (below dash trim panel)

Automatic A/C Wiring Diagram (2 of 2) for GMC Cab & Chassis Sierra 3500 2004

Automatic AC Wiring Diagram (2 of 2) for GMC Cab Chassis Sierra 3500 2004

List of elements for Automatic A/C Wiring Diagram (2 of 2) for GMC Cab & Chassis Sierra 3500 2004:

18
  • Ambient light sens lo ref
  • Ambient light sens sig
  • Ambient light sensor
  • B12
  • Body control module (lower left side of dash, below steering column)
  • Class 2 serial data
  • Left air temperature actuator (bottom of hvac module)
  • Left solar sensor
  • Left sunload sensor sig
  • Logic
  • Mode actuator (left side of hvac module)
  • Recirculation actuator (upper right of hvac module)
  • Right air temperature actuator (top of hvac module)
  • Right i/p fuse block (lower right side of dash)
  • Right solar sensor
  • Right sunload sensor sig
  • Sunload sensor assembly (top center of dash)
  • Tan

Compressor Wiring Diagram for GMC Cab & Chassis Sierra 3500 2004

Compressor Wiring Diagram for GMC Cab Chassis Sierra 3500 2004

List of elements for Compressor Wiring Diagram for GMC Cab & Chassis Sierra 3500 2004:

27
  • (6.6l vin 1)
  • (6.6l vin 2)
  • (gasoline)
  • 5v ref
  • A/c comp cl rly ctrl
  • A/c comp fuse 10a
  • A/c compressor clutch
  • A/c compressor clutch relay
  • A/c low pressure switch (right side of accumulator)
  • A/c on switch
  • A/c ref pre sens sig
  • A/c refrigerant pressure sensor (in high side pressure line)
  • A12
  • B11
  • Class 2 ser data
  • Class 2 serial data
  • G104 (on left rear of engine compt)
  • Hot at all times
  • Hot in run or start
  • Hvac control module (behind center of dash)
  • Ign e fuse 10a
  • Lo press sens sig
  • Logic
  • Low ref
  • Powertrain control module or engine control module (left front of engine compt)
  • Sp205 (in i/p harn)
  • Underhood fuse block (left side of engine compt, near battery)

Heater Wiring Diagram for GMC Cab & Chassis Sierra 3500 2004

Heater Wiring Diagram for GMC Cab Chassis Sierra 3500 2004

List of elements for Heater Wiring Diagram for GMC Cab & Chassis Sierra 3500 2004:

18
  • 87a
  • B c5
  • Blower fuse 40a
  • Blower motor (under right side of dash)
  • Blower motor control switch
  • Blower motor relay
  • Blower motor resistor assembly (on hvac module, near blower motor)
  • G200 (near right "a" pillar)
  • Hot at all times
  • Hot in run
  • Htr a/c fuse 30a
  • Hvac control module (behind center of dash)
  • Left i/p fuse block (lower left side of dash)
  • Off
  • Red
  • Right i/p fuse block (lower right side of dash)
  • Tan
  • Underhood fuse block (left side of engine compt, near battery)

Manual A/C Wiring Diagram (1 of 2) for GMC Cab & Chassis Sierra 3500 2004

Manual AC Wiring Diagram (1 of 2) for GMC Cab Chassis Sierra 3500 2004

List of elements for Manual A/C Wiring Diagram (1 of 2) for GMC Cab & Chassis Sierra 3500 2004:

68
  • (6.6l vin 1)
  • (6.6l vin 2)
  • (gasoline)
  • 5v ref
  • 87a
  • A/c comp cl rly ctrl
  • A/c comp fuse 10a
  • A/c compressor clutch
  • A/c compressor clutch relay
  • A/c low pressure switch (right side of accumulator)
  • A/c on switch
  • A/c recirc
  • A/c ref pre sens sig
  • A/c refrigerant pressure sensor (in high side pressure line)
  • A10
  • A11
  • A12
  • A5 c1
  • B c5
  • B(+)
  • B10
  • B11
  • B12
  • Blower fuse 40a
  • Blower motor (under right side of dash)
  • Blower motor control switch
  • Blower motor relay
  • Blower motor resistor assembly (on hvac module, near blower motor)
  • Class 2 ser data
  • Class 2 serial data
  • Frt def
  • G104 (on left rear of engine block)
  • G200 (near right "a" pillar)
  • G203 (near left "a" pillar)
  • Ground
  • Hot at all times
  • Hot in run
  • Hot in run or start
  • Htr a/c fuse 30a
  • Hvac 1 fuse 10a
  • Hvac control module (behind center of dash)
  • Hvac/ ecas fuse 10a
  • I/p relay block (left side of dash)
  • Ign 3
  • Ign e fuse 10a
  • Inst lamp dim ctrl
  • Interior lights system
  • Left i/p fuse block (lower left side of dash)
  • Left temp control
  • Lo press sens sig
  • Logic
  • Low ref
  • Lt temp door ctrl
  • Mode control
  • Mode door ctrl
  • Off
  • Off blow mt ctrl
  • Powertrain control module or engine control module (left front of engine compt)
  • Recir door ctrl
  • Recirc switch
  • Red
  • Right i/p fuse block (lower right side of dash)
  • Right temp control
  • Rt temp door ctrl
  • S102 (in engine harness)
  • Sp205 (in i/p harn)
  • Tan
  • Underhood fuse block (left side of engine compt, near battery)

Manual A/C Wiring Diagram (2 of 2) for GMC Cab & Chassis Sierra 3500 2004

Manual AC Wiring Diagram (2 of 2) for GMC Cab Chassis Sierra 3500 2004

List of elements for Manual A/C Wiring Diagram (2 of 2) for GMC Cab & Chassis Sierra 3500 2004:

12
  • (not used)
  • B12
  • Body control module (lower left side of dash, below steering column)
  • Class 2 serial data
  • G200 (near right "a" pillar)
  • Left air temperature actuator (bottom of hvac module)
  • Logic
  • Mode actuator (left side of hvac module)
  • Recirculation actuator (upper right of hvac module)
  • Right air temperature actuator (top of hvac module)
  • Right i/p fuse block (lower right side of dash)
  • Tan

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