AIR CONDITIONING – GMC Sierra 2500 HD 2006 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 3) for GMC Sierra 2500 HD 2006

List of elements for Automatic A/C Wiring Diagram (1 of 3) for GMC Sierra 2500 HD 2006:

86

• (diesel)
• (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 motor (right side of dash)
• Blower motor control processor (behind right side of dash)
• Blower speed ctrl
• Blwr fuse 40a
• 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)
• 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 fuse block (lower left side of dash)
• I/p junction block (lower right side of dash)
• 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 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 3) for GMC Sierra 2500 HD 2006

List of elements for Automatic A/C Wiring Diagram (2 of 3) for GMC Sierra 2500 HD 2006:

18

• Ambient light sens lo ref
• Ambient light sens sig
• Ambient light sensor
• Ambient light/sunload sensor assembly (top center of dash)
• B12
• Body control module (lower left side of dash, below steering column)
• Class 2 serial data
• I/p junction block (lower right side of dash)
• 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 solar sensor
• Right sunload sensor sig
• Tan

Automatic A/C Wiring Diagram (3 of 3) for GMC Sierra 2500 HD 2006

List of elements for Automatic A/C Wiring Diagram (3 of 3) for GMC Sierra 2500 HD 2006:

36

• Aux htr pump fuse 10a
• Aux htr pump relay
• Auxiliary water pump
• Computer data lines system
• Cool pump fuse 15a
• Cool/ fan relay 1
• Cool/ fan relay 2
• Cool/ fan relay 3
• Cool/fan fuse 10a
• Cool/fan fuse 40a
• G100 (lower left radiator support)
• G104 (on left rear of engine block)
• G115 (on right front body mount at core support)
• Hot at all times
• Hybrid control module (hcm)
• Ign b fuse 40a
• Left cooling fan
• Pnk
• Power distribution system
• Powertrain control module (pcm)
• Pwr maint fuse 10a
• Pwr maint relay
• Red
• Right cooling fan
• S108
• S113
• S114
• S115
• Secondary underhood fuse block (left side of engine compt) (hybrid)
• Sgcm cool pmp/fan relay
• Starter/ generator control module (sgcm)
• Starter/generator control module coolant pump
• Stud #1 fuse 40a
• Tan
• Underhood cooling fan fuse block (left side of engine compt) (1500s)
• Underhood fuse block (left side of engine compt)

Compressor Wiring Diagram for GMC Sierra 2500 HD 2006

List of elements for Compressor Wiring Diagram for GMC Sierra 2500 HD 2006:

26

• (diesel)
• (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 Sierra 2500 HD 2006

List of elements for Heater Wiring Diagram for GMC Sierra 2500 HD 2006:

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)
• I/p fuse block (lower left side of dash)
• I/p junction fuse block (lower right side of dash)
• Off
• Red
• Tan
• Underhood fuse block (left side of engine compt, near battery)

Manual A/C Wiring Diagram (1 of 3) for GMC Sierra 2500 HD 2006

List of elements for Manual A/C Wiring Diagram (1 of 3) for GMC Sierra 2500 HD 2006:

67

• (diesel)
• (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 fuse block (lower left side of dash)
• I/p junction block (lower right side of dash)
• I/p relay block (left side of dash)
• Ign 3
• Ign e fuse 10a
• Inst lamp dim ctrl
• Interior lights system
• 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 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 3) for GMC Sierra 2500 HD 2006

List of elements for Manual A/C Wiring Diagram (2 of 3) for GMC Sierra 2500 HD 2006:

12

• (not used)
• B12
• Body control module (lower left side of dash, below steering column)
• Class 2 serial data
• G200 (near right "a" pillar)
• I/p junction block (lower right side of dash)
• 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)
• Tan

Manual A/C Wiring Diagram (3 of 3) for GMC Sierra 2500 HD 2006

List of elements for Manual A/C Wiring Diagram (3 of 3) for GMC Sierra 2500 HD 2006:

36

• Aux htr pump fuse 10a
• Aux htr pump relay
• Auxiliary water pump
• Computer data lines system
• Cool pump fuse 15a
• Cool/ fan relay 1
• Cool/ fan relay 2
• Cool/ fan relay 3
• Cool/fan fuse 10a
• Cool/fan fuse 40a
• G100 (lower left radiator support)
• G104 (on left rear of engine block)
• G115 (on right front body mount at core support)
• Hot at all times
• Hybrid control module (hcm)
• Ign b fuse 40a
• Left cooling fan
• Pnk
• Power distribution system
• Powertrain control module (pcm)
• Pwr maint fuse 10a
• Pwr maint relay
• Red
• Right cooling fan
• S108
• S113
• S114
• S115
• Secondary underhood fuse block (left side of engine compt) (hybrid)
• Sgcm cool pmp/fan relay
• Starter/generator control module (sgcm)
• Starter/generator control module coolant pump
• Stud #1 fuse 40a
• Tan
• Underhood cooling fan fuse block (left side of engine compt) (1500s)
• Underhood fuse block (left side of engine compt)