AIR CONDITIONING – Cadillac CTS 2003 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 3) for Cadillac CTS 2003

List of elements for Automatic A/C Wiring Diagram (1 of 3) for Cadillac CTS 2003:

• 5 volt reference
• After boil pump relay ctrl
• Air inlet motor
• Amb air temp sensor sig
• Ambient light sensor signal
• Battery
• Blower fuse 40a
• Blower mtor speed ctrl
• Blower relay
• Blower relay ctrl
• Ccp fuse 10a
• Comp clutch fuse 10a
• Comp clutch relay
• Coolant level switch signal
• Door a
• Door b
• Dr air temp door ctrl b
• Driver air temp door ctrl a
• Driver air temp posit signal
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Evap low temp sens signal
• Evaporator temperature sensor
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• G201 (in passenger compartment, behind right kick pad)
• Ground
• Hot at all times
• Hot in run
• Hvac control module (behind center of dash, below radio)
• Ign 3 fuse 10a
• Ignition 3 voltage
• Inside air temp sensor sig
• Inside air temperature sensor
• Left rear fuse block (below left rear seat)
• Left sunload sensor signal
• Low reference
• Mode door ctrl a
• Mode door ctrl b
• Mode door position signal
• Nca
• Pass air temp door ctrl a
• Pass air temp door ctrl b
• Pass air temp posit signal
• Pnk
• R51
• R52
• R53
• R54
• R55
• R56
• R57
• R58
• Recirc door ctrl a
• Recirc door ctrl b
• Recirculation actuator (on hvac module module, left of blower motor)
• Red
• Right sunload sensor signal
• S117
• Serial data
• Solid state
• Splice pack sp302 (in passenger compartment, on left frame rail, near left side of driver's seat)
• Sunload sensor (at front center of passenger compartment, on defroster grill)
• Underhood fuse block (at left front of engine compartment)
• Volt

Automatic A/C Wiring Diagram (2 of 3) for Cadillac CTS 2003

List of elements for Automatic A/C Wiring Diagram (2 of 3) for Cadillac CTS 2003:

• (in engine harness, approximately 235 cm (98.3 in) from knock sensor 1 connector)
• (in passenger compartment, behind right kick pad) g201
• 2 (or 4)
• 4 (or 2)
• A/c
• A/c compressor clutch (on front of a/c compressor)
• Accessory
• After boil coolant pump (in engine compartment, on right side of engine block)
• After boil fuse 10a
• After boil relay
• Blower motor (in passenger compartment, on right side of hvac module)
• Blower motor control processor (in passenger compartment, on lower left side of blower motor)
• Blower mtr speed ctrl
• Cold
• Crank
• Def
• Driver's air temperature actuator (in passenger compartment, on hvac module)
• Dry air temp signal
• G100 (in engine compartment, on engine block near starter motor)
• Hot
• Hot at all times
• Ignition switch
• Mix motor
• Mode actuator
• Mode actuator (in passenger compartment, on hvac module)
• Mode valve signal
• Nca
• Off/lock
• Pass air temp signal
• Passenger's air temperature actuator (in passenger compartment, on hvac module)
• Pnk
• R11
• R12
• R13
• R15
• Red
• Right rear fuse block (below right rear seat)
• Run
• S118
• S323
• Splice pack sp201 (in passenger compartment, behind ignition switch, near hvac module)
• Splice pack sp203 (in passenger compartment, under left side of dash trim pad)

Automatic A/C Wiring Diagram (3 of 3) for Cadillac CTS 2003

List of elements for Automatic A/C Wiring Diagram (3 of 3) for Cadillac CTS 2003:

• (in engine compartment, near left front strut tower at bottom of inside fender well) g101
• (in engine compartment, on engine block near starter motor) g100
• (on right front corner of vehicle, on right body rail near right headlamp) g104
• 5v reference
• 87a
• A/c clutch relay ctrl
• A/c refrig press sensor
• A/c refrigerant pressure sensor (in engine compartment, near left front stut tower)
• Coolant bypass solenoid (at upper right corner of radiator)
• Coolant level switch (in left front corner of coolant surge tank)
• Ect sensor signal
• Engine control module (ecm) (at right front corner of engine compartment)
• Engine coolant low level
• Engine coolant temperature sensor (on top rear of intake manifold)
• Feed
• Hi speed fan relay
• High (or hi) fuse 30a
• High speed fan relay ctrl
• Hot at all times
• Hot in on or start
• Htr/vlv/cltch fuse 10a
• Left cooling fan (at front of engine compartment, in left side of fan assembly)
• Lo speed fan relay
• Low
• Low fan fuse 30a
• Low reference
• Low speed fan relay ctrl
• Main relay
• Main relay ctrl
• Outside ambient air temperature sensor (under front bumper, near front grille)
• Pnk
• R39
• R40
• R41
• R42
• R47
• R48
• R49
• R50
• Radio
• Right cooling fan (at front of engine compartment, in right side of fan assembly)
• Rtn
• S/p fan relay
• S111 (in engine harness, approximately 120 cm (31.5 in) from ho2s bank 2 sensor 1)
• Serial data
• Sig
• Signal
• Splice pack sp102 (in right front corner of engine compartment, in front of underhood fuse block
• Tan
• Underhood fuse block (at left front of engine compartment)

Compressor Wiring Diagram for Cadillac CTS 2003

List of elements for Compressor Wiring Diagram for Cadillac CTS 2003:

• (in engine compartment, on engine block near starter motor) g100
• 5v reference
• A/c clutch relay ctrl
• A/c compressor clutch (on front of a/c compressor)
• A/c refrig press sens sig
• A/c refrigerant pressure sensor (in engine compartment, near left front strut tower)
• Accessory
• Comp clutch fuse 10a
• Comp clutch relay
• Crank
• Engine control module (ecm) (at right front corner of engine compartment)
• Feed
• Hot at all times
• Hvac control module
• Ignition switch
• Low reference
• Nca
• Off/lock
• Pnk
• R55
• R56
• R57
• R58
• Return
• Run
• Serial data
• Sig
• Splice pack sp102 (in right front corner of engine compartment, in front of underhood fuse block)
• Splice pack sp201 (in passenger compartment, behind ignition switch, near hvac module)
• Tan
• Underhood fuse block (at left front of engine compartment)