AIR CONDITIONING – Cadillac STS 2009 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 3) for Cadillac STS 2009

List of elements for Automatic A/C Wiring Diagram (1 of 3) for Cadillac STS 2009:

• (on dash right of steering column) inside air temperature (iat) sensor
• 5v ref
• A/c refrigerant low temp sens sig
• Air quality hc sens sig
• Air quality nox sens sig
• Air temp dr ctrl
• Ambient air temp sens sig
• Ambient light sens sig
• Auxiliary air temp dr ctrl
• Auxiliary air temp dr position sig
• Auxiliary air temperature actuator (left center of dash, on lower left side of hvac module)
• Auxiliary mode actuator (inside center console, on right rear side)
• Auxiliary mode dr position sig
• Batt positive volt
• Blower mtr spd ctrl
• Blwr fuse 40a
• Ccp fuse 10a
• Ccp/ rly coils fuse 10a
• Computer data lines system
• Drv air temp dr position sig
• Drv sunload sens sig
• Frt blwr relay
• G201 (in passenger compt, behind right kick panel)
• Gnd
• Hot at all times
• Hot w/ run crnk relay energized
• Hvac control module (center of dash, below radio)
• Ign 3 vlot
• Inside air temp sens assembly ctrl
• Inside air temp sens sig
• Interior lights system
• J210
• J211 (in dash harness, 28 cm from x214)
• Led backlight dimming ctrl
• Low ref
• Low spd gmlan serial data
• Medium 2 blower mtr ctrl
• Medium 3 blower mtr ctrl
• Medium blower mtr ctrl
• Mode dr ctrl
• Nca
• Pass air temp dr position sig
• Pass sunload sens sig
• Pnk
• Rear mode dr ctrl a
• Rear mode mtr low ref
• Recirculation actuator (on hvac module, left of blower motor)
• Recirculation door ctrl
• Recirculation door position sig
• Right air temp dr ctrl a
• Run/crank ign 1 volt
• Tan
• Tan/red
• Underhood fuse block (right front side of engine compt)

Automatic A/C Wiring Diagram (2 of 3) for Cadillac STS 2009

List of elements for Automatic A/C Wiring Diagram (2 of 3) for Cadillac STS 2009:

• (center of dash, in defroster grille) sunload sensor
• (in hvac motor assembly harness) j222
• (in hvac motor assembly harness) j223
• (under front fascia, near center of grille) ambient air temperature sensor
• (under front fascia, near front grille center) (if equipped) air quality sensor
• Air filter recirculating)
• Auxiliary hvac control module (w/ rear heated seat)
• Blower motor (under dash, behind glove box)
• Blower motor control module (behind right side of instrument panel)
• Blower mtr fan ctrl
• Blower mtr resistor assembly sply volt
• Blower mtr spd ctrl
• Blower mtr sply volt
• Evaporator temperature sensor (inside hvac case, at evaporator core)
• G104 (on right front frame rail, near bumper bracket)
• G201 (in passenger compt, behind right kick panel)
• Gnd
• Hot w/ run crnk relay energized
• Htd wash/ aqs fuse 10a
• J202 (in instrument panel harness, 50.5 cm from left front speaker)
• J212
• Left air temperature actuator (left center of dash, on left side of hvac module)
• Pnk
• Right air temperature actuator (right center of dash, on right side of hvac module)
• Run/crank ign 1 volt
• Tan/ red
• Tan/red
• Underhood fuse block (right front side of engine compt)

Automatic A/C Wiring Diagram (3 of 3) for Cadillac STS 2009

List of elements for Automatic A/C Wiring Diagram (3 of 3) for Cadillac STS 2009:

• (on right front frame rail, near bumper bracket) g104
• (or 2751)
• (or 476)
• 3.6l
• 3.6l & 4.6l w/o trailer provisions
• 4.4l & 4.6l
• 4.4l & 4.6l w/ trailer provisions
• 4.4l 3.6l
• 4.6l
• 5v reference 3
• 87a
• A/c clutch fuse 10a
• A/c cmprsr
• A/c compressor clutch
• A/c compressor clutch relay
• A/c refrig press sens
• A/c refrigerant pressure sensor (near left front strut tower, on a/c refrigerant line)
• Clutch relay ctrl x2
• Computer data lines system
• Ect sensor signal
• Engine control module (ecm) (3.6l: front of engine, on right valve cover) (except 3.6l: on left front frame rail, below left headlamp assembly)
• Engine coolant temperature (ect) sensor (3.6l: in center of left cylinder head) (4.4l: rear of right cylinder head) (4.6l: in rear side of right cylinder head)
• Engine cooling fan
• Engine cooling fan resistor
• Fan 1 fuse 30a
• Fan 2 fuse 30a
• G100 (on rear side of right cylinder head)
• G104 (on right front frame rail, near bumper bracket)
• Hi fan spd relay
• Hi spd fan rly ctrl
• Hot at all times
• Hot w/ pwr/ trn relay energized
• Left engine cooling fan (behind radiator)
• Lo fan spd relay
• Low ref
• Low reference
• Low spd fan rly ctrl
• Mode actuator (on top left side of hvac module)
• Post 02 snsr fuse 15a
• Right engine cooling fan (behind radiator)
• S/p fan relay
• Serial data bus +
• Serial data bus -
• Tan
• Underhood fuse block (right front side of engine compt)

Compressor Wiring Diagram for Cadillac STS 2009

List of elements for Compressor Wiring Diagram for Cadillac STS 2009:

• (or 2751)
• 3.6l
• 5v ref 3
• A/c cltch fuse 10a
• A/c cmprsr cltch relay
• A/c compressor clutch
• A/c refrigerant pressure sensor (near left front strut tower, on a/c refrigerant line)
• Computer data lines system
• Data bus+
• Data bus-
• Engine control module (ecm) (3.6l: front of engine, on right valve cover) (except 3.6l: on left front frame rail, below left headlamp assembly)
• Except 3.6l
• G100 (on rear side of right cylinder head)
• Hot at all times
• Hot w/ pwr/trn relay energized
• Low ref
• Post 02 snsr fuse 15a
• Rly ctrl
• Sens sig
• Tan
• Underhood fuse block (right front side of engine compt)