AIR CONDITIONING – Cadillac STS 2005 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 3) for Cadillac STS 2005

List of elements for Automatic A/C Wiring Diagram (1 of 3) for Cadillac STS 2005:

• rear air temp sens low ref
• (in dash harn, 35 cm from c214)
• (in dash harn, 51 cm from left front dash speaker conn)
• 5 volt ref
• 5 volt reference
• A/c comp clutch relay
• A/c ref low temp sens sig
• A10
• A11
• A12
• After boil coolant pmp rel
• Air quality hc sens sig
• Air quality nox sens sig
• Air temp door ctrl
• Air temp door ctrl low ref
• Air temp dr position signal
• Amb air temp sensor sig
• Ambient light sensor sig
• Ambient light sensor signal
• B10
• B11
• B12
• Battery
• Blower fuse 40a
• Blower mtr speed ctrl
• Blower relay
• Ccp fuse 10a
• Comp cltch fuse 10a
• Coolant level switch signal
• Evaporator temperature sensor (inside hvac case, at evaporator core)
• G201 (behind right kick panel)
• Ground
• Hot at all times
• Hot in run
• Hot in run or start
• Hvac control module (in center of dash, below radio)
• Ignition 1 voltage
• Ignition 3 volt
• Ignition 3 voltage
• Inside air temp sensor sig
• Inside air temperature sensor (on dash, right of steering column)
• Interior lights system
• Led backlight dimming cntrl
• Left sunload sensor signal
• Low ref
• Low reference
• Low spd gm/lan serial data
• Lower mode door ctrl
• Lower mode dr pos signal
• Med blower motor ctrl
• Mode door ctrl
• Nca
• Outside amb temp low ref
• Pass air temp door ctrl
• Pass air temp dr posit sig
• Pass air temp motor ctrl
• Pass solar sensor signal
• Pnk
• Power distribution system
• Power seat system (heated seat circuit)
• R51
• R52
• R53
• R54
• R55
• R56
• R57
• R58
• Rear air temp motor cntrl
• Rear air temp sens sig
• Rear mode door control b
• Rear mode dr control a
• Rear mode pos signal
• Rear mode switch sig
• Rear temp switch sig
• Recirc door ctrl
• Recirc door pos sig
• Recirc dr cntrl
• Recirc dr pos sig
• Recirculation actuator (on hvac module, left of blower motor)
• Right sunload sensor signal
• S202
• S210
• S211 (in dash harn, 28 cm from c214)
• S222 (in hvac motor assembly harn)
• Solar sensor driver signal
• Solid state
• Sunload sensor (center of dash, in defrost grill)
• Tan
• Underhood fuse block (right front side of engine compartment)
• Wash noz/ aqs fuse 10a

Automatic A/C Wiring Diagram (2 of 3) for Cadillac STS 2005

List of elements for Automatic A/C Wiring Diagram (2 of 3) for Cadillac STS 2005:

• (3.6l)
• (4.6l)
• (front center of right
• (in dash harness, 42 cm from sp201) s231
• (in hvac motor harness)
• (inside center console, on right rear side) auxiliary mode actuator
• (not used) s3
• A/c
• A/c compressor clutch
• Air qual hc sens
• Air qual nox sens
• Air quality sensor (if equipped) (under front facia, near center of grille)
• Blower controller (in pass compt, under dash, behind glove box)
• Blower motor (under dash, behind glove box)
• Blower mtr fan control
• Blower mtr speed ctrl
• Cold
• Cylinder head) g113
• Def
• Driver air temperature actuator (on left side of hvac module)
• Dry air temp signal
• Front passenger air temperature actuator (on right side of hvac module)
• G100 (rear side of right cylinder head)
• G104 (on right front frame rail, near bumper bracket)
• G201 (behind right kick panel)
• Ground
• Hot
• Hot w/ ign 1 relay energized
• Ign 1 fuse 10a
• Ign 1 voltage
• Low ref
• Mode actuator (on top left side of hvac module)
• Mode valve signal
• Pass air temp signal
• Pnk
• Power seat system (heated seat circuit)
• Rear passenger air temperature actuator (left center of dash, on lower left side of hvac module)
• Right rear fuse block (under right side of rear seat)
• S212 (in dash harness, 38 cm from ipm c3)
• S223
• Splice pack
• Tan

Automatic A/C Wiring Diagram (3 of 3) for Cadillac STS 2005

List of elements for Automatic A/C Wiring Diagram (3 of 3) for Cadillac STS 2005:

• (near left front strut tower) g101
• (on right front frame rail, near bumper bracket) g104
• 3.6l
• 4.6l
• 5v reference
• A/c clutch relay ctrl
• A/c refrig press sensor
• A/c refrigerant pressure sensor (near the left front strut tower)
• After boil fuse 10a
• After boil heater pump (4.6l)
• After boil relay (4.6l)
• Ambient air temperature sensor (under front facia, near center of grille)
• Computer data lines system
• Coolant level switch (in bottom of coolant reservoir)
• Ect sensor signal
• Engine control module (ecm) (front of engine, on right valve cover)
• Engine control module (ecm) (on left front frame rail, below left headlight assembly)
• Engine controls system
• Engine coolant hot
• Engine coolant low level
• Engine coolant temperature (ect) sensor (3.6l: center of left cylinder head) (4.6l: rear side of right cylinder head)
• Feed
• G100 (on rear side of right cylinder head)
• Hi speed fan relay
• Hi speed fan relay ctrl
• High fan fuse 30a
• Hot at all times
• Instrument panel cluster
• Left cooling fan (behind radiator)
• Lo speed fan relay
• Logic
• Low fan fuse 30a
• Low reference
• Low speed fan relay ctrl
• Main relay
• Main relay ctrl
• Message center
• Pnk
• R14
• R15
• R16
• R17
• R18
• R19
• R20
• R21
• R22
• R26
• R27
• R29
• R30
• R39
• R40
• R41
• R42
• R47
• R48
• R49
• R50
• Radio
• Right cooling fan (behind radiator)
• Right rear fuse block (under right side of rear seat)
• Rtn
• S/p fan relay
• S107 (3.6l) (in engine harn, 36 cm from brake pressure sensor connector)
• S108 (3.6l) (in engine harness, 28 cm from maf sensor connector)
• S120 (3.6l) (in engine poa harness 21 cm from throttle body assembly connector)
• Serial data
• Sig
• Splice pack sp201 (in dash harn, under dashboard, near firewall grommet)
• Tan
• Underhood fuse block (right front side of engine compartment)

Compressor Wiring Diagram for Cadillac STS 2005

List of elements for Compressor Wiring Diagram for Cadillac STS 2005:

• (3.6l)
• (4.6l)
• (front center of right
• (not used) s3
• 3.6l
• 4.6l
• 5v reference
• A/c clutch relay ctrl
• A/c comp clutch relay
• A/c compressor clutch
• A/c refrig press sensor
• A/c refrigerant pressure sensor (near the left front strut tower)
• Comp cltch fuse 10a
• Computer data lines system
• Cylinder head) g113
• Engine control module (ecm) (front of engine, on right valve cover)
• Engine control module (ecm) (on left front frame rail, below left headlight assembly)
• Engine controls system
• Feed
• G100 (rear side of right cylinder head)
• Hot at all times
• Hot w/ ign 1 relay energized
• Ign 1 fuse 10a
• Low reference
• Pnk
• R55
• R56
• R57
• R58
• Right rear fuse block (under right side of rear seat)
• Rtn
• S107 (3.6l) (in engine harn, 36 cm from brake pressure sensor connector)
• S108 (3.6l) (in engine harness, 28 cm from maf sensor connector)
• Serial data
• Sig
• Splice pack
• Tan
• Underhood fuse block (right front side of engine compartment)