All Wiring Diagrams for Buick LaCrosse CX 2005 model – Arabalar için bağlantı şemaları

AIR CONDITIONING

3.6L VIN 7

3.6L VIN 7, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005

List of elements for 3.6L VIN 7, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005:

(engine harness, 20cm from g115) (w/ sulev) s114
(in back of right headlamp on frame) g100
(lower right front of engine, (on transaxle stud, to right of starter) g115
(on front of a/c compressor) a/c compressor clutch
A/c clu diode
A/c clutch fuse 13 10a
A/c comp relay
A/c compressor clutch solenoid
A/c compressor temperature switch
A/c request ind
A/c request switch
A10
A11
A12
A18
A19
Air temp a
Air temp b
Auto
B10
B11
B12
Battery
Blower motor sw
C18
C19
Class 2 serial
Computer data lines system interior lights system
Defogger
Display
Driver temperature down control
Driver temperature up control
E10
Fan 1 fuse 29 30a
Fan 1 relay
Fan 2 fuse 32 30a
Fan 2 relay
Fan 3 relay
G202 (left side of dash, at base of steering column)
Ground
High
Hot at all times
Hot in run or start
Hvac control module (center of dash)
Ign
Illum
Ind
K14
K15
K18
K19
L14
Left air temperature actuator (left side of hvac module)
Logic
Low
Low ref
Lower left air temperature sensor
Lower right air temperature sensor
M14
M15
M18
M19
Mode actuator (on lower right side of dash)
Mode door
Mode switch
Nca
Off
Pass
Passenger temp down control
Passenger temp up control
Pnk
Rear defogger switch
Recirculation
Recirculation a
Recirculation actuator (in right footwell)
Recirculation b
Recirculation switch
Right air temperature actuator (right side of hvac module)
S211 (dash harness, at center of dash)
Sensor sig
Speed ctrl
Tan
Underhood fuse block (mounted to right strut tower)

3.6L VIN 7, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005:

(dash harness, at center of dash) s211
(in off-engine wiring harn, 32 cm from underhood fuse block)
5v reference
A/c comp clutch
A/c press signal
A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
Batt main 4 fuse 30 30a
Battery
Blower motor (behind right side of dash, in hvac module)
Blower motor control processor (on lower right side of dash)
Class 2 serial
Computer data lines system
D11
Display fuse 18 10a
Ect sens sig
Engine control module (ecm) (top of engine)
Engine controls system
Engine coolant temperature (ect) sensor (top right of intake manifold)
G200 (center of dash cross beam, behind radio)
G202 (left side of dash, at base of steering column)
Gnd
Hot at all times
Hot in run or start
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Ign
Inside air temperature sensor (left side of dash)
Left cooling fan motor (on left side of radiator)
Low ref
Pnk
Red
Relay ctrl
Right cooling fan motor (on right b
S118
S119 (engine harn, 13.5 cm from ecm breakout)
S213 (dash harness, at center of dash)
Speed ctrl
Sunload sensor assembly (top center of dash)
Tan
Underhood fuse block (mounted to right strut tower)
Upper left air temperature sensor (center of dash, in left ventilation duct)
Upper right air temperature sensor (center of dash, in right ventilation duct)

3.6L VIN 7, Compressor Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Compressor Wiring Diagram for Buick LaCrosse CX 2005:

(engine harness, 20cm from g115) (w/ sulev) s114
(in off-engine wiring harn, 32 cm from underhood fuse block)
(lower right front of engine, (on transaxle stud, to right of starter) g115
(on front of a/c compressor) a/c compressor clutch
5v reference
A/c clu diode
A/c clutch fuse 13 10a
A/c comp clutch
A/c comp relay
A/c compressor clutch solenoid
A/c compressor temperature switch
A/c press signal
A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
A/c request ind
A/c request switch
Battery
Class 2 serial
Computer data lines
Computer data lines system
Display fuse 18 10a
Engine control module (ecm) (top of engine)
Engine controls system
G202 (left side of dash, at base of steering column)
Ground
Hot at all times
Hot in run or start
Hvac control module (center of dash)
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Ign
Logic
Low ref
Nca
Pnk
S118
S211 (dash harness, at center of dash)
Underhood fuse block (mounted to right strut tower)

3.8L VIN 2

3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005:

(engine harness, 20cm from g115) (w/ sulev) s114
(in back of right headlamp on frame) g100
(lower right front of engine, (on transaxle stud, to right of starter) g115
(on front of a/c compressor) a/c compressor clutch
A/c clu diode
A/c clutch fuse 13 10a
A/c comp relay
A/c request ind
A/c request switch
A10
A11
A12
A18
A19
Air temp a
Air temp b
Auto
B10
B11
B12
Battery
Blower motor sw
C18
C19
Class 2 serial
Computer data lines system interior lights system
Defogger
Display
Driver temperature down control
Driver temperature up control
E10
Fan 1 fuse 29 30a
Fan 1 relay
Fan 2 fuse 32 30a
Fan 2 relay
Fan 3 relay
G202 (left side of dash, at base of steering column)
Ground
High
Hot at all times
Hot in run or start
Hvac control module (center of dash)
Ign
Illum
Ind
K14
K15
K18
K19
L14
Left air temperature actuator (left side of hvac module)
Logic
Low
Low ref
Lower left air temperature sensor
Lower right air temperature sensor
M14
M15
M18
M19
Mode actuator (on lower right side of dash)
Mode door
Mode switch
Off
Pass
Passenger temp down control
Passenger temp up control
Pnk
Rear defogger switch
Recirculation
Recirculation a
Recirculation actuator (in right footwell)
Recirculation b
Recirculation switch
Right air temperature actuator (right side of hvac module)
S211 (dash harness, at center of dash)
Sensor sig
Speed ctrl
Tan
Underhood fuse block (mounted to right strut tower)

3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005:

(dash harness, at center of dash) s211
5v reference
A/c comp clutch
A/c press signal
A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
Batt main 4 fuse 30 30a
Battery
Blower motor (behind right side of dash, in hvac module)
Blower motor control processor (on lower right side of dash)
Class 2 serial
Computer data lines system
D11
Display fuse 18 10a
Ect sens sig
Engine coolant temperature (ect) sensor (on top right of intake manifold)
G200 (center of dash cross beam, behind radio)
G202 (left side of dash, at base of steering column)
Gnd
Hot at all times
Hot in run or start
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Ign
Inside air temperature sensor (left side of dash)
Left cooling fan motor (on left side of radiator)
Low ref
Pnk
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Red
Relay ctrl
Right cooling fan motor (on right b
S213 (dash harness, at center of dash)
Speed ctrl
Sunload sensor assembly (top center of dash)
Tan
Underhood fuse block (mounted to right strut tower)
Upper left air temperature sensor (center of dash, in left ventilation duct)
Upper right air temperature sensor (center of dash, in right ventilation duct)

3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CX 2005:

(dash harness, at center of dash) s211
(engine harness, 20cm from g115)
(on front of a/c compressor) a/c compressor clutch
(w/ sulev) s114
5v reference
A/c clu diode
A/c clutch fuse 13 10a
A/c comp clutch
A/c comp relay
A/c press signal
A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
A/c request ind
A/c request switch
Automatic a/c
Battery
Class 2 serial
Computer data lines system
Display fuse 18 10a
G115 (on transaxle stud, to right of starter)
G202 (left side of dash, at base of steering column)
Ground
Hot at all times
Hot in run or start
Hvac control module (center of dash)
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Ignition 1
Logic
Low ref
Manual a/c
Pnk
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Underhood fuse block (mounted to right strut tower)

3.8L VIN 2, Manual A/C Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Manual A/C Wiring Diagram for Buick LaCrosse CX 2005:

(dash harness, at center of dash) s211
(engine harness, 20cm from g115)
(on front of a/c compressor) a/c compressor clutch
(w/ sulev) s114
5v reference
A/c clu diode
A/c clutch fuse 13 10a
A/c comp clutch
A/c comp relay
A/c press signal
A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
A/c request ind
A/c request switch
A10
A11
A12
A18
A19
Air temp a
Air temp b
Air temperature actuator (right side of hvac module)
B10
B11
B12
Batt main 4 fuse 30a
Battery
Blower motor (behind right side of dash, in hvac module)
Blower motor control processor (on lower right side of dash)
Blower motor sw
C18
C19
Class 2 serial
Computer data lines system
Defogger
Display fuse 18 10a
E10
Ect sens sig
Engine coolant temperature (ect) sensor (on top right of intake manifold)
Fan 1 fuse 29 30a
Fan 1 relay
Fan 2 fuse 32 30a
Fan 2 relay
Fan 3 relay
G100 (in back of right headlamp on frame)
G115 (on transaxle stud, to right of starter)
G200 (center of dash cross beam, behind radio)
G202 (left side of dash, at base of steering column)
Gnd
Ground
High
High spd cooling
Hot at all times
Hot in run or start
Hvac control module (center of dash)
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Ignition 1
Illum
Ind
Interior lights system
K14
K15
K18
K19
L14
Left cooling fan motor (on left side of radiator)
Logic
Low
Low ref
Low spd cooling
M14
M15
M18
M19
Mode actuator (on lower right side of dash)
Mode door
Mode switch
Off
Pnk
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Rear defogger switch
Recirculation
Recirculation a
Recirculation actuator (in right footwell)
Recirculation b
Recirculation switch
Red
Right cooling fan motor (on right side of radiator)
S213 (dash harness, at center of dash)
Speed ctrl
Tan
Temperature control sw
Underhood fuse block (mounted to right strut tower)

ANTI-LOCK BRAKES

Anti-lock Brakes Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005

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List of elements for Anti-lock Brakes Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005:

(left side of engine compt, part of brake pressure modulator valve) electronic brake control module (ebcm)
3.6l
3.6l w/ active brake control
3.6l w/o active brake control
3.8l
3.8l w/o active brake control
5-volt reference
A11
A2 c2
A9 c5
Abs fuse 23 10a
Abs mtr fuse 31 40a
Abs sol fuse 19 25a
Abs/tcs class 2 serial data
B+ motor control
B+ sol valve control
Battery
Brake pressure modulator valve (bpmv)
Brake pressure sensor signal
C1 c5
C2 c4
Computer data lines system
Del torque sig
Delivered torque signal
Ecm class 2 ser data
Eng speed sig
Eng speed sig (3.6l)
Eng speed sig (3.8l)
Engine control module (top of engine) (3.6l)
Engine controls system
G115 (3.6l: mounted to bank no. 1 cylinder head above exhaust manifold) (3.8l: on transmission stud, to right of starter)
Ground
Hi spd gmlan ser data +
Hi spd gmlan ser data -(3.6l)
Hot at all times
Hot in run or start
Hsv 2 (w/ tcs)
Hsv1 (w/ tcs)
Ign 1
Lateral accelerometer signal
Left front inlet
Left front outlet
Left rear inlet
Left rear outlet
Lf wheel speed sens low ref
Lf wheel speed sens sig
Lr wheel speed sens low ref
Lr wheel speed sens sig
Magnasteer actuator (left rear of engine compt)
Pcm class 2 ser data
Pnk
Powertrain control module (3.8l)
Pump motor
Red
Req torque sig
Requested torque signal
Rf wheel speed sens low ref
Rf wheel speed sens sig
Right front inlet
Right front outlet
Right rear inlet
Right rear outlet
Rr wheel speed sens low ref
Rr wheel speed sens sig
Solenoid valves
Stop lamp sw sig
Tan
Underhood fuse block (mounted to right strut tower)
Usv 1 (w/ tcs)
Usv 2 (w/ tcs)
Var effort steer act cntrl
Var effort steer act pwr
Yaw rate sensor signal
Yaw rate sensor test control

Anti-lock Brakes Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005

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List of elements for Anti-lock Brakes Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005:

(on left front bearing & hub assembly) left front wheel speed sensor (wss)
(on left rear bearing & hub assembly)
(on right front bearing & hub assembly) right front wheel speed sensor (wss)
(on right rear bearing & hub assembly) right rear wheel speed sensor (wss)
10v ref
5v ref
Abs ind
Abs/tcs class 2 ser data
Bcm class 2 ser data
Body control module (bcm) (behind left side of dash)
Brake fluid pressure sensor (left rear of engine compt)
Brake pedal position sensor (under left side of dash)
Computer data lines system
Driver information center (dic)
G202 (left side of dash)
Ground
Hi spd gmlan ser data +
Hi spd gmlan ser data -
Ign 1 volt
Instrument panel cluster (ipc)
Ipc class 2 ser data
Lateral accelerometer sig
Left rear wheel speed sensor (wss)
Lo traction
Logic
Low ref
Message center
Nca
Pnk
Red
S107 (in off-engine wiring harn, approx 6 cm (2.3 in) from breakout to brake fluid pressure sensor, towards brake fluid pressure sensor)
S211
S216 (in i/p wiring harn, inside passenger compt approx 14 cm (5.5 in) from pass-through to brake fluid level switch)
Steering angle sensor (in steering column)
Stop lamp sw sig
Stop lmp sw sig
Tan
Tcs fail
Traction control (uplevel)
Traction control off ind
Traction control switch sig
Yaw rate & lateral acceleration sensor (under the rear side of center console)
Yaw rate sen sig
Yaw rate test cntrl

ANTI-THEFT

Forced Entry Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Forced Entry Wiring Diagram for Buick LaCrosse CX 2005:

(body wiring harn, below right side of front passenger seat)
(body wiring harness, below right front passenger seat) s315
(if equipped) rear window antenna grid
(inside left door sill, forward of left front seat) g301
(right side of package shelf) remote control door lock receiver (rcdlr)
A5 c2
Ajar
Ajar sw sig
Antenna sig
Bcm class 2
Body control module (behind left side of dash, left of steering column)
Class 2
Coax
Computer data lines system
Door ajar indicator
Door lock actuator
Door lock ajar indicator switch
Door lock cylinder switch
Door lock open indicator switch
Dr ajar sw sig
Dr lk/ trunk fuse 15a
Dr open sw sig
Driver door lock
Driver door lock switch
Enable sig
Front passenger door lock
Front passenger door lock switch
G202 (at base
G301 (inside left door sill, forward of left front seat)
G302 (right door sill, forward of right front seat)
Ground
Headlights system exterior lights system
Hi beam relay
Horn rly ctrl
Horns system
Hot at all times
I/p fuse block (behind right side of dash)
Instrument panel cluster (ipc)
Interior lights system
Lamp rly ctrl
Left rear door lock
Lid ajar sw
Lock
Lock ctrl
Lock sig
Logic
Nca
Of steering column)
Open
Rear compartment lid latch (in rear compartment lid)
Rfa/mod fuse 10a
Right rear door lock
S211
S303
S314
S406
S500
S501
S604
S605
Scrty ind ctrl
Security indicator
Tan
Theft led (top of dash)
Trunk ajar indicator
Unlock
Unlock ctrl
Unlock sig
Volt (+)

Pass-Key Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Pass-Key Wiring Diagram for Buick LaCrosse CX 2005:

(top of engine) engine control module (ecm)
3.6l
3.8l
Body control module (bcm) (behind left side of dash, left of steering column)
Class 2 data
Class 2 serial data
Computer data lines system
Dr lk/ trunk fuse 15a
G202 (left side of dash, at base of steering column)
Hot at all times
I/p fuse block (behind right side of dash)
Ignition key
Instrument panel cluster (ipc)
Logic
Message center
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Reader/ exciter
Reference
S214
Security indicator
Service theft system
Starting disabled due to theft system
Tan
Theft deterrent exciter module (part of ignition key cylinder)
Theft system not programmed
Transponder
Voltage

BODY CONTROL MODULES

Body Control Modules Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Body Control Modules Wiring Diagram for Buick LaCrosse CX 2005:

(3.6l: on trans stud, 3.8l: lower left side of engine)
(behind left side of dash, left of steering column) body control module (bcm)
(center of dash cross beam, behind radio) g200
(not used)
10 volt ref
12 volt ref
A/t shft lk ctrl sol volt
A/t shift lock ctrl
Actuator lock ctrl
Actuator unlock ctrl
Anti-lock brakes system
Anti-theft system
Battery
Battery positive volt
Body control module (bcm) (behind left side of dash, left of steering column)
C1 e5
C2 a5
C2 d9
Chime ctrl
Chmsl/ bkup fuse 15a
Class 2 serial data
Computer data lines system
Courtesy lamp volt
Courtesy lamps sw on sig
Crank volt
Defogger system
Dimmer sw high beam sig
Door lock key sw lock sig
Door locks system
Dr lck/ trunk fuse 15a
Drl ambient sens sig
Drv door lock sw lock sig
Drv door lock unlock ctrl
Drv heated seat low ref
Drv heated seat rly ctrl
Drvr dr lock sw unlock sig
Exterior lamps off input
Exterior lights system
Flash to pass sw sig
Fog lamp rly ctrl
Front fog lamp sw sig
Frt wiper sw high sig
G111
G201 (below dash, bolted to dash carrier)
G301 (inside left door sill, forward of left front seat)
Ground
Hazard sw sig
Hazrd fuse 20a
Hdlmp mod voltage sply
Headlamp sw on sig
Headlights system
Heated seat sens sig
Highbeam rly ctrl
Hood ajar sw sig
Horn rly ctrl
Horns system
Hot at all times
I/p dimming ctrl
I/p dimming ret
I/p dimming return
I/p dimming volt ref
I/p fuse block (behind right side of dash)
Ignition 1 volt
Ignition 3 volt
Inflatable restraint steering wheel module coil
Int/ illum fuse 10a
Interior lights system
Key in ignition sw sig
Key switch unlock sig
Keyless entry sig
Left turn sig sw sig
Lf door ajar sw sig
Lf door open sw sig
Lf turn sig lmp volt
Low ref
Low washer fluid ind sig
Lr door ajar sw sig
Lr door open sw sig
Lr stop/turn lmp sply volt
Navigation system
Nca
Park brake sw sig
Park brake switch (park brake assembly)
Park lamp rly ctrl
Park lamp sw on sig
Pass door lock sw lock sig
Pass dr lock sw unlock sig
Pass heated seat low ref
Pass heated seat rly ctrl
Pass heated seat sens sig
Pnk
Power courtesy lamp
Power distribution system
Rap rly ctrl
Rear compt lid ajar sw
Rear compt lid rel sw
Rear defog rly ctrl
Red
Remote start sens sig
Rf door ajar sw sig
Rf door open sw sig
Rf turn sig lmp volt
Right turn sig sw sig
Rr door ajar sw sig
Rr door open sw sig
Rr stop/turn lmp sply volt
S303
Seats system
Security indicator ctrl
Sens low ref
Shift interlock system
Starting/charging system
Stop lamp sw sig
Stop lamp sw sog
Tan
Telephone voice sig
Traction ctrl sw sig
Trunk release ctrl
Trunk, tailgate, fuel doors system
Underhood fuse block (mounted to right strut tower)
Warning system
Washer/ rvc fuse 6 15a
Windshield pump ctrl
Windshield washer sw sig
Wiper motor park sw sig
Wiper rly ctrl
Wiper/washer system
Wndshld wash sw high sig
Wndshld wash sw low sig

COMPUTER DATA LINES

Computer Data Lines Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Computer Data Lines Wiring Diagram for Buick LaCrosse CX 2005:

(3.6l)
(left side of dash, at base of steering column) g202
3.6l
3.8l
A11
Abs/tcs class 2 serial data
Adg class 2 serial data
B10
Bcm class 2 serial data
Body control module (bcm) (behind left side of dash, left of steering column)
Class 2 serial data
Data link connector (dlc) (under left side of dash)
Digital radio receiver (left side of trunk)
Ecm class 2 serial data
Electronic brake control module (left side of engine compt, part of brake pressure modulator valve)
Engine control module (ecm) (top of engine)
G200 (center of dash cross beam, behind radio)
Hot at all times
Hvac class 2 serial data
Hvac control module (center of dash)
I/p fuse block (behind right side of dash)
Inflatable restraint sensing & diagnostic module (sdm) (under right front seat)
Instrument panel cluster (ipc)
Ipc class 2 serial data
Manual a/c automatic a/c
Onstar/ aldl fuse 10a
Pcm class 2 serial data
Power distribution system
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Radio
Radio class 2 serial data
S211
S213
Sae j1939 serial data bus +
Sae j1939 serial data bus -
Sdm class 2 serial data
Splice pack sp205 (right side of dash)
Tan
Throttle actuator control (tac) module (on throttle body)
Transmission control module (tcm) (3.6l)
Uart serial data primary
Uart serial data secondary
Vehicle communication interface module (vcim) (behind center of dash)

COOLING FAN

3.6L VIN 7

3.6L VIN 7, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2005:

(in back of right headlamp on frame) g100
A18
A19
C18
C19
Class 2 serial
Computer data lines system
E10
Ect sens sig
Engine control module (ecm) (top of engine)
Engine coolant temperature (ect) sensor (top right of intake manifold)
Fan 1 fuse 29 30a
Fan 1 relay
Fan 2 fuse 32 30a
Fan 2 relay
Fan 3 relay
Hot at all times
K14
K15
K18
K19
L14
Left cooling fan motor (on left side of radiator)
Low ref
M14
M15
M18
M19
Relay ctrl
Right cooling fan motor (on right side of radiator)
S119 (engine harn, 13.5 cm from ecm breakout)
Tan
Underhood fuse block (mounted to right strut tower)

3.8L VIN 2

3.8L VIN 2, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2005:

(in back of right headlamp on frame) g100
A18
A19
C18
C19
Class 2 serial
Computer data lines system
E10
Ect sens sig
Engine coolant temperature (ect) sensor (top right of intake manifold)
Fan 1 fuse 29 30a
Fan 1 relay
Fan 2 fuse 32 30a
Fan 2 relay
Fan 3 relay
Hot at all times
K14
K15
K18
K19
L14
Left cooling fan motor (on left side of radiator)
Low ref
M14
M15
M18
M19
Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
Relay ctrl
Right cooling fan motor (on right side of radiator)
Underhood fuse block (mounted to right strut tower)

CRUISE CONTROL

3.6L VIN 7

3.6L VIN 7, Cruise Control Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Cruise Control Wiring Diagram for Buick LaCrosse CX 2005:

(behind steering wheel) inflatable restraint steering wheel module coil
(left front of engine compartment)
10 volt ref
5 volt reference a
5 volt reference b
8.25k
A12
Accelerator pedal position (app) sensor (under left side of dash)
App sensor 1 signal
App sensor 2 signal
Bcm class 2 data
Body control module (bcm) (behind left side of dash)
Body control module(bcm) (behind left side of dash)
Brake pedal position sensor (under left side of dash)
C2 a2
C2 e3
C275
C277
Computer data lines
Cruise control on ind
Cruise fuse 2a
E2 c1
Engine control module(ecm) (top of engine)
F3 c1
G201 (behind lower left side of dash, left of steering column)
Gmlan serial bus+
Gmlan serial bus-
Hot in acc or run
Left steering wheel controls
Low ref
Low reference
Pnk
R/a 4.42k
Right steering wheel controls
S/c 1.5k
S233
Set/coast resume/ accelerate signal
Stop lamp sig
Stop switch sig
Tan
Transmission control module(tcm)
Underhood fuse block (mounted to right strut tower)
Vehicle speed sensor (oss) (on transmission output shaft)
Vss sig high
Vss sig low

3.8L VIN 2

3.8L VIN 2, Cruise Control Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Cruise Control Wiring Diagram for Buick LaCrosse CX 2005:

(behind steering wheel) inflatable restraint steering wheel module coil
10 volt ref
5 volt ref
8.25k
A12
Accelerator pedal position (app) sensor (under left side of dash)
App sens 1 sig
App sens 2 sig
Automatic transmission
Body control module (bcm) (behind left side of dash)
Body control module(bcm) (behind left side of dash)
Brake pedal position sensor (under left side of dash)
C2 a2
C2 e3
C275
C277
Cruise control on ind
Cruise fuse 2a
E2 c1
F3 c1
G201 (behind lower left side of dash, left of steering column)
Hot in acc or run
Left steering wheel controls
Low ref
Oss high signal
Oss low signal
Pnk
Power train control module (inside air cleaner assembly)
R/a 4.42k
Right steering wheel controls
S/c 1.5k
S233
Set/coast resume/ accelerate signal
Stop lamp sig
Stop switch sig
Tan
Throttle actuator control(tac) module (attached to
Throttle body)
Uart serial data 1
Uart serial data 2
Underhood fuse block (mounted to right strut tower)
Vehicle speed sensor (vss)

DEFOGGERS

Defoggers Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Defoggers Wiring Diagram for Buick LaCrosse CX 2005:

(inside left door sill, forward of left front seat) g301
(inside right door sill, forward of right front seat) g302
(on rear window)
Automatic a/c
Batt main fuse 28 40a
Bcm class 2 serial data c1
Body control module (behind left side of dash, left of steering column)
Compass data sig
Defogger on ind
Driver information center (dic)
Driver outside rearview mirror
Electronic compass module (top left side of rear package shelf)
F11
Hot at all times
Htd/ mir fuse 10a
Hvac class 2 serial data
Hvac control module (center of dash)
I/p fuse block (behind right side of dash, in glove box opening)
Logic
Manual a/c
Message center
Passenger outside rearview mirror
Rear defog on
Rear defog relay ctrl
Rear defog relay ctrl c2
Rear defogger switch
Rear window defogger grid
Red
Rr defog relay
Sp205 (right side of upper left footwell)
Trim monitor digital direct readout display
Underhood fuse block (mounted to right strut tower)

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Electronic Power Steering Wiring Diagram for Buick LaCrosse CX 2005:

A9 c5
Abs fuse 23 10a
Abs mtr fuse 31 40a
Abs sol fuse 19 25a
Battery
C1 c5
C2 c4
Electronic brake control module (ebcm) (left side of engine compt, part of brake pressure modulator valve)
G115 (3.6l: mounted to bank no. 1 cylinder head above exhaust manifold) (3.8l: on transmission stud, to right of starter)
Ground
Hot at all times
Hot in run or start
Ign 1
Magnasteer actuator (left rear of engine compt)
Pnk
Red
Underhood fuse block (mounted to right strut tower)
Var effort steer act cntrl
Var effort steer act pwr

ENGINE PERFORMANCE

3.6L VIN 7

3.6L VIN 7, Engine Performance Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005:

(bottom of oil pan) engine oil level/temperature sensor
(eng harn, 15.5 in from ecm breakout) s120
(left front of engine block) engine oil pressure sensor
+5v
+5v ref
Charging system
Ckp hi
Ckp sens lo
Cmp sig
Cmp sol ctrl
Crankshaft position sensor (right rear of engine block)
Drain
Ect sig
Engine control module (top of engine)
Evap sol ctrl
Fuel injectors
G103 (even bank cylinder head)
Gen fdc sig
Gen to sig
Heated oxygen sensor 1 (rear of cylinder head in exhaust manifold)
Heated oxygen sensor 2 (in exhaust, rear of catalytic converter)
Ho2s hi sig
Ho2s lo ctrl
Ho2s pmp ct
Ic 1 sig
Ic 2 ctrl
Ic 3 ctrl
Ic 4 sig
Ic 5 ctrl
Ic 6 ctrl
Inj 1 ctrl
Inj 2 ctrl
Inj 3 ctrl
Inj 4 ctrl
Inj 5 ctrl
Inj 6 ctrl
Knock sensor bank 1 (right side of engine)
Knock sensor bank 2 (left side of enigne block)
Ks 1 sig
Ks 2 sig
Low ref
Map sig
Nca
Oil lev sig
Oil pres sig
Oil tmp sig
Pnk
Pnk d
S104
S108
Tac mtr ctrl
Tan
Tp sig
Tp2 sig

3.6L VIN 7, Engine Performance Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005:

(engine harn, 2 in from ecm breakout)
A11
C11
Cnstr fuse 10a
D11
Elek ign fuse 15a
Emis- sion fuse 10a
Etc fuse 17 15a
F12
Fuel inj fuse 15a
Fuel pp fuse 22 15a
Fuel pump relay
G115
G115 (mounted to bank 1 cylinder head)
G130
G131
Hot at all times
Hot in run or start
I/p fuse block (behind right side of dash)
Ign 1 relay
Ignition coil 1
Ignition coil 2
Ignition coil 3
Ignition coil 4
Ignition coil 5
Ignition coil 6
Nca
O2 ssr fuse 15a
P/train relay
Pcm fuse 15 10a
Pcm/etc fuse 16 15a
Pnk
S106
S110
S130
S131
S132
S133
S146
Spark plug
Tan
Under- hood fuse block (mounted to right strut tower)

3.6L VIN 7, Engine Performance Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005:

(engine harn, 13.5 cm from ecm breakout)
(front of left cyl head)
(front of right cyl head)
+5v
A/c refrigerant pressure sensor (on accumulator)
Camshaft position actuator solenoid (exhaust bank 1)
Camshaft position actuator solenoid (exhaust bank 2)
Camshaft position actuator solenoid (intake bank 1)
Camshaft position actuator solenoid (intake bank 2)
Camshaft position sensor (exhaust bank 1)
Camshaft position sensor (intake bank 1)
Camshaft position sensor (intake bank 2)
Engine coolant temperature sensor (left side of engine block)
Evap canister purge solenoid (top rear of engine)
Low ref
Manifold absolute pressure sensor (in air intake tube)
Mass airflow/ intake air temperature sensor (at rear of engine)
Pnk
S119
S121
Signal
Tan
Throttle actuator control module (at throttle body)

3.6L VIN 7, Engine Performance Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005:

(in fuel tank) fuel tank pressure sensor
(mounted to bank 1 cylinder head)
(mounted to c1 right strut tower)
(mounted to right strut c1 tower)
+5v ref
+5v ref a
+5v ref c
A/c ref pres
A/c system
Acc
Acc volt
Accelerator pedal
Anti-lock brake system
App sens 2 sig
App sens sig
Automatic transmission manual shift shaft switch assembly
B12
Battery +
Body control module (behind left side of steering col)
Cc sw sig
Class 2 data
Clu rly ctrl
Computer data lines system
Cooling fans system
Cruise control system
D10
D12
Delv torque sig
E11
Eng spd sig
Engine control module (top of engine)
Evap canister vent solenoid (behind wheelwell)
Evap sol ctrl
Fan rly ctrl
Fuel lev sig
Fuel level sensor
Fuel pump/ sender assembly
G115
G302
Gmlan bus
Ho2s hi sig
Ho2s lo ctrl
Ho2s lo sig
Hot at all times
I/p fuse block (behind left side of dash)
I/p fuse block (behind right c1 side of dash)
Iat sig
Ign 1 volt
Ignition switch
Instrument panel cluster
Lan bus +
Lan bus -
Lock
Logic
Low ref
Maf sig
Main rly ctrl
Malfunction indicator lamp
Mil ctrl
Navigation system
P/n sig
Pnk
Position sensor (under left side of dash)
Req torq sig
Rly coil ctrl
Rly ctrl
Run
S118 (12 in from under- hood fuse block)
Ser data bus
Start
Starting system
Stop lamp sw sig
Stop lp sw
Tan
Tank pres sig
Transmission control module
Underhood fuse block
Underhood fuse block (on right strut tower)
Underhood fuse block c1 (mounted to right strut tower)
Vss

3.8L VIN 2

3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2005:

(below power steering pump) engine oil pressure switch
(fuel injector harn, on top of engine)
(on throttle body assembly) throttle position sensor
(on transaxle stud, near starter) g113
(pins 62-72 not used)
(top right rear of engine, near throttle body) exhaust gas recirculation valve
5 volt ref
Air sol ctrl
Cmp sensor
Ect sensor sig
Egr pos sig
Egr sol high
Egr sol low
Engine coolant temperature sensor (vin 2: top right of intake manifold) (vin 4: top left rear of engine)
Engine oil pressure switch (below pwr steering pump)
Evap canister purge solenoid (below throttle body)
Evap purge sol
Fuel inj 1
Fuel inj 2
Fuel inj 3
Fuel inj 4
Fuel inj 5
Fuel inj 6
Fuel injectors
G113 (on transmission stud, near starter)
Gen field
Gen on sig
Generator
Ground
Heated oxygen sensor (ho2s) 1 (in right bank exhaust manifold)
Ho2s heater 1
Ho2s sig high
Ho2s sig low
Ic timing ctrl
Ic timing sig
Knock sensor bank 1 (right side of engine, above starter)
Knock sensor bank 2 (right side of engine, below exhst manifold)
Knock sensor 1
Knock sensor 2
Low eng speed
Low ref
Map sensor sig
Med eng speed
Nca
Oil level sw
Oil press sig
Pnk
Powertrain control module (left front side of engine compt, in air cleaner assembly)
Red
S101
S109
Spark timing
Tan
Uart data

3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2005:

(front of engine) camshaft position sensor
(front of engine) crankshaft position sensor
(icm harn, top of engine, near icm)
(lower left side of engine block)
2ndary uart
5 volt ref
A11
Aap sensor 1
Accelerator pedal position switch (under left side of dash)
App sensor 2
Body control module
C11
Elek ign fuse 24 15a
Etc fuse 17 15a
From p/train relay (diagram 4 of 5)
Fuel inj fuse 20 15a
G112
G113 (on transaxle stud, near starter)
Ground
Hot in run or start
Ign 1 volt
Ignition control module (icm) (top left front of eng)
Low ref
Pnk
Primary uart
S101
S102
S144
S145
Secondary air injection control solenoid valve/pressure sensor (sulev) (right side of engine)
Secondary air injection solenoid relay (sulev)
Spark plugs
Stop lamp
Stop lamp switch signal
Tan
Throttle actuator control module (on throttle body)
Trans sol fuse 21 10a
Underhood fuse block (mounted to right strut tower)
Vehicle spd

3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2005:

1-2 shift solenoid
2-3 shift solenoid
A/t fluid temp sensor
Air pres sens
At iss sig
Automatic transaxle
Boost sol
G113 (on transaxle stud, near starter)
Ho2s heater 2
Ho2s sig high 2
Ho2s sig low 2
Iat sensor sig
Input shaft speed sensor
Low ref
Maf sensor sig
Oss sig
Pc sol
Pnk
Powertrain control module (left front side of engine compt, in air cleaner assembly)
Pressure control solenoid
Red
S101
Shift sol a
Shift sol b
Tan
Tcc release switch
Tcc sol
Tcc sw sig
Tft sensor sig
Torque converter clutch solenoid
Tr sw a
Tr sw b
Tr sw c
Tr sw p
Trans- mission internal mode switch
Vehicle speed sensor (lower right side of engine compt, on transaxle)

3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2005:

(in air cleaner duct)
(w/ stabilitrak)
(w/o stabilitrak)
Air pump fuse 25 50a
Cnstr fuse 10a
D11
Electronic brake control module (left side of engine compt)
Emission fuse 12 10a
Evap canister vent solenoid (behind left rear wheelwell)
F12
Fuel pp fuse 22 15a
Fuel pp relay
G113 (on transaxle stud, near starter)
G115 (on transmission stud, right of starter)
Heated oxygen sensor (ho2s) 2 (rear of catalytic converter)
Hot at all times
I/p fuse block (behind right side of dash)
Iat
Intake air temperature/ mass air flow sensor
Maf
Nca
O2 ssr fuse 14 15a
P/train relay
Pnk
Red
S114
S117
Secondary air injection pump (sulev) (left rear of engine)
Secondary air injection pump relay (sulev) (on left front frame rail)
Tan
To p/train fuses (diagram 2 of 5)
Underhood fuse block (mounted to right strut tower)

3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2005:

(left side of dash)
(left side of engine compt) a/c refrigerant pressure sensor
(right door sill, forward of right front seat) g302
(right side
5 volt ref
A/c clutch relay
A/c press sig
A/c system
A12
A7 c2
Acc
B12
Battery
C1 d8
C12
Class 2 data
Clstr fuse 10a
Cooling fans system
Cruise control system
Cruise sig
D1 c1
D10
D12 c2
Data link connector (under left side of dash, right of steering column)
E11
Eng speed sig
Evap vent sol
F c405
F11
Fuel level sig
Fuel pump & sender assembly
Fuel pump relay
Fuel tank
Fuel tank press
Fuel tank pressure sensor
G202
High fan
Hot at all times
Hot in run or start
I/p fuse block (behind right side of dash)
Ignition 1
Ignition 3
Ignition switch
Instrument panel cluster
Lock
Low fan
Low ref
Malfunction indicator lamp (mil)
Mil control
Pcm fuse 15 10a
Pcm relay
Pcm/etc fuse 16 15a
Pnk
Powertrain control module (left front side of engine compt, in air cleaner assembly)
Relay ctrl
Run
S211
Splice pack sp205
Start
Starter enable
Starting system
Stop lamp sw
Underhood fuse block (mounted to right strut tower)
Upper left footwell)
Vehicle speed sig

EXTERIOR LIGHTS

Exterior Lamps Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Exterior Lamps Wiring Diagram for Buick LaCrosse CX 2005:

(behind left side of rear bumper, in object sensor & license lamp harn) s402
(mounted to right strut tower) underhood fuse block
10 volt ref
Anti-lock brakes or engine controls system
Anti-lock brakes, engine controls or transmissions systems
Auto
Bcm class 2
Bcm class 2 serial data
Body control module (behind left side of dash, left of steering column)
Brake pedal position sensor (under left side of dash)
C1 c2
C1 e2
C1 f2
C2 e11
C2 f9
C3 a9
Center high mounted stop lamp (chmsl)
Chmsl/ bkup fuse 15a
Computer data lines system
Driver information center
G100 (in back of right headlamp. on frame)
G101 (left side of front end upper tie bar, in back of headlamp)
G202 (right door sill, forward of right front seat)
G301 (inside left door sill, forward of left front seat)
G302 (right door sill, forward of right front seat)
Hazard
Hazard sw sig
Hazrd fuse 20a
Head
Hot at all times
I/p fuse block (behind right side of dash)
Instrument panel cluster (ipc)
Ipc class 2 serial data
Lamp switch assembly
Left
Left front marker lamp
Left front park/ turn signal lamp
Left license lamp
Left rear marker lamp
Left tail/ stop & turn signal lamp
Left turn indicator
Left turn sw sig
Logic
Low ref
Lower left tail lamp
Lower right tail lamp
Lr stop/turn volt
Nca
Off
Park
Park lamp on sig
Park lmp rly ctrl
Prk lamp fuse 10a
Prk lamp relay
Right
Right front marker lamp
Right front park/ turn signal lamp
Right license lamp
Right rear marker lamp
Right tail/ stop & turn signal lamp
Right turn indicator
Right turn sw sig
Rr stop/turn volt
S111
S112
S113
S124
S211
S214
S303
S401
S406
S407 (body wiring harn, inside right side of rear compt, 78.5 cm from breakout to c405)
Stop lamp sw sig
Tan
Turn audible indicator
Turn signal/ multifunction switch
Upper left tail lamp
Upper right tail lamp
Volt
Volt (+)

3.6L VIN 7

3.6L VIN 7, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2005:

(mounted to bank 1 cylinder head)
Automatic transaxle
Backup lamp sply volt
Battery volt (+)
Body control module (behind left side of dash, left of steering column)
Chmsl/ bkup fuse 15a
Computer data lines system
Exterior lights system
G115
G301 (inside left door sill, forward of left front seat)
G302 (right door sill, forward of right front seat)
Gmlan ser data
Ground distribution system
Hot at all times
I/p fuse block (behind right side of dash)
Left backup lamp
Lower left tail lamp
Lower right tail lamp
Navigation system
Pcm class 2 serial data
Right backup lamp
S303
S406
Tr sw a
Tr sw b
Transmission control module (tcm) (left front of engine compt)
Transmission internal mode switch (ims)

3.8L VIN 2

3.8L VIN 2, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2005:

(on transaxle stud, near starter)
Automatic transaxle
Backup lamp sply volt
Battery volt (+)
Body control module (behind left side of dash, left of steering column)
Chmsl/ bkup fuse 15a
Computer data lines system
Exterior lights system
G113
G301 (inside left door sill, forward of left front seat)
G302 (right door sill, forward of right front seat)
Ground distribution system
Hot at all times
I/p fuse block (behind right side of dash)
Left backup lamp
Lower left tail lamp
Lower right tail lamp
Navigation system
Pcm class 2 serial data
Powertrain control module (left front side of engine compt, in air cleaner assembly)
Right backup lamp
S101
S303
S406
Tr sw a
Tr sw b
Transmission internal mode switch (ims)

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2005

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List of elements for Ground Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2005:

(3.6l) engine control module (ecm)
(mounted to right strut tower) underhood fuse block
(sulev) secondary air injection (air) control solenoid valve/ pressure sensor bank 2
3.6l
3.8l
A/c clu diode
A/c compressor clutch
Automatic transaxle
B b
B11
Battery
Body control module (bcm)
C100
Electronic brake control module (ebcm)
Engine oil level switch
Engine oil pressure (eop) switch
Except sulev
Fan 2 relay
Frame rail, behind bumper)
From g115)
Fuel pp relay
G100 (in back of right headlamp on frame)
G101 (left side of front end upper tie bar, in back of headlamp)
G102 (3.6l) (below right front strut tower)
G102 (3.8l) (near battery)
G103 (redundant ground from ecm to even bank cylinder head)
G111 (3.6l) (lower left front of engine, on
G111 (3.8l) (lower left side of engine)
G113 (lower left front of engine, on transmission stud, near starter)
G115 (mounted to bank 1 cylinder head, above exhaust manifold)
G115 (on transmission stud, to right of starter)
Headlamp module
Hood ajar switch
Horn assembly
Ign 1 relay
K14
Left front fog lamp
Left front marker lamp
Left front park/ turn signal lamp
Left high beam headlamp
Left low beam headlamp
Mass air flow (maf) sensor/ intake air temperature (iat)
Powertrain control module (pcm)
Right cooling fan
Right front fog lamp
Right front marker lamp
Right front park/ turn signal lamp
Right high beam headlamp
Right low beam headlamp
S101 (in engine wiring harness, in left front of engine compt, 5 cm from pcm breakout)
S102 (in engine harn, top of engine, 5 cm from throttle actuator control module breakout)
S111
S113
S116
S124 (forward lamp wiring harness, behind right headlamp, 5 cm from c142 breakout)
Secondary air injection (air) pump (sulev)
Sulev
Throttle actuator control (tac) module
Transmission control module (tcm)
Transmission internal mode switch (ims)
Transmission stud)
Windshield washer fluid level switch
Windshield washer fluid pump

Ground Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2005

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List of elements for Ground Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2005:

(3.8l) ignition control module (icm)
(in on-engine harness)
(top rear of cylinder head)
(w/ lumbar seats) driver seat lumbar switch
3.6l
A c2
A/t shift lock control solenoid
B c2
Body control module (bcm)
C275
C277
Cruise control switch
Cylinder head)
Driver back heated seat element
Driver door lock
Driver door lock switch
Driver heated seat relay
Driver seat adjuster switch
Driver seat belt switch
Driver window switch
Drivers outside rearview mirror motor
Electronic compass module
From g301 breakout)
G112 (in right side of engine, on ignition control module bracket)
G130 (near ignition coils 1, 3, & 5)
G131 (near ignition coils 2, 4, & 6)
G201 (below dash, bolted to dash carrier)
G301 (inside left door sill, forward of left front seat)
Harness)
Horn switch
Ignition coil 1
Ignition coil 2
Ignition coil 3
Ignition coil 4
Ignition coil 5
Ignition coil 6
Inflatable restraint steering wheel module
Inflatable restraint steering wheel module coil
Left backup lamp
Left license lamp
Left rear door lock
Left rear marker lamp
Left steering wheel controls
Left tail/stop & turn signal lamp
Logic
Lower left tail lamp
Nca
Outside rearview mirror switch
Passenger back heated seat element
Passenger heated seat relay
Passenger seat adjuster switch
Passenger seat belt switch
Prndl lamp
Rear object sensor control module
Rear window defogger grid
Right license lamp
Right steering wheel controls
S130
S131
S215 (in steering column, harn, 4.5 cm from from windshield wiper/washer switch breakout)
S330 (driver seat wiring harness, below driver seat, 4.5 cm to seat belt switch breakout)
S333 (front passenger seat harness, below seat, 7 cm from seat belt pretensioner breakout)
S500 (in driver's door, above door speaker)
Upper left tail lamp
Voice recorder/ cruise assembly switch
W/ accessory steering wheel control
W/ console shift
W/ heated seats
W/ park assist
W/ power seats
W/o power seats
Windshield wiper motor

Ground Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2005

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List of elements for Ground Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2005:

(automatic a/c) inside air temperature sensor
(digital audio system s-band) digital radio receiver
(in dash harn, at center of dash)
(mounted to right strut tower) underhood fuse block
(right front door wiring harness, 25.5 cm from c304 breakout)
A/t shift lock control actuator
A12 c1
A15
A6 c1
Ambient light sensor
Audio amplifier
Automatic a/c
Auxiliary power outlet
B8 c1
Blower motor control processor
Body control module (bcm)
Brake fluid level switch
C1 b5
Center high mounted stop lamp (chmsl)
Cigar lighter
Column shift
Console shift
Custom 9 speaker system
D c1
Data link connector (dcl)
Data link connector (dlc)
Driver information center (dic)
E15
F c1
F14
F7 c2
Front passenger door lock
Front passenger door lock switch
Front passenger window switch
Fuel pump & sender assembly
G c2
G200 (center of dash cross beam, behind radio)
G202 (left side of dash, at base of steering column)
G302 (right door sill, forward of right front seat)
Garage door opener
Gps vehicle communication system
Hvac control module
I/p compartment lamp switch
I/p fuse block (behind left side of dash)
If equipped
Ignition lock cylinder control actuator
Ignition switch
Inflatable restraint front passenger presence system (pps) module
Inflatable restraint passenger air bag on/off indicator
Inflatable restraint sensing & diagnostic module (sdm)
Inside rearview mirror
Instrument panel cluster (ipc)
Lamp switch assembly
Left dome/ reading lamp
Left i/p courtesy lamp
Left vanity mirror lamp
Lower right tail lamp
Manual a/c
Nca
Overhead console reading lamps
Passenger outside rearview mirror motor
Radio
Rear compartment lid latch
Remote control door lock receiver (rcdlr)
Right backup lamp
Right dome/ reading lamp
Right i/p courtesy lamp
Right rear door lock
Right rear marker lamp
Right tail/stop & turn signal lamp
Right vanity mirror lamp
S211
S213
S214
S300 (in floor harn, at right front kick panel)
S309
S390 (in roof harness, near center of windshield header, 20 cm from dome/ reading lamp right breakout)
S406 (body wiring harness, below rear window panel, 9 cm from c356 breakout)
S604
S605 (right front door wiring harn, 5 cm from door lock switch breakout)
Sunload sensor assembly
Sunroof module
Theft deterrent exciter module
Theft led
Turn signal/ multifunction switch
Upper right tail lamp
Vehicle communication interface module (vcim)
Windshield wiper motor
Wiper hi relay 44
Wiper relay 45

HEADLIGHTS

Headlights Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Headlights Wiring Diagram for Buick LaCrosse CX 2005:

3.6l
3.8l
A10
A11
A12
Ambient light sensor (top of dash)
Auto
Auto a/c
B(+)
B11
B12
B3 c1
Bcm
Bcm class 2 serial
Body control module (bcm) (behind left side of dash, left of steering column)
C10
C12
Clstr fuse 10a
Computer data lines system
Drl ambient light
E10 c2
E19
E20
Exterior lamps off
Flash to pass sw
Fog
Fog lamp ind
Fog lamp relay ctrl
Fog lp relay 36
Fog lps fuse 7 10a
Front fog lamp sw
Ftp
G100 (back of right headlamp, on frame)
G101 (back of left headlamp, on tie bar)
G113 (lower left front of eng, near starter)
G115 (on bank 1 cyl head, abv exhaust manifold)
G19
G20
G202 (left side of dash, base of steering column)
Gnd
Hdlp suggest ind
Head
Headlamp dimmer sw
Headlamp module 35
Headlamp on sig
Hi beam relay
Hi beam rly ctrl
High
High beam ind
Hot at all times
I/p fuse block (behind right side of dash)
Instrument panel cluster (ipc)
Lamp switch assembly
Left front fog lamp
Left high beam headlamp
Left low beam headlamp
Lf hi beam fuse 1 10a
Lf lo beam fuse 3 10a
Logic
Low
Manual a/c
Off
Park
Rf hi beam fuse 2 10a
Rf lo beam fuse 4 10a
Right front fog lamp
Right high beam headlamp
Right low beam headlamp
S101
S111
S112
S113
S116
S124
S211
S214
Serial data
Sunload sensor assembly (top center of dash)
Turn signal/ multifunction switch
Underhood fuse block (mounted to right strut tower)
Voltage sply

HORN

Horn Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Horn Wiring Diagram for Buick LaCrosse CX 2005:

(below dash, bolted to dash carrier) g201
A2 c3
Body control module (bcm) (behind left side of dash)
C275 c
C277 c
G100 (behind left head light)
Horn assembly (right front of vehicle)
Horn fuse 11 11a
Horn relay
Horn rly ctrl
Horn switch
Hot at all times
Inflatable restraint steering wheel module (on steering wheel)
Inflatable restraint steering wheel module coil (behind steering wheel, in steering column)
Logic
Underhood fuse block (mounted to right strut tower)

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram, U2E for Buick LaCrosse CX 2005

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List of elements for Instrument Cluster Wiring Diagram, U2E for Buick LaCrosse CX 2005:

(left side of dash, base of steering column) g202
Abs indicator
Abs/tcs class 2 serial data
Air bag indicator
Bat pos voltage
Bcm class 2 serial data
Brake fluid level switch (brake fluid reservoir)
Brake indicator
Brake warning ind ctrl
Charge indicator
Check tire pressure indicator
Clstr fuse 10a
Computer data lines system
Cruise indicator
Door ajar indicator
E8 c1
Engine controls system
Engine coolant temperature gauge
Fuel gage
G202 (left side of dash, base of steering column)
Gas cap indicator
Gnd
Hdlp suggest indicator
High beam indicator
Hot at all times
Hot coolant indicator
I/p fuse block (behind right side of dash)
Instrument panel cluster (ipc)
Interior lights system
Ipc class 2 serial data
Ipc/bcm class 2 serial data
Km/h indicator
Left turn indicator
Logic
Low fuel indicator
Low ref
Low wash indicator
Malfunction indicator lamp (mil)
Mil ctrl
Mph indicator
Pass seat belt ind
Pcm class 2 serial data
Pcm/ecm class 2 serial data
Reduced eng pwr indicator
Right turn indicator
S211
Sdm class 2 serial data
Seat belt indicator
Security indicator
Service vehicle soon indicator
Speedometer
Tachometer
Traction control off indicator
Trunk ajar indicator
Turn audible indicator

Instrument Cluster Wiring Diagram, UH8 (1 of 2) for Buick LaCrosse CX 2005

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List of elements for Instrument Cluster Wiring Diagram, UH8 (1 of 2) for Buick LaCrosse CX 2005:

(left side of dash, base of steering column) g202
Abs indicator
Abs/tcs class 2 serial data
Air bag indicator
Air temp sens sig
B+ bcm class 2 serial data
B+ pcm/ecm class 2 serial data
B10
Bat pos voltage
Bcm class 2 serial data
Brake fluid level switch (brake fluid reservoir)
Brake indicator
Brake warning ind ctrl
C2 a9
Change oil indicator
Charge indicator
Check tire pressure indicator
Clstr fuse 10a
Compass sens feed
Compass sens ret
Computer data lines system
Cruise indicator
D11
Defogger system
Dic fuel signal
Dic gage signal
Dic menu sw sig
Dic odo sig
Dic set/reset sw sig
Display fuse 18 10a
Door ajar indicator
E8 c1
Electronic compass module (top right side of rear package shelf)
Engine controls system
Engine coolant temperature gauge
Fog lamp indicator
Fuel gage
G202 (left side of dash, base of steering column)
G301 (inside left door sill, forward of left front seat)
Gnd
High beam indicator
Hot at all times
Hot coolant indicator
Hot in run or start
I/p fuse block (behind right side of dash)
I/p fuse block (left side of dash)
Ign 1 voltage
Instrument panel cluster (ipc)
Interior lights system
Ipc class 2 serial data
Ipc/bcm class 2 serial data
Km/h indicator
Left turn indicator
Logic
Low coolant level indicator
Low fuel indicator
Low oil level indicator
Low oil pressure indicator
Low ref
Malfunction indicator lamp (mil)
Message center
Mil ctrl
Mph indicator
Pass seat belt ind
Pcm class 2 serial data
Pcm/ecm class 2 serial data
Pnk
Power distribution system
Rear defog rly ctrl
Red
Right turn indicator
S211
S303
Sdm class 2 serial data
Seat belt indicator
Security indicator
Service vehicle soon indicator
Speedometer
Tachometer
Tan
Traction control off indicator
Trunk ajar indicator
Turn audible indicator
Ud7
Underhood fuse block (right strut tower)

Instrument Cluster Wiring Diagram, UH8 (2 of 2) for Buick LaCrosse CX 2005

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List of elements for Instrument Cluster Wiring Diagram, UH8 (2 of 2) for Buick LaCrosse CX 2005:

Ambient air temperature sensor (near center front of radiator)
Anti-lock brakes system
Driver information center (dic)
E/m (base) set/reset (uplevel)
Exterior lights system
Fuel
G202 (left side of dash, base of steering column)
Gauges
Hazard
Info
Interior lights system
Pnk
Red
S211
Tan
Traction control
Trip odo
Uplevel

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Courtesy Lamps Wiring Diagram for Buick LaCrosse CX 2005:

(inside left door sill, forward of left front seat) g301
(left side of dash, at base of steering column) g202
(right door sill, forward of right front seat) g302
(roof harness, 7.5 cm from courtesy/reading lamp breakout)
Battery positive voltage
Body control module (behind left side of dash, left of steering column)
Courtesy defeat sw
Courtesy lamp sw on sig
D10
Defeat
Dome
Driver door lock
Front passenger door lock
G200 (center of dash cross beam, behind radio)
G302 (right door sill, forward of right front seat)
Hot at all times
I/p compartment lamp & switch
I/p fuse block (behind right side of dash)
Inside rearview mirror lamp
Int/illum fuse 10a
Lamp switch assembly
Left courtesy/ reading lamp
Left dome/ reading lamp
Left i/p courtesy lamp
Left rear door lock
Left vanity mirror lamp
Lf door open sw sig
Lr door open sw sig
Off
Open
Overhead console reading lamp
Power courtesy lamp
Rear compartment courtesy lamp
Rear compartment lid latch
Rf door open sw sig
Right courtesy/ reading lamp
Right dome/ reading lamp
Right i/p courtesy lamp
Right rear door lock
Rr door open sw sig
S211
S213
S303
S390
S398
S406
S416
S500
S604
Tan

Instrument Illumination Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Instrument Illumination Wiring Diagram for Buick LaCrosse CX 2005:

(right door sill, forward of right front seat) g302
Auto
Auto a/c
Battery positive voltage
Bcm class 2 serial data
Body control module (behind left side of dash, left of steering column)
Computer data lines system
Cruise control switch
Driver door lock switch
Driver information center (dic)
Driver window switch
F c275
F c277
Front passenger door lock switch
Front passenger window switch
G200 (center of dash cross beam, behind radio)
G201 (below dash, bolted to dash carrier)
G202 (left side of dash, at base of steering column)
G301 (inside left door sill, forward of left front seat)
Ground
Head
Hot at all times
Hvac control module (at center of dash)
I/p fuse block (behind right side of dash)
Illum
Inflatable restraint steering wheel module coil
Instrument panel cluster (ipc)
Int/ illum fuse 10a
Ip dimming control
Ip dimming return
Ip dimming voltage ref
Lamp switch assembly
Left steering wheel controls
Manual a/c
Off
Outside rearview mirror switch
Park
Park lamp sw on sig
Pnk
Prndl lamp
Radio
Right steering wheel controls
S203 (i/p harness, below center of dash, 4 cm from data link breakout)
S211
S213
S215
S277
S280
S303
S501
S502 (in driver's door harness, below window switch assy)
S605
Str whl/ illum fuse 2a
Voice recorder/ cruise switch assembly

NAVIGATION

Parking Assistant Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Parking Assistant Wiring Diagram for Buick LaCrosse CX 2005:

(inside left door sill, forward of front seat) g301
Backup lamp sply voltage
Body control module (behind left side of dash, left of steering column)
C1 e10
C2 b11
C2 e3
Center amber ind
Center amber ind ctrl
D11
Display fuse 18 10a
Engine control module (ecm) (3.6l) (top of engine)
Exterior lights & mirrors systems
F11
Ground
Hot in run & start
I/p fuse block (behind left side of dash)
Ign 1 voltage
Left amber ind
Left amber ind ctrl
Left rear corner object sensor (left corner of rear bumper)
Left rear middle object sensor (left middle of rear bumper)
Low reference
Lr corner object sens sig
Lr middle object sens sig
Object sens low ref
Object sens sply voltage
Pnk
Powertrain control module (pcm) (3.8l) (left front side of engine compt, in air cleaner assembly)
Rear object sensor control module (center of rear package shelf)
Rear parking assist (rpa) diagnostic connector (left side of trunk)
Rear parking assist (rpa) display
Rear parking assist chime
Rear parking assist chime sig
Rear parking diagnostic sig
Red
Red ind
Red ind crtl
Right rear corner object sensor (right corner of rear bumper)
Right rear middle object sensor (right middle of rear bumper)
Rr corner object sens sig
Rr middle object sens sig
S303
S420 (in trunk, at base of right rear strut tower)
S450 (behind right side of rear bumper)
S451 (behind right side of rear bumper)
Sensor signal
Telltale assembly sply voltage
Underhood fuse block (mounted to right strut tower)
Vehicle speed sig
Vss sig

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005

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List of elements for Power Distribution Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005:

(below driver seat, 36 cm from c311) s331
(in headliner harn, at right front of headliner) s394
(mounted to right strut tower) underhood fuse block
3.6l
3.8l
A1 c1
Abs mtr fuse 31 40a
Abs sol fuse 19 25a
Air pump fuse 25 50a
Audio amplifier (w/ 9 speaker system)
Automatic a/c
B10
Batt main 1 fuse 26 40a
Batt main 2 fuse 27 50a
Batt main 3 fuse 28 40a
Batt main 4 fuse 30 30a
Battery
Blower motor control processor
Body control module (bcm)
C1 b1
C1 d12
C10
C2 d9
C2 e2
C2 f9
C4 c2
Canister fuse 10a
Chmsl/ bkup fuse 15a
Clstr fuse 10a
D10
Data link connector (dlc)
Digital radio receiver
Dr/lck trunk fuse 15a
Driver heated seat relay
Driver seat adjuster switch
Driver seat lumbar switch
Driver window switch
E c1
E c2
E12
Electronic brake control module (ebcm) (w/ abs)
Engine control module (ecm)
Evaporative emission (evap) canister vent solenoid
F10
Front passenger window switch
Generator
Htd/ seat fuse 20a
Hvac control module
Hvac fuse 10a
I/p fuse block (behind right side of dash)
Inflatable restraint front passenger presence system (pps) module
Inside rearview mirror
Instrument panel cluster (ipc)
Int illum fuse 10a
Manual a/c
Onstar/ aldl fuse 10a
Outside rear view mirror switch
Park switch
Passenger front heated seat relay
Passenger seat adjuster switch
Pcm/ etc fuse 16 15a
Power lumbar control seat
Powertrain control module (pcm)
Prk/ lamp relay
Prk/ switch fuse 5a
Prk/lamp fuse 10a
Pwr wndw circuit breaker 25a
Pwr/ mir fuse 10a
Pwr/ seat circuit breaker 25a
R/ defog relay
Radio
Rap relay
Rdo amp fuse 25a
Red
Remote control door lock receiver (rcdlr)
Rfa/ mod fuse 10a
S/roof fuse 20a
S395
Secondary air injection (air) pump relay (sulev)
Starter
Sunroof motor/ actuator
To aux pwr fuse 10 (diagram 2 of 4)
Turn/ hazrd fuse 20a
Vehicle communication interface module (vcim)
W/ digital audio system
W/ driver
W/ sunroof
W/o digital audio system
W/o driver
W/o sunroof
Washer/ rvc fuse 6 15a

Power Distribution Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005

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List of elements for Power Distribution Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005:

(3.6l) g115 (mounted to bank 1 cylinder head, above exhaust manifold)
(3.6l) s116
(3.8l) s101
(center of dash cross beam, behind radio) g200
1-2 shift solenoid valve
12 volt reference
2-3 shift solenoid valve
3.6l
3.8l
A/c clutch fuse 13 10a
A/c comp relay
A10
A11
A2 c1
Abs fuse 23 10a
Acc
Acc lock
Automatic a/c
Automatic transmission
Aux pwr fuse 10 25a
Aux tcm fuse 8 10a
Auxiliary power outlet (under floor console)
Body control module
Body control module (bcm)
C1 a5
C1 b3
C1 b4
C1 d1
C100
C2 a12
C2 b9
C275
C277
Cigar lighter
Crank relay
Crank voltage
Cruise fuse 2a
D11
Display fuse 18 10a
E12
Electronic brake control module (w/ abs)
Electronic compass module
Engine control module (ecm)
F12
From ign 1 relay (diagram 2 of 4)
From washer/rvc a fuse 6 (diagram 1 of 4)
G113 (3.8l) (lower left front of engine, on transmission stud, near starter)
G202 (left side of dash, at base of steering column)
G302 (in right door sill, forward of right front seat)
Hvac control module
I/p fuse block
I/p fuse block (behind right side of dash)
Ign 1 relay
Ignition 1 voltage
Ignition 3 voltage
Ignition switch
Inflatable restraint front passenger presence system module
Inflatable restraint passenger airbag on/off indicator
Inflatable restraint sensing & diagnostic module
Inflatable restraint steering wheel module coil
Inside air temperature sensor
Key in ignition switch
Key in ignition switch signal
Lock
Manual a/c
Nca
Off
P/train relay 40
Pcm fuse 15 10a
Pnk
Powertrain control module (pcm)
Rear object sensor control module
Red
Run
S115
S213
S214
S406
Sir fuse 9 10a
Start
Steering angle sensor (w/ abs)
To a/c clutch fuse (diagram 2 of 4)
To etc fuse 17 (diagram 3 of 4)
To fan 2 fuse (diagram 3 of 4)
Torque converter clutch (tcc) solenoid valve
Trans sol fuse 21 10a
Transmission control module (tcm)
Transmission control module (tcm) (3.6l)
Underhood fuse block (mounted to right strut tower)
Voice recorder/ cruise switch assembly
W/ park assist
Yaw & lateral acceleration sensor (w/ abs)

Power Distribution Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005

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List of elements for Power Distribution Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005:

(engine harness, 5cm pnk from secondary air injection (air) pump relay breakout, toward c100) s117
3.6l
3.8l
A12
A18
A19
C10
C11
Crank relay 48
E14
Emission fuse 12 10a
Engine control module (ecm)
Etc fuse 17 15a
Evaporative emission (evap) canister purge solenoid
Fan 1 fuse 29 30a
Fan 1 relay 42
Fan 2 fuse 32 30a
Fan 2 relay 46
Fan 3 relay 43
Fog lp relay 36
Fog lps fuse 7 10a
From p/train b relay 40 (diagram 2 of 4)
From p/train d relay 40 (diagram 2 of 4)
Fuel pp fuse 22 15a
Fuel pp relay 41
G19
G20
Headlamp module
Heated oxygen sensor (ho2s) 2
Hi beam relay 34
Horn fuse 11 15a
Horn relay 39
K15
K18
K19
Mass air flow (maf) sensor/ intake air temperature (iat)
Pnk
Secondary air injection (air) pump relay
Secondary air injection (air) solenoid relay
Starter fuse 33 40a
Sulev
Throttle actuator control (tac) module
To elek fuse 24 (diagram 4 of 4)
Underhood fuse block (mounted to right strut tower)
Wiper relay 45
Wiper/ws fuse 5 25a

Power Distribution Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005

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List of elements for Power Distribution Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005:

(in engine wiring harn, 5 cm from ignition coil 1) s106
(in engine wiring harn, near injector coils) s103
(in engine wiring harness, on top of engine, 8 cm from fuel injector 3) s109
(in fuel injector wiring harn) s104
(in fuel injector wiring harn) s108
02 ssr fuse 14 15a
3.6l
3.8l
A11
Camshaft position (cmp) actuator solenoid exhaust bank 1
Camshaft position (cmp) actuator solenoid exhaust bank 2
Camshaft position (cmp) actuator solenoid intake bank 1
Camshaft position (cmp) actuator solenoid intake bank 2
D11
Elek ign fuse 24 15a
Evaporative emissions (evap) canister purge solenoid valve
From emission e fuse 12 (diagram 3 of 4)
Fuel inj fuse 20 15a
Fuel injector 1
Fuel injector 2
Fuel injector 3
Fuel injector 4
Fuel injector 5
Fuel injector 6
Heated oxygen sensor (ho2s) sensor 1
Heated oxygen sensor (ho2s) sensor 2
Ignition coil 1
Ignition coil 2
Ignition coil 3
Ignition coil 4
Ignition coil 5
Ignition coil 6
Ignition control module (icm)
Nca
Pnk
Underhood fuse block (mounted to right strut tower)

POWER MIRRORS

Electrochromic Mirror Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Electrochromic Mirror Wiring Diagram for Buick LaCrosse CX 2005:

(right door sill, forward of the right front seat) g302
Ambient light sensor
Automatic day-night mirror element
Body control module (bcm) (behind left side of dash, left of steering column)
C11
Exterior lights system
F1 c2
Gnd
Headlight sensor
Hot at all times
I/p fuse block (behind right side of dash)
Inside rearview mirror
Interior lights system
Logic
Low high sensitivity setting
Low reference
Max
Min
Navigation system
Off
Power tops system
S/roof fuse 20a
S390
S394 (w/sunroof)
S420 (in trunk, at base of right rear strut tower)
Sensitivity setting
Signal

Power Mirrors Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Power Mirrors Wiring Diagram for Buick LaCrosse CX 2005:

Defogger system
Down
Driver
Driver outside rearview mirror
E12
G301 (inside left door sill, forward of left front seat)
Hot at all times
I/p fuse block (behind right side of dash, in glove box opening)
Illum
Interior lights system
Left
Left/ right
Outside rearview mirror switch
Passenger
Passenger outside rearview mirror
Pwr mirs fuse 10a
Right
S501
Up/ down

POWER SEATS

Driver Power Seat Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Driver Power Seat Wiring Diagram for Buick LaCrosse CX 2005:

D10 c2
Driver seat adjuster motor assembly
Driver seat adjuster switch
Forward
Front down
Front up
Front vertical motor
G301 (inside left door sill, forward of left front seat)
Horizontal motor
Hot at all times
I/p fuse block (behind right side of dash)
Nca
Pwr seat circuit breaker 25a
Rear down
Rear up
Rear vertical motor
Rear- ward
S330
Tan

Driver"s Lumbar Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Driver"s Lumbar Wiring Diagram for Buick LaCrosse CX 2005:

D10 c2
Driver seat lumbar motor
Driver seat lumbar switch
G301 (inside left door sill, forward of left front seat)
Hot at all times
I/p fuse block (behind right side of dash)
Out
Pnk
Pwr seat circuit breaker 25a
S330
S331

Heated Seats Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Heated Seats Wiring Diagram for Buick LaCrosse CX 2005:

Body control module (behind left side of dash, left of steering column)
C2 f9
Class 2 serial data
Data link connector (under left side of dash)
Driver heated seat back element
Driver heated seat cushion element
Driver heated seat high indicator
Driver heated seat low indicator
Driver heated seat relay (under front of driver's seat)
Driver heated seat switch
Element
Front passenger heated seat back element
Front passenger heated seat cushion element
Front passenger heated seat high indicator
Front passenger heated seat low indicator
Front passenger heated seat relay (under passenger's seat)
Front passenger heated seat switch
G301 (inside left door sill, forward of left front seat)
Heated
Heated seat element
Heated seat thermistor
Hot at all times
Htd seat fuse 20a
Hvac control module
I/p fuse block (behind right side of dash)
Inflatable restraint front passenger presence system module (under front passenger's seat)
Logic
Low reference
Nca
Pnk
Rly ctrl
S330
S333
S379
Seat
Sensor sig
Sp205 (right side of dash)
Tan
Thermistor

Passenger"s Power Seat Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Passenger"s Power Seat Wiring Diagram for Buick LaCrosse CX 2005:

D10 c2
Forward
Front down
Front up
Front vertical motor
G301 (inside left door sill, forward of left front seat)
Horizontal motor
Hot at all times
I/p fuse block (behind right side of dash)
Nca
Passenger seat adjuster motor assembly
Passenger seat adjuster switch
Pwr seat circuit breaker 25a
Rear down
Rear up
Rear vertical motor
Rear- ward
S333
Tan

POWER TOP/SUNROOF

Power Top/Sunroof Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Power Top/Sunroof Wiring Diagram for Buick LaCrosse CX 2005:

Accessory voltage
Close
G302 (right door sill, forward of right front seat)
Ground
Hot w/ rap relay energized
I/p fuse block (behind right side of dash)
Open
S394
S395
Sun roof switch close signal
Sun roof switch low reference
Sun roof switch open signal
Sunroof fuse 20a
Sunroof motor (front center of sun roof module)
Sunroof switch
To mirrors system

POWER WINDOWS

Power Windows Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Power Windows Wiring Diagram for Buick LaCrosse CX 2005:

(body wiring harness, on floor, near center of vehicle, 20 cm from c325) s350
(inside left door sill, forward of left front seat) g301
C1 e
C1 f
Down
Driver window motor (in driver's door)
Driver window switch
Express down
Express down module
Front passenger window motor (in front passenger's door)
Front passenger window switch
G302 (right door sill, forward of right front seat)
Hot with rap relay energized
I/p fuse block (behind right side of dash, in glove box opening)
Illum
Illumination
Interior lights system
Left rear window motor (in left rear passenger door)
Left rear window switch
Lock out switch
Pwr wnd circuit breaker 25a
Right rear window motor (in right rear passenger door)
Right rear window switch
S501
S605
Tan

RADIO

Radio Wiring Diagram, with Amplifier for Buick LaCrosse CX 2005

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List of elements for Radio Wiring Diagram, with Amplifier for Buick LaCrosse CX 2005:

(behind left side of dash) i/p fuse block
1-6
A10
A11
A12
Amplifier ctrl
Antenna sig
Audio amplifier
Audio common
Audio common sig
B10
B11
B12
Band
Bare
Battery
C10
C11
C12
C275
C277
Center speaker
Class 2 serial data
Coax
Computer data lines system
Ctrl sig
Down
Drain wire
F center out (+)
F center out (-)
G200 (right side upper left footwell)
G202 (left side of dash)
Ground
Ground distribution system
Hot at all times
I/p fuse block (behind left side of dash)
I/p fuse block (behind right side of dash)
I/p lmp vlt
Inflatable restraint steering wheel module coil (in steering wheel assembly)
Interior lights system
L audio sig
L audio sig (+)
Left front door speaker
Left front tweeter speaker
Left rear speaker
Left steering
Lf low level sig (+)
Lf low level sig (-)
Lf spkr out (+)
Lf spkr out (-)
Lf tweeter out (+)
Lf tweeter out (-)
Lr low level sig (+)
Lr low level sig (-)
Lr spkr out (+)
Lr spkr out (-)
Mid range
Mute
Nca
On sig
Play
Pnk
R audio sig (+)
Radio
Radio antenna module (center rear of roof)
Radio on sig
Radio rear window antenna (center rear of roof)
Rdo/ amp fuse 25a
Rear sub out (+)
Rear sub out (-)
Rf low level sig (+)
Rf low level sig (-)
Rf spkr out (+)
Rf spkr out (-)
Rf tweeter out (+)
Rf tweeter out (-)
Right front door speaker
Right front tweeter speaker
Right rear speaker
Right steering
Rr low level sig (+)
Rr low level sig (-)
Rr spkr out (+)
Rr spkr out (-)
S213
S360 (behind right taillight)
S361
Satellite radio circuit
Seek
Seek down
Sub- woofer
Tan
Vehicle communication interface module (vcim) (if equipped) (behind center of dash)
Vol
Wheel controls

Radio Wiring Diagram, without Amplifier for Buick LaCrosse CX 2005

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List of elements for Radio Wiring Diagram, without Amplifier for Buick LaCrosse CX 2005:

(center rear of roof) radio antenna module
1-6
A10
A11
A12
A4 c1
A9 c2
Antenna sig
Audio common
Audio common sig
B10
B11
B12
Band
Bare
Battery
C10
C11
C12
C275
C277
Class 2 serial data
Coax
Computer data lines system
Ctrl sig
Drain wire
G pnk
G202 (left side of dash)
Ground
Hot at all times
I/p fuse block (behind left side of dash)
I/p fuse block (behind right side of dash)
Inflatable restraint steering wheel module coil (in steering wheel assembly)
L audio sig (+)
Left front door speaker
Left front tweeter speaker
Left rear speaker
Left steering wheel controls
Lf speaker output (+)
Lf speaker output (-)
Lr speaker output (+)
Lr speaker output (-)
Mute
Nca
On sig
Play
R audio sig (+)
Radio
Radio on sig
Radio/ amp fuse 25a
Rear window antenna radio (center rear of roof)
Rf speaker output (+)
Rf speaker output (-)
Right front door speaker
Right front tweeter speaker
Right rear speaker
Right steering wheel controls
Rr speaker output (+)
Rr speaker output (-)
Satellite radio circuit
Seek down
Seek up
Tan
Vehicle communication interface module (vcim) (if equipped) (behind center of dash)
Vol down
Vol up

Satellite Radio Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Satellite Radio Wiring Diagram for Buick LaCrosse CX 2005:

(left side of dash) g202
Antenna sig
Aud common
Audio common
Bare
Battery
Coax
Computer data lines system
Digital radio antenna (center rear of roof)
Digital radio receiver (left side of trunk)
Drain wire
Ground
Hot at all times
I/p fuse block (behind right side of dash)
I/p fuse block (behind right side of dash) c1
L aud sig (+)
L audio sig (+)
Nca
R aud sig (+)
R audio sig (+)
Radio
Rfa/mod fuse 10a
S400
Serial data

SHIFT INTERLOCK

3.6L VIN 7

3.6L VIN 7, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2005:

(behind left side of dash, left of steering column) body control module
(mounted to bank 1 cylinder head above exhaust manifold) g115
(under left side of dash) brake pedal position sensor
5 volt ref
A/t shift lock control solenoid (center of console assembly)
Automatic transmission
Battery positive voltage
C100
Class 2 serial data
Computer data lines system
E5 c1
Engine control module (top center of engine)
G301 (forward of left front seat)
Hot at all times
I/p fuse block (behind right side of dash)
Low ref
Module (inside air cleaner left front of engine)
P/n
Park/neutral signal
S101
Stop lamp sw sig
Switch sig a
Switch sig b
Switch sig c
Switch sig p
Trans internal mode switch (ims)
Transmission control
Turn/ haz fuse 20a

3.8L VIN 2

3.8L VIN 2, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2005:

(behind left side of dash, left of steering column) body control module
(left side of engine compt, in air cleaner assembly)
(lower left front of engine, on transmission stud, near starter) g113
(not used) w
(under left side of dash) brake pedal position sensor
5 volt ref
A/t shift lock control solenoid (center of console assembly)
Automatic transmission
Battery positive voltage
Class 2 serial data
Class 2 serial data c1
Column shift console shift
Computer data lines system
E5 c1
G202 (at base of steering column)
G301 (forward of left front seat)
Hot at all times
I/p fuse block (behind right side of dash)
Low ref
P/n
Powertrain control module
S101
Stop lamp sw sig
Switch sig a
Switch sig b
Switch sig c
Switch sig p
Trans internal mode switch (ims)
Turn/ haz fuse 20a

STARTING/CHARGING

Charging Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Charging Wiring Diagram for Buick LaCrosse CX 2005:

(i/p harn, left side of dash, approximately 21 cm from lamp assembly switch, toward eng compt pass-tru)
(not used) a
3.6l
3.8l
Batt +
Battery
Body control module (bcm) (behind left side of dash, left of steering column)
Charge indicator
Charging system
Clstr fuse 10a
Computer data lines system
Current sensor low ref
Current sensor sig
Ecm class 2 serial data
Engine control module (ecm) or (on top of eng)
G102 (3.6l: below right front strut tower, 3.8l: near battery)
G111 (3.6l: lower left front of eng, 3.8l: lower left side of eng)
G202 (left side of dash, base of steering column)
Generator
Generator field duty cycle sig
Generator turn on sig
Gnd
Ground
Hot at all times
I/p class 2 serial data
I/p dimming voltage ref
I/p fuse block (behind right side of dash)
Instrument panel cluster (ipc)
Interior lights system
Logic
Pcm class 2 serial data
Pcm/ecm class 2 serial data
Power distribution system
Powertrain control module (ecm) or (left front side of eng compt, in air cleaner assembly)
Red
S204
S211
Splice pack sp205 (right side of dash)
Starter

Starting Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Starting Wiring Diagram for Buick LaCrosse CX 2005:

-remote starter disabled
12-volt ref
3.6l
3.8l
Acc
Battery
Body control module (bcm) (behind left side of dash, left of steering column)
C11
C12
Charging circuit
Class 2 serial data
Clstr fuse 10a
Crank voltage
Crnk relay
G101 (left side of front end upper tie bar)
G102 (3.6l: below right front strut tower, 3.8l: near battery)
G111 (3.6l: lower left front of eng, 3.8l: lower left side of eng)
Ground distribution system
Hold- in coil
Hood ajar switch (front of eng compt)
Hood ajar switch sig
Hot at all times
Hot w/ ign 1 relay energized
I/p fuse block (behind right side of dash)
Ign 1 volt
Ignition 1 voltage
Ignition switch
Instrument panel cluster
Logic
Off
Ohms
Pcm fuse 15 10a
Pnk
Power distribution system
Powertrain control module or engine control module (3.6l: on top of eng, 3.8l: left front side of eng compt, in air cleaner assembly)
Pull- in coil
Red
S112
S200 (in steering column, near ignition switch)
Sp205 (right side of dash)
Start
Start enable rly ctrl
Starter
Starter fuse 33 40a
Underhood fuse block (mounted to right strut tower)

SUPPLEMENTAL RESTRAINTS

Supplemental Restraints Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005

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List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005:

(behind right side of dash) inflatable restraint instrument panel (i/p) module
(in right door sill, forward of right front seat)
(in steering wheel assembly) inflatable restraint steering wheel module
A10
A11
A12
A13
A14
A15
A16
A17
A18
C209
C211
C250
Case ground
G302
Ground
I/p stage 1 high
I/p stage 1 low
I/p stage 2 high
I/p stage 2 low
Ignition 1
Inflatable restraint sensing & diagnostic module (sdm) (under right front seat)
Inflatable restraint steering wheel module coil
L front end sens sig
L pretensioner high
L pretensioner low
L seat belt sw
L side impact sig
Left inflatable restraint front end sensor (left front of engine compt)
Left inflatable restraint roof rail module (left side roof line)
Left inflatable restraint side impact sensor (in left front door)
Lf roof rail mod high
Lf roof rail mod low
Low ref
Nca
Occupant data link
Pnk
R front end sens sig
R pretensioner high
R pretensioner low
R seat belt sw
R side impact sig
Red
Rf roof rail mod high
Rf roof rail mod low
Right inflatable restraint front end sensor (right front of engine compt)
Right inflatable restraint roof rail module (right side roof line)
Right inflatable restraint side impact sensor (in right front door)
Sdm serial data
Shorting bar
Shorting clip
Stage 1
Stage 2
Steer whl stage 1 high
Steer whl stage 1 low
Steer whl stage 2 high
Steer whl stage 2 low
Tan
W/ side impact -

Supplemental Restraints Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005

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List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005:

A11
Air bag ind
Airbag off
Airbag on
B10
B11
Batt main 1 fuse 26 40a
Battery b+
Case ground
Class 2 (sdm)
Class 2 serial data
Data link connector (under left side of dash)
Driver seat belt switch (in belt buckle)
G202 (base of steering column)
G301 (inside left door sill, forward of left front seat)
G302 (in right door sill, forward of right front seat)
Ground
Heated seat sig
Hot at all times
Hot in run & start
Humidity sensor
I/p fuse block (behind right side of dash)
Ignition 1
Inflatable restraint front passenger presence system (pps) module (under right front seat)
Inflatable restraint front passenger presence system (pps) sensor (under right front seat)
Inflatable restraint passenger air bag on/off indicator
Instrument panel cluster (ipc)
Left front seat belt pretensioner
Mass & position
Occupant data link
Pass airbag off ind
Pass airbag on ind
Passenger seat belt indicator
Passenger seat belt switch (in belt buckle)
Pnk
Red
Rfa/mod fuse 10a
Right front seat belt pretensioner
S300
S330
S333
Seat belt ind
Seatbelt ind
Seats system
Shorting bar
Sir fuse 9 10a
Splice pack sp205 (right side of dash)
Temp sensor
Underhood fuse block (mounted to right strut tower)

TRANSMISSION

3.6L VIN 7

3.6L VIN 7, Transmission Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.6L VIN 7, Transmission Wiring Diagram for Buick LaCrosse CX 2005:

(left of steering column) body control module
1-2 shift sol
1-2 sol vlv ctrl
10v ref
2-3 shift sol
2-3 sol vlv ctrl
Battery
Brake pedal position sensor (under left side of dash)
Data link connector (under left side of dash)
Engine control module (top of engine)
G115 (mounted to bank 1 cylinder head)
Gmlan serial data
Ground
Hot at all times
Hot in run or start
Ign 1
Ign 3 voltage
Iss high sig
Iss low sig
Low ref
P/n
P/n signal
Pc sol vlv ctrl
Pc sol vlv hi ctrl
Pnk
Pressure control solenoid
Red
S201
S202
Stop lp sw
Stop lp sw sig
Sw sig
Tan b
Tcc pwm sol ctrl
Tcc rel sw sig
Tcc sol valve
Tcm fuse 8 15a
Tft sens sig
Trans range a
Trans range b
Trans range c
Trans range p
Trans sol fuse 21 10a
Transmission
Transmission control module (tcm) (left front of engine compt)
Transmission fluid temperature sensor
Transmission input shaft speed sensor
Transmission internal mode switch
Trs sig a
Trs sig b
Trs sig c
Trs sig p
Underhood fuse block (mounted to right strut c1 tower)
Vehicle speed sensor (on transmission output shaft)
Vss hi sig
Vss low sig

3.8L VIN 2

3.8L VIN 2, A/T Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for 3.8L VIN 2, A/T Wiring Diagram for Buick LaCrosse CX 2005:

(vin 2: top right of intake manifold) (vin 4: top left rear of engine) engine coolant temperature sensor
1-2 shift solenoid
2-3 shift solenoid
5 volt ref
Acc
At iss sig
Automatic transaxle
Battery
Ect sensor sig
Fluid temp sensor
G113 (on transaxle stud, near starter)
Ground
Hot at all times
Hot in run or start
Ignition 1
Ignition 3
Ignition switch
Input shaft speed sensor
Lock
Low ref
Map sensor sig
Oss sig
Pc sol
Pcm fuse 15 10a
Pcm/ etc fuse 16 15a
Pnk
Powertrain control module (left front side of engine compt, in air cleaner assembly)
Pressure control solenoid
Red
Run
S101
Shift sol a
Shift sol b
Start
Tan
Tcc release switch
Tcc sol
Tcc sw sig
Tft sensor sig
Throttle position sensor (on throttle body assembly)
Torque converter clutch solenoid
Tr sw a
Tr sw b
Tr sw c
Tr sw p
Trans sol fuse 21 10a
Transmission internal mode switch
Underhood fuse block (mounted to right strut tower)
Vehicle speed sensor (lower right side of engine compt, on transaxle)

TRUNK, TAILGATE, FUEL DOOR

Trunk, Tailgate, Fuel Door Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Trunk, Tailgate, Fuel Door Wiring Diagram for Buick LaCrosse CX 2005:

Battery
Body control module (behind left side of dash, left of steering column)
Class 2 serial data
Door locks system
Driver information center (dic)
Drv dr lk sw unlock sig
E5 c1
Enable signal
G200 (behind left i/p knee bolster next to g202, at base of steering column)
G302 (right door sill, forward of right front seat)
Ground
Hot at all times
I/p fuse block (behind right side of dash, in glove box opening)
Lid ajar switch
Logic
Message center
Pas dr lk sw unlk sig
Rear compartment lid latch (in rear compt lid)
Remote control door lock receiver (rcdlr) (behind right side of dash)
S416
Sp205 (right side of upper left footwell)
Trip computer class 2 serial data
Trunk open
Trunk release control c2
Turn/haz fuse 20a

WARNING SYSTEMS

Warning Systems Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005

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List of elements for Warning Systems Wiring Diagram (1 of 2) for Buick LaCrosse CX 2005:

(inside left door sill, forward of left front seat) g301
Ajar
Auto
Battery
Body control module (bcm) (behind left side of dash, left of steering column)
Chmsl/ bkup fuse 15a
Door lock ajar indicator switch
Dr lck/ trunk fuse 15a
Driver door lock
Ext lmps off input
G102 (3.6l) (below right front strut tower)
G102 (3.8l) (near battery)
G111 (3.6l) (lower left front of engine, on transmission stud, near starter
G111 (3.8l) (lower left side of engine)
G200 (center of dash cross beam, behind radio
G201 (below dash, bolted to dash carrier)
G202 (left side of dash, at base of steering column)
G301 (inside left door sill, forward of left front seat)
Ground
Hazrd fuse 20a
Head
Hot at all times
I/p fuse block (behind right side of dash)
Ignition switch
Int light fuse 10a
Key in ignition switch
Key in sig
Left rear door lock
Lf ajar sw sig
Lr ajar sw sig
Multifunction turn signal lever
Off
Park
Park brake sw
Park brake switch (on park brake assembly)
Rf ajar sw sig
Rr ajar sw sig
S211
S214
S303
S500
Serial data
Underhood fuse block (mounted to right strut tower)
Washer/ rvc fuse 15a

Warning Systems Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005

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List of elements for Warning Systems Wiring Diagram (2 of 2) for Buick LaCrosse CX 2005:

A11
A14
A16
Ajar
Door lock ajar indicator switch
Driver seat belt switch
Fasten belts indicator
Front passenger door lock
G301 (inside left door sill, forward of left front seat)
G302 (in right door sill, forward of right front seat)
I/p fuse block (behind left side of dash)
Inflatable restraint sensing & diagnostic module (sdm) (under right front seat)
Instrument panel cluster (ipc)
Ipc class 2 serial data
Left seat belt sw
Logic
Nca
Passenger seat belt switch
Radio
Red
Right rear door lock
Right seat belt sw
S406
S604
Sdm class 2 serial data
Sp205 (right side of dash)

WIPER/WASHER

Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2005

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List of elements for Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2005:

A14
A15
B14
Battery
Body control module (behind left side of dash, left of steering column)
C14
C15
C2 f4
Class 2 serial data
D5 c3
Delay switch
E14
E15
F10
F11
F12
F14
G100 (in back of right headlamp on frame)
G14
G15
G200 (center of dash cross beam, behind radio)
Ground
High
Hot at all times
Instrument panel cluster
Int
Logic
Low
Low wash indicator
Low washer fluid
Low washer fluid ind sig
Message center
Mist
Off
Park out
Park sw sig
Pnk
Red
S124
Sp205 (right side of dash)
Tan
Turn signal/ multifunction switch
Underhood fuse block (mounted to right strut tower)
Washer pump ctrl
Washer switch
Washer/ rvc fuse 15a
Windshield washer fluid level switch (right front corner of engine compt, in washer fluid reservoir)
Windshield washer fluid pump (right front corner of engine compt, in washer fluid reservoir)
Windshield washer sw sig c3
Windshield wiper motor (on left side of firewall)
Windshield wiper sw high sig
Windshield wiper sw low sig
Wiper hi relay
Wiper high speed rly ctrl
Wiper relay
Wiper rly ctrl
Wiper switch
Wiper/ ws fuse 25a