Whether your an expert Buick Lacrosse car alarm installer, Buick Lacrosse performance fan or a novice Buick Lacrosse enthusiast with a 2008 Buick Lacrosse, a 2008 Buick Lacrosse car alarm wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car alarm, car security, car remote start, automatic remote starter, shock sensor, tilt sensor, car alarm sensor or any auto alarm is identifying the correct color car security wires for a 2008 Buick Lacrosse.

The Modified Life staff has taken all its Buick Lacrosse car alarm wiring diagrams, Buick Lacrosse car security wiring diagrams, Buick Lacrosse car alarm wire diagrams, Buick Lacrosse car security wiring schematics, Buick Lacrosse car security diagrams, Buick Lacrosse remote starter wiring diagrams and cataloged them online for our visitors to use for free. Our automotive wiring diagrams allow you to enjoy your new auto security electronics rather than spend countless hours trying to figure out which wires goes where.

Feel free to use any Buick Lacrosse auto alarm wiring diagram that is listed on Modified Life but keep in mind that all information here is provided as-is without any warranty of any kind and most of the auto security wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2008 Buick Lacrosse.

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2008 Buick Lacrosse Car Alarm Wiring Diagram

Battery Constant 12v+ Positive Wire (+): Red
Battery Constant 12v+ Positive Wire Location: At Battery or Fuse Box

Starter Positive Wire (+): Yellow
Starter Positive Wire Location: Ignition Switch Harness or at Pin #21 at C1 Connector at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Second Starter Positive Wire (+): N/A
Second Starter Positive Wire Location: N/A

Ignition Positive Wire (+): Pink
Ignition Positive Wire Location: Ignition Switch Harness or at Pin #22 at C1 Connector at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Second Ignition Positive Wire (+): N/A
Second Ignition Positive Wire Location: N/A

Third Ignition Positive Wire (+): N/A
Third Ignition Positive Wire Location: N/A

Accessory Positive Wire (+): Brown
Accessory Positive Wire Location: Ignition Switch Harness or at Pin #23 at C1 Connector at BCM Module. See Note *1

Second Accessory Positive Wire (+): N/A
Second Accessory Positive Wire Location: N/A

Key Sense Wire: N/A
Key Sense Wire Location: N/A

Parking Light Negative Wire (-): Brown/White
Parking Light Negative Wire Location: At Pin #8 in C3 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Parking Light Positive Wire (+): Brown
Parking Light Positive Wire Location: At Fuse Box or Passenger Kick Panel, Harness To Rear Of Vehicle.

Power Door Lock Negative Wire (-): Red/Black
Power Door Lock Negative Wire Location: At Pin #2 in C2 Plug at BCM Module.

Power Door Unlock Negative Wire (-): Orange/Black
Power Door Unlock Negative Wire Location: At Pin #11 in C2 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Door Trigger Negative Wire (-): The driver side door is a grey/black (-) pin 26, the passenger door is a black/white (-) pin 17, the drivers rear door is a blue/black (-) pin 7 and the passenger rear door is a light green/black (-) pin 5 when connecting to an alarm system use all 4 wires and diode isolate.
Door Trigger Negative Wire Location: At C2 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Dome Light Supervision Wire (-): Gray/Black
Dome Light Supervision Wire Location: At Pin #42 in C1 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Trunk Release Positive Wire (+): Light Blue
Trunk Release Positive Wire Location: At Pin #45 in C2 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Sliding Power Door Wire: N/A
Sliding Power Door Wire Location: N/A

Horn Negative Wire (-): Black (-)
Horn Negative Wire Location: At BCM, C1 Pin 4. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Tachometer Wire Negative Wire (-): Any Wire Not Pink or White
Tachometer Wire Negative Wire Location: At Any Fuel-Injector

Wait To Start Wire: N/A
Wait To Start Location: N/A

Brake Light Positive Wire (+): White
Brake Light Positive Wire Location: At Pin #30 in C2 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Factory Alarm Disarm Wire (-): Purple
Factory Alarm Disarm Wire Location: At Pin #24 in C2 Plug at BCM Module. The BCM is located to the left of the steering column, C1 is a black 52-pin plug, C2 is a black 52-pin plug, and C3 is a black 18-pin plug.

Factory Anti-Theft System: GM Passkey III (PK3 On Steel Shaft Of Ignition Key) Transponder System
Factory Anti-Theft System Location: Transponder At Ignition Switch Tumbler

The 2008 Buick Lacrosse alarm wire color information above is updated as it is submitted by the Modified Life community.

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