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BUICK LACROSSE
MODEL YEAR(S
LACROSSE 2005-2008
KEY T-HARNESS IMMOBILIZER
GMKEY-1 N/A GM'S TRANSPONDER ANTI-THEFT SYSTEM, See NOTE #1
PART COLOR LOCATION DIAGRAM
12 VOLT CONSTANT RED (+) @ BATTERY or FUSE BOX
STARTER YELLOW (+) IGNITION SWITCH HARNESS or BCM, C1, Pin 21 See NOTE #2
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS or BCM, C1, Pin 22 See NOTE *1
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 BROWN (+) IGNITION SWITCH HARNESS or BCM, C1 Pin 23 See NOTE #2
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) BROWN/WHITE (-) @ BCM, C3 Pin 8, See NOTE #2
PARKING LIGHTS ( + ) BROWN (+) @ FUSE BOX or PASSENGER KICK PANEL, Harness to REAR of VEHICLE.
POWER LOCK RED/BLACK (TYPE B) @ BCM, C2 Pin 2, See NOTE #2
POWER UNLOCK ORANGE/BLACK (TYPE B) @ BCM, C2 Pin 11, See NOTE #2
LOCK MOTOR WIRE GRAY (5-WIRE TYPE) @ BCM, C2, Pin 52, See NOTE #2
DOOR TRIGGER See NOTE #3 @ BCM, C2, See NOTE #2 14301_LACROSSE_(-) NEGATIVE DOOR PIN ISOLATION CIRCUIT.pdf
DOMELIGHT SUPERVISION GRAY/BLACK (-) @ BCM, C1 Pin 43, See NOTE #2
TRUNK RELEASE LIGHT BLUE (+) @ BCM, C2, Pin 45, See NOTE #2
SLIDING POWER DOOR N/A
HORN BLACK (-) @ BCM, C1 Pin 4, See NOTE #2
TACH ANY wire NOT PINK or WHITE (AC) @ ANY FUEL-INJECTOR
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ BCM, C2 Pin 30, See NOTE #2
FACTORY ALARM DISARM PURPLE (-) @ BCM, C2 Pin 24, See NOTE #2
ANTI-THEFT GM'S TRANSPONDER ANTI-THEFT SYSTEM, See NOTE #1 @ IGNITION SWITCH TUMBLER
NOTES
NOTE #1: This vehicle is equipped with GM's TRANSPONDER ANTI-THEFT System and will require

part #791 BYPASS MODULE and an extra ignition key for Remote Starter Operation.



To order go to the SECURITY BYPASS MODULE Page on this website.





NOTE #2: 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.





NOTE #3: the DRIVERS 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, See DAIGRAM
LINK 1 LINK TEXT 1 LINK 2 LINK TEXT 2