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BUICK LACROSSE
MODEL YEAR(S
LACROSSE 2009
KEY T-HARNESS IMMOBILIZER
N/A N/A TRANSPONDER SYSTEM, See NOTE #4
PART COLOR LOCATION DIAGRAM
12 VOLT CONSTANT RED (+) @ Dash Fusebox, (BLACK 68 Pin Plug) Pin F3
STARTER YELLOW (+) @ IGNITION SWITCH or BCM, (BLACK 52 Pin Plug(X1) Pin 21, Note #1
STARTER 2 N/A
IGNITION 1 PINK (+) @ IGNITION SWITCH or BCM, (BLACK 52 Pin Plug(X1) Pin 22, Note #1
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 N/A
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) BROWN/WHITE (-) @ HEADLIGHT SWITCH or BCM, (BLACK 18 Pin Plug(X3) Pin 8, Note #1
PARKING LIGHTS ( + ) BROWN (+) @ Passenger Kick Panel, or Dash Fusebox, (BLACK 68 Pin Plug) Pin E2, Note #2
POWER LOCK RED/BLACK (TYPE B) @ Drivers Kick Panel or BCM, (BLACK 52 Pin Plug(X2) Pin 2, Note #1
POWER UNLOCK ORANGE/BLACK (TYPE B) @ Drivers Kick Panel or BCM, (BLACK 52 Pin Plug(X2) Pin 11, Note #1
LOCK MOTOR WIRE GRAY ( 5-Wire type) @ DRIVERS KICK PANEL or BCM, (BLACK 52 Pin Plug(X2) Pin 52, Note #1
DOOR TRIGGER GRAY/BLACK (Ajar) (-) or TAN (Open) (-) @ BCM, (BLACK 52 Pin Plug(X2) Pins 26 and 25, Note #1
DOMELIGHT SUPERVISION GRAY/BLACK (+) @ BCM, (BLACK 52 Pin Plug(X1) Pin 43, Note #1
TRUNK RELEASE USE TRUNK RELEASE MOTOR WIRE! Note #3
SLIDING POWER DOOR N/A
HORN DK. BLUE to TAN to BLACK (-) @ HORN SWITCH or BCM, (BLACK 52 Pin Plug(X1) Pin 4, Note #1
TACH Any wire NOT PINK (V-6) or PINK/BLACK (V-8) (AC) @ Any Fuel Injector
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ BRAKE SWITCH
FACTORY ALARM DISARM PURPLE (-) @ DRIVERS KICK PANEL or BCM, (BLACK 52 Pin Plug(X2) Pin 24, Note #1
ANTI-THEFT GM'S MULTIPLEX IGNITION/TRANSPONDER SYSTEM, See NOTE #4
NOTES
Note #1: The BCM (Body Control Module) is located under the Drivers Dash and to the Left of

the Steering Column.





Note #2: The DASH FUSEBOX is located behind the Passenger end of the Dash.





Note #3: An Extended Pulse on the Power Unlock wire will also Release the Trunk.





NOTE #4 REQUIRES PART # 791 BYPASS and a KEY THAT STARTS THE CAR TO LEAVE INSIDE THE BYPASS, TO ORDER CALL 800 561 1110 ex. 2146, 9AM to 5PM eastern time, M-F.
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