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Vehicle Wiring Details for your
2009- Buick Lacrosse Wiring Diagram
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Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 2009- Buick Lacrosse . This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle. Please be sure to test all of your wires with a digital multimeter before making any connections. More information on using a multimeter and testing wires please see our Technical Support Area.


 PART   COLOR  LOCATION
 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
 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  
 EXTRA INFORMATION
 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 INTERFACE BYPASS MODULE PART # DB-ALL TO REMOTE START, TO ORDER GO TO THE INTERFACE BYPASS MODULE PAGE ON THIS WEBSITE.
 
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