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Vehicle Wiring Details for your
2003-2005 Chevrolet S-10 Blazer 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 2003-2005 Chevrolet S-10 Blazer . 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 (+)   @ IGNITION SWITCH HARNESS
 STARTER  YELLOW (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  PINK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  WHITE (+)  @ IGNITION SWITCH HARNESS
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  ORANGE (+)  @ IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  N/A  
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  WHITE (-)  @ BCM, LIGHT BLUE plug, See NOTE #2
 PARKING LIGHTS ( + )  BROWN (+)  @ BCM, LIGHT BLUE plug, See NOTE #2
 POWER LOCK  LIGHT BLUE (TYPE A)  @ BCM, BROWN plug, See NOTE #2
 POWER UNLOCK  WHITE (TYPE A)  @ BCM, BROWN plug, See NOTE #2
 DOOR TRIGGER  See NOTE #3  @ BMC, See NOTE #2
 DOMELIGHT SUPERVISION  See NOTE #3  @ BCM, See NOTE #2
 TRUNK RELEASE  BLACK (-)  @ BCM, PURPLE Plug
 SLIDING POWER DOOR  N/A  
 HORN  BLACK (-)  @ STEERING COLUMN HARNESS
 TACH  WHITE (AC)  @ PCM, See NOTE #4
 WAIT TO START LIGHT  N/A  
 BRAKE  WHITE (+)  @ STEERING COLUMN HARNESS
 FACTORY ALARM DISARM   LIGHT GREEN (-)  @ BCM, PURPLE plug, See NOTE #2
 ANTI-THEFT  YELLOW and ORANGE/BLACK  PASSLOCK 2 at STEERING COLUMN HARNESS
 EXTRA INFORMATION
 NOTE #1: Vehicle is EQUIPPED WITH GM'S PASSLOCK 2 ANTI-THEFT SYSTEM, REQUIRES 791 BYPASS MODULE to REMOTE START, to order please go to the SECURITY BYPASS MODULE Page on this website. NOTE #2: The BCM (Body Control Module) is located to the RIGHT of the GAS PEDAL, below the RADIO. The PLUGS on the BCM face the DRIVERS side of the vehicle. NOTE #3: The wires for the DOOR TRIGGERS and DOME LIGHT SUPERVISION are located at the BCM: The DRIVERS door wire is a TAN(-) B4 and the PASSENGER door is a ORANGE (-) B2 in the PURPLE Plug. For the REAR doors and REAR hatch use the DARK BLUE/WHITE B11 in the LIGHT BLUE Plug of the BCM. When connecting an ALARM SYSTEM use ALL 3 wires and DIODE ISOLATE. For DOME LIGHT SUPERVISION use only the TAN (-) B4 wire in the PURPLE Plug. NOTE #4: The PCM (Power Control Module) is located on the PASSENGER FENDER. On the 2.2L engine the TACH wire is in a BLACK 80-Pin plug, Pin 10 and on the 4.3L engine, the TACH wire is in a RED 32-Pin plug, Pin 20.
 
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