Wiring Chart for R/S on a 2004 Trailblaze

NOTES: Must go inside of the front Driver's door, the front Passenger door and the Rear Hatch to wire (3) separate Type C systems to the lock motors in each door. The wires are GRAY for lock and TAN for unlock. This will lock and unlock the two front doors and the rear hatch only. The middle doors, must be wired as a Type B system using the LT. BLUE for lock and the WHITE for unlock. The wires are located under the rear seat on the driver's side. 

NOTE ***       On the 4.2L engine the PCM (Power Control Module) is located on the DRIVERS SIDE of the engine, the TACH wire is in a BLUE plug Pin 49.   On the 5.3L engine, the PCM is located on the DRIVERS SIDE of the engine but down low on the front, the TACH wire is in a GREEN plug, Pin 10.

NOTE ****    The BCM (Body Control Module) is located under the LEFT REAR SEAT, attached to the FUSE BOX.