Vehicle Wiring Details for a
2005 Chevrolet Trailblazer
Item Wire Color Polarity Wire Location
12V red (40A), red/white (40A) Positive (+) ignition harness
Starter yellow Positive (+) ignition harness
Starter 2 N/A Positive (+) N/A
Ignition pink Positive (+) ignition harness
2nd Ignition white Positive (+) ignition harness
3rd Ignition N/A Positive (+) N/A
Accessory orange Positive (+) ignition harness
Accessory 2 brown Positive (+) ignition harness
Tachometer white Positive (+) cluster or PCM/ECM, blue plug / See notes (1)
Power Door (Lock)
Wiring Diagram for
[Positive (+)] Door Lock
GMDL1 module required Positive (+) N/A
Power Door (Unlock)
Wiring Diagram for
[Positive (+)] Door Unlock
see power lock Positive (+) see power lock
Door Trigger use dome supervision wire Negative (-) See notes (3)
Dome Supervision
Wiring Diagram for
[Positive (+)] Dome
gray/black Positive (+) fuse box under left rear seat
Headlights N/A Positive (+) N/A
Parklight Positive brown Positive (+) fuse box under left rear seat
Parklight Negative gray/black Negative (-) switch or BCM, tan plug, pin E5 / See note (2)
Wipers N/A Positive (+) N/A
Left Front Window
(Up/Down)
N/A Positive (+) N/A
Right Front Window
(Up/Down)
N/A Positive (+) N/A
Left Rear Window
(Up/Down)
N/A Positive (+) N/A
Right Rear Window
(Up/Down)
N/A Positive (+) N/A
Trunk/Hatch Pin use dome supervision wire Positive (+) See note (4)
Hood Pin pink/black (export only) Negative (-) switch or BCM, tan plug, pin E6 / See note (2)
Trunk/Hatch Release
Wiring Diagram for
[Positive (+)] Trunk/Hatch
N/A Positive (+) N/A
Factory Alarm
(Arm)
arms with GMDL1 Positive (+) arms with GMDL1
Factory Alarm
(Disarm)
disarms with GMDL1 Positive (+) disarms with GMDL1
Horn black/yellow to black Negative (-) See note (2)
Brake white Positive (+) brake pedal switch
Door Motor
(Lock)
gray 5 Wire driver door module in door
Door Motor
(Unlock)
tan 5 Wire driver door module in door
Disarm N/A Positive (+) N/A
Disarm No Unlock lt. green (if no GMDL1) Negative (-) driver door module in door
Additional Info:
(*) If using keyless entry, GMDL1 must be used, if using keyless entry AND remote start, GMDLBP is required. (1) 4.2L: The PCM is attached to the driver side of the engine. Tach is in pin 49; 5.3L: The ECM is near the lower front driver side of the engine. Tach is in pin 48. Can also go to any fuel injector and use the wire that is NOT pink. (2) The BCM is attached to the fuse box under the left rear seat. (3) To avoid dome light delay, use the separate door trigger wires. The LF door is gray/black (-) at the driver door module in the door. The RF door is black/white (-) at the passenger door module in the door. The LR door is lt. blue/black (-), and the RR door is lt. green/black (-). The rear door trigger wires are at the fuse box under the left rear seat. Use all four wires and diode isolate each. (4) To avoid dome light delay, use the separate trigger wires at the liftgate module in the liftgate. The liftgate is pink/black (-), and the glass hatch is purple (-). Use both wires and diode isolate each.

ATTENTION: This wiring information is being provided free of charge and on an "as is" basis, without any representation or warranty. It is your responsibility to verify any circuit before interfacing with it by using a digital multimeter. GNU Industries, Inc. assumes no responsibility with regards to the accuracy or currency of this information. Proper installation in every case is and remains the responsibility of the installer. GNU assumes no responsibility resulting from an improper installation, even in reliance upon this information.

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