Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 665 (LIGHTING SYSTEMS)REPAIR INSTRUCTIONSLAMP CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Lamp Control Module

Courtesy of GENERAL MOTORS CORP.

Install the lamp module to the connector until fully seated.
Important: Do not tape past the line where the cooling fins begin. Taping around the fins will result in the module overheating.
Install a new electrical tape around the module in order to secure the module to the IP wire harness.
Connect all the electrical connectors.

Fig 2: Locating Retaining Clips
Courtesy of GENERAL MOTORS CORP.
Install the head lamp switch/4WD shift button housing to the IP so that the retainers are fully seated.
Install the IP trim bezel. Refer to BEZEL REPLACEMENT - IP CLUSTER .

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.