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 1630 (LIGHTING SYSTEMS)REPAIR INSTRUCTIONSDAYTIME RUNNING LAMPS (DRL) AMBIENT LIGHT SENSOR REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Install the daytime running lamp (DRL) ambient light sensor (1) to the DRL ambient light sensor connector.
Position the DRL ambient light sensor to the opening in the instrument panel (IP) upper trim panel. Twist the DRL ambient light sensor 1/4 turn clockwise.
Verify that the DRL ambient light sensor wiring harness will not be pinched when the IP upper trim panel is installed. Working from left to right, press down on the IP upper trim panel in order to engage the retainers to the IP upper trim pad.

Fig 1: Installing Daytime Running Lamp Ambient Light Sensor
Courtesy of GENERAL MOTORS CORP.
Install the garnish molding to the right windshield pillar. Refer to GARNISH MOLDING REPLACEMENT - WINDSHIELD PILLAR in Interior Trim.

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.