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 INSTRUCTIONSFOG LAMP AIMING PROCEDUREAIMING PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Aiming Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Aiming 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: Identifying Aiming Distances

Courtesy of GENERAL MOTORS CORP.

Park the vehicle on a level surface 7.6 m (25 ft) away from a wall or other flat surface.
Measure the distance from the floor to the center of the fog lamp (5).
Using this measurement, mark the horizontal centerline of the fog lamp (1) on the flat surface directly in front of the vehicle.
Turn ON the fog lamps.

Fig 2: Fog Lamp Vertical Adjustment Screw

Courtesy of GENERAL MOTORS CORP.

Reach under the rear lower edge of the front fascia in order to access the fog lamp vertical adjustment screw on the rear of the fog lamp.
Adjust the fog lamp so that the top edge of the fog lamp beam pattern is 100 mm (4 in) below the horizontal centerline.
Turn OFF the fog lamps.

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.