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 1294 (LIGHTING SYSTEMS)REPAIR INSTRUCTIONSHEADLAMP AIMINGVISUAL AIMING PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Visual Aiming Procedure
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Visual Aiming Procedure
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- All equipment for testing headlamps must comply with the SAE Recommended Practice for Headlamp Inspection Equipment.
- If you use a headlamp testing machine, the machine should give results equivalent to the results obtained using the screen procedure.
- The machine should be in good condition and be properly adjusted.
- Use the machine in accordance with the manufacturer's instructions.
- Machines that use a photoelectric cell or cells to determine aim, should also include a visual screen on which you can project a beam pattern proportional to the beam appearance, and aim on a screen at 7.62 m (25 ft).
- The screen should be plainly visible to the technician who is adjusting the headlamps.
- The screen should have horizontal and vertical reference lines in order to permit visual evaluation of the headlamp beam.
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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.