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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 921 (LIGHTING SYSTEMS)REPAIR INSTRUCTIONSHEADLAMP AIMINGHEADLAMP AIMING USING THE SCREEN METHODAIMING SCREEN
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Aiming Screen

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Aiming Screen
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

If in use, the screen should be at least 1.52 m (5 ft) in height by 3.66 m (12 ft) in width. The finish should be matte white. Keep the surface well shaded from extraneous light. Keep the screen in proper adjustment with the floor. The screen should be moveable in order to keep the screen in alignment parallel with the rear axle of the vehicle. Position the screen so that a horizontal line (3) drawn perpendicular to the centerline of the screen passes an equal distance midway between the headlamps.

Provide the screen with the following items:

  • A vertical centerline (4)
  • Two laterally adjustable vertical tapes (2)
  • One vertically adjustable horizontal tape (3)

If a regular, commercial aiming screen is not available, the screen may consist of a wall having a clear, uninterrupted area of at least 1.52 m (5 ft) height by 3.66 m (12 ft) width. The surface should be finished with a washable, no-gloss white paint. After establishing the aiming screen, paint or tape a reference line (6) on the floor 7.62 m (25 ft) from the screen. Park the vehicle with the front of the headlamps directly over this reference line.

Fig 1: Headlamp Aiming Using Screen Method
G01476323Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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

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  • • 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.