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Home >> Hummer >> 2004 >> H2 4D Utility Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 703 (Lighting Systems) >> Repair Instructions >> Headlamp Aiming >> Headlamp Aiming Procedure

Headlamp Aiming Procedure

WARNING: This page is about a different car, the 2003 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
  1. Align the left tires of the vehicle with the reference line extending from the screen with the headlamps aligned with the reference line.
  2. Remove any snow, ice or mud from the vehicle.
  3. The vehicle should be fully assembled and all other work stopped while the headlamp aiming is being done.
  4. The vehicle should contain cargo or be loaded to represent normal vehicle use.
  5. Tires should be properly inflated.
  6. Rock the vehicle to stabilize the suspension.
  7. Measure from the floor to the center of the lamp bulb on the vehicle. Some lamps have an aim dot marked on the lens.
  8. At the screen, measure from the floor and place the horizontal tape at the measured distance.
    9. Fig 1: Measuring Distance Between Headlamps Face & Aiming Screen
    GM418400Courtesy of GENERAL MOTORS CORP.
  9. Measure from the reference line on the floor to the left headlamp bulb centerline.
  10. At the screen, measure from the reference line and place the vertical tape at the measured distance.
  11. Measure from the reference line on the floor to the right headlamp bulb centerline.
  12. At the screen, measure from the reference line and place the vertical tape at the measured distance.
  13. Turn the headlamps ON.
  14. Adjust the headlamps to the specifications required by state and local authorities.
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