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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 655 (Lighting Systems) >> Repair Instructions >> Headlamp Aiming >> Headlamp Aiming Procedure

Headlamp Aiming Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Adjust the headlamps to the specifications required by state and local authorities.
  2. Align the left tires of the vehicle with the reference line extending from the screen with the headlamps aligned with the reference line.
  3. Remove any snow, ice or mud from the vehicle.
  4. The vehicle should be fully assembled and all other work stopped while the headlamp aiming is being done.
  5. The vehicle should be loaded to represent normal vehicle use.
  6. Tires should be properly inflated.
  7. Rock the vehicle to stabilize the suspension.
  8. Measure from the reference line on the floor to the left headlamp bulb centerline.
  9. At the screen, measure from the reference line and place the vertical tape at the measured distance.
    Fig 1: Aiming Headlamps
    G01802973Courtesy of GENERAL MOTORS CORP.
  10. Measure from the reference line on the floor to the right headlamp bulb centerline.
  11. At the screen, measure from the reference line and place the second vertical tape at the measured distance.
  12. Adjust the left and right headlamp horizontal aim to the vertical lines on the screen by turning the horizontal aiming screws.
  13. Measure from the floor to the aim dot marked on the left headlamp lens and subtract 51 mm (2 in).
  14. At the screen, measure from the floor and place the horizontal line at the previously calculated distance.
  15. Adjust the left headlamp to the horizontal line on the screen by turning the vertical aiming screw.
  16. Measure from the reference line on the floor to the aim dot marked on the right headlamp lens.
  17. At the screen, measure from the floor and place the horizontal line at the measured distance.
  18. Adjust the right headlamp to the horizontal line on the screen by turning the vertical aiming screw.
    Fig 2: Measuring Headlamp Horizontal Accuracy
    G01802974Courtesy of GENERAL MOTORS CORP.
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