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Headlamp Aiming Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. 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: Headlamp Bulb Centerlines
    GM1766304Courtesy of GENERAL MOTORS CORP.
  9. Measure from the reference line on the floor to the left headlamp bulb centerline (1).
  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 (3).
  12. At the screen, measure from the reference line and place the vertical tape at the measured distance.
  13. Turn the headlamps ON.
  14. Block the light from projecting onto the screen from the passenger side headlamp. This will allow the cutoff in the beam pattern from the drivers side to be more pronounced for easier aim verification.
    15. IMPORTANT:

    DO NOT cover the headlamp, this may cause excessive heat build up.

  15. On this vehicle you will be verifying the aim of the vertical cutoff on the left side of the lamp vertical bulb centerline as it is projected onto the aim board.
  16. If the location of the cutoff projected onto the board differs, an adjustment to the beam pattern location is necessary.
    17. Fig 2: Measuring Headlamp Horizontal Access
    GM1766311Courtesy of GENERAL MOTORS CORP.
  17. Adjust the vertical headlamp adjustment screw until the Left Gradient Line (Cutoff Line) is set -2.0 inches below the Horizontal Axis within +/- 2.0 inches (2) measured at 25 feet.
  18. Verify proper aim location.
  19. Repeat the aiming procedure for the passengers side headlamp while blocking the light from projecting onto the screen from the drivers side headlamp.
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