GM Service Manual Online
For 1990-2009 cars only

Proper road illumination and safety require headlamp aiming. All states have requirements for headlamp aiming. Follow the state requirements. Aim the headlamps with the low beam lamps. The high beam lamps aim correctly if the low beam lamps are aimed properly.

    Important: If the vehicle regularly carries an unusual load in the rear compartment or if the vehicle regularly pulls a trailer, inspect the aim of the headlamps with these specific loads on the vehicle.

  1. Ensure that the vehicle is at the normal weight with fuel, oil, water and the spare tire.
  2. Ensure that the tires are uniformly inflated to the specified pressure, refer to the Tire Placard in General Information.

  3. Object Number: 365075  Size: SH
  4. Place the vehicle on a level surface so that the headlamps are 7.6 m (25 ft) from a wall or other flat surface (1).

  5. Object Number: 276644  Size: SH
  6. Locate the center line (1) on the aiming surface. The center line of the aiming surface is in-line with the center of the vehicle.
  7. 4.1. Mark the center of the front window with a narrow strip of masking tape.
    4.2. Mark the center of the rear window with a narrow strip of masking tape.
    4.3. Using the strips of masking tape, locate the center (1) of the aiming surface through the center line of the vehicle.
  8. Mark the horizontal center line of the headlamps (2) on the flat surface directly in front of the vehicle.
  9. Measure from the floor to the horizontal center line on the headlamp (2).
  10. Measure from the center of the vehicle to center of the headlamp.
  11. Using this measurement, mark the vertical center lines of the headlamps (5) on the aiming surface along the horizontal center line of the headlamps (3).
  12. Turn the headlamps on low beam.
  13. Observe the low beam lamp pattern (3) on the aiming surface. A correct pattern location is slightly below the horizontal center line (2) and slightly to the right of the vertical center lines (5).
  14. Remove the upper filler panels. Refer to Filler Panel Replacement - Upper in Body Front End.
  15. Turn the horizontal adjustment screw and the vertical adjustment screw in order to move the low beam lamp pattern to the correct pattern location as indicated in the graphic.
  16. Turn off the headlamps after completion.
  17. Install the upper filler panels. Refer to Filler Panel Replacement - Upper in Body Front End.