GM Service Manual Online
For 1990-2009 cars only

The vehicle has a visual optical headlamp aiming system. The aim has been preset at the factory and should need no further adjustment.

However, if the vehicle is damaged in a crash, the headlamp aim may be affected and adjustment may be necessary.

If oncoming vehicles flash their high beams at you, this may also mean the vertical aim needs to be adjusted.

It is recommended that the vehicle is taken to your dealer/retailer for service if the headlamps need to be re-aimed. It is possible however, to re-aim the headlamps as described.

The vehicle should:

    • Be placed so the headlamps are 25 ft. (7.6 m) from a light colored wall.
    • Have all four tires on a level surface which is level all the way to the wall.
    • Be placed so it is perpendicular to the wall or other flat surface.
    • Not have any snow, ice, or mud on it.
    • Be fully assembled and all other work stopped while headlamp aiming is being performed.
    • Normally loaded with a full tank of fuel and one person or 160 lbs (75 kg) sitting on the driver seat.
    • Have all tires properly inflated.
    • Have the spare tire is in its original location in the vehicle.

Headlamp aiming is done with the vehicle's low-beam headlamps. The high-beam headlamps will be correctly aimed if the low-beam headlamps are aimed properly.

To adjust the vertical aim:

  1. Open the hood. See Hood Release for more information.

  2. Object Number: 1579716  Size: B2
  3. Find the aim dot on the lens of the low-beam headlamp.
  4. Measure the distance from the ground to the aim dot on the low-beam headlamp. Record the distance.

  5. Object Number: 1656201  Size: B2
  6. At the wall measure from the ground upward (A) to the recorded distance from Step 3 and mark it.
  7. Draw or tape a horizontal line (B) on the wall the width of the vehicle at the height of the mark in Step 4.
  8. Notice: Do not cover a headlamp to improve beam cut-off when aiming. Covering a headlamp may cause excessive heat build-up which may cause damage to the headlamp.

  9. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being adjusted. Do not place directly on the headlamp. This allows only the beam of light from the headlamp being adjusted to be seen on the flat surface.
  10. Driver Side Shown


    Object Number: 1579717  Size: B3
  11. Locate the vertical headlamp aiming screws, which are under the hood near each headlamp assembly.
  12. The adjustment screw can be turned with a 6 mm hex socket.

  13. Turn the vertical aiming screw until the headlamp beam is aimed to the horizontal tape line. Turn it clockwise or counterclockwise to raise or lower the angle of the beam.

  14. Object Number: 1656218  Size: B2
  15. The top edge of the cut-off should be positioned at the bottom edge of the horizontal tape line.
  16. Make sure that the light from the headlamp is positioned at the bottom edge of the horizontal tape line. The lamp on the left (A) shows the correct headlamp aim. The lamp on the right (B) shows the incorrect headlamp aim.
  17. Repeat Steps 7 through 9 for the opposite headlamp.