GM Service Manual Online
For 1990-2009 cars only

Fog Lamp Aiming GT

The front fog lamps must be aimed for proper illumination of the road. The front fog lamp aim should be checked when a new front fog lamp assembly is installed, or if service or repairs in the front end area may have disturbed the front fog lamp mounting.

Preparation Procedure

Important: Horizontal aim is not adjustable on this vehicle. Vertical aim is done by an adjusting screw located on the bottom of the fog lamp. Prior to aiming the fog lamps, perform the following steps:

  1. Completely assemble all of the components on the vehicle.
  2. Place the vehicle on a level surface.
  3. Stop all unnecessary operations or work that could affect the ride height of the vehicle.
  4. Close the doors and verify that the luggage compartment is empty.
  5. Stabilize the suspension by rocking the vehicle sideways.
  6. Ensure that the fuel level is full.
  7. Ensure that the tires are inflated to the proper pressure.
  8. Ensure that the driver or a similar weight, approximately 75 kg (165 lbs) is in the vehicle driver seat.

Aiming Procedure


    Object Number: 276650  Size: SH
  1. Park the vehicle 7.6 m (25 ft) away from the target screen.
  2. Measure from the center of the fog lamp to the ground line. Using this measurement, mark the horizontal centerline (2) of the fog lamp on the target screen directly in front of the vehicle.
  3. Turn ON the fog lamps. The top of the fog lamp beam image (4) on the target screen should be 102 mm (4 in) below the center of the fog lamp lens height.

  4. Object Number: 1228626  Size: SH
  5. Reach under the lower edge of the front fascia to access the fog lamp vertical adjustment screw (1).
  6. Adjust the fog lamp as required, using the adjusting screw (1) on the bottom of the fog lamp.
  7. Turn OFF the fog lamps.

Fog Lamp Aiming GXP

Adjustment Procedure

Proper road illumination and safety require the fog lamps to be aimed. The front fog lamp aim should be checked when a new front fog lamp assembly is installed, or if any service repairs have been performed to the vehicle which disturb the front fog lamp mounting or the vehicle ride height.

There are no horizontal adjustments for aiming the front fog lamp assemblies on this vehicle.


    Object Number: 365016  Size: SH
  1. To ensure accurate vertical front fog lamp aiming, first perform the following steps to prepare the vehicle.
  2. • Make sure that all the components are in place on the vehicle, the tires are properly inflated, and there is not any mud or snow clinging to the vehicle.
    • Stop all other operations of work on the vehicle.
    • Make sure the fuel level is 1/2 full or more.
    • Jounce the vehicle to settle the suspension.
    • Place the vehicle on a level surface 7.6 m (25 ft) from the target screen.
    • Measure the distance from the floor to the center of the fog lamp (5).
    • Using this measurement, mark the horizontal centerline of the fog lamp (1) on the target screen directly in front of the vehicle.
  3. Turn the front fog lamps ON.

  4. Object Number: 1628688  Size: SH
  5. Through the opening in the lower front grille above the fog lamp, access the fog lamp vertical adjuster screw (1).
  6. Adjust the fog lamp up or down until the top edge of the high intensity zone on the screen is 102 mm below the horizontal centerline.
  7. Turn OFF the front fog lamps.