GM Service Manual Online
For 1990-2009 cars only

Vehicle Preparation Procedure

Fog lamp aim should be checked:

    • When a new fog lamp capsule is installed
    • If service or repairs to the front end area have (or may have) disturbed the fog lamps or their mounting

Prior to aiming the fog lamps, the following steps must be taken:

  1. Remove any snow, ice or mud from the vehicle.
  2. The vehicle must have a full tank of gas.
  3. Stop all other work on the vehicle.
  4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
  5. The vehicle must be on a level surface.

  6. Object Number: 418380  Size: SH
  7. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
  8. The vehicle must contain one person or 72.56 kg (160 lb) on the driver's seat.
  9. Inflate the tires to the proper pressure.
  10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
  11. Rock the vehicle in order to stabilize the suspension.

The fog lamp horizontal aim is not adjustable on this vehicle. An adjusting screw located at the bottom of the fog lamp is available to adjust the vertical aim. Perform the following steps to adjust the vertical fog lamp aim:

Fog Lamp Aiming

  1. Park the vehicle on a level surface 1.5 m (5 ft) away from the target screen.
  2. Measure the center of the fog lamp to the ground line.
  3. Turn ON the fog lamps.
  4. Cover the headlamps while aiming the fog lamps.

  5. Object Number: 64604  Size: SH
  6. Ensure the top of the fog lamp beam is on the target screen 102 mm (4 in) below the horizontal center of the fog lamp lens height lines (2,3).
  7. Use the adjusting screw located at the bottom of the fog lamp to adjust the fog lamp as necessary.
  8. Turn OFF the fog lamp.