GM Service Manual Online
For 1990-2009 cars only

In order to prepare the vehicle for aiming the fog lamps, perform the following procedures:

  1. Completely assemble all of the components on the vehicle.
  2. Position the vehicle on a level surface.
  3. Stop all unnecessary operations or work on the vehicle that affects the vehicle trim.
  4. Close the doors.
  5. Stabilize the suspension.
  6. Ensure that the fuel level is at a 1/2 tank or less.
  7. Ensure that the tires are inflated to the proper pressure.

Vehicle Aim

Record the specification readings a distance of 7.6 m (25 ft) from the fog lamp lens in order to perform the fog lamp vertical aim. Ensure that the top of the fog lamp beam is 50-150 mm (2-6 in) below the fog lamp horizontal centerline.

Adjust the vertical aim by turning the vertical adjusting nut. The vertical adjusting nut is located on the rear of the fog lamp assembly.