GM Service Manual Online
For 1990-2009 cars only

Object Number: 277181  Size: SH

The front fog lamps can be adjusted by turning the adjustment screw.

On the Xtreme, the adjustment screw is located above the center of the front fog lamp.

Use the following guidelines in order to adjust the aim:

    • Turn the adjustment screw clockwise in order to raise the aim.
    • Turn the screw counterclockwise in order to lower the aim.

On vehicles with the fog lamp built into the headlamp housing, no adjustment for just the fog lamp is available. Aiming is accomplished by aiming the headlamp assembly. Refer to Headlamp Aiming .

The front fog lamps may be adjusted using the screen method. Refer to Headlamp Aiming for information on preparing an aiming screen.

Use the following procedure in order to aim the fog lamps using the screen method:

  1. Position the vehicle on a level surface, squarely in front of the screen, so that the front surfaces of the fog lamps are 7.62 m (25 ft) from the aiming screen.
  2. Ensure that all vehicle components are properly installed, if other work has been performed on the vehicle.
  3. Ensure that the vehicle has 1/2 tank of fuel or less.
  4. Close all of the vehicle doors.
  5. Rock the vehicle to stabilize the suspension.
  6. Adjust the height of the horizontal tape line (3) on the aiming screen so that the distance between the line and the floor is 101.6 mm (4 in) LESS than the distance between the floor and the horizontal centerline (5) of the front fog lamps on the vehicle.
  7. Turn on the front fog lamps, and block the light from the headlamps, if necessary.
  8. Important: The top edges of the high intensity light zones must be at or below the level of the horizontal tape line (3).

  9. Observe the top edges of the high intensity light zones on the aiming screen.
  10. Using the adjustment screw, adjust the fog lamps so the top edges of the high intensity light zones are at or just below the level of the horizontal tape line (3) on the aiming screen.