Fog Lamp Aiming

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

No horizontal adjustment for aiming the front fog lamp assemblies is provided on this vehicle.

1. Use the headlamp aiming screen for aiming the fog lamps. Refer to Headlamp Aiming .
2. To ensure accurate vertical front fog lamp aiming, first perform the following steps to prepare the vehicle:
   • Ensure that all the components are in place on the vehicle.
   • Ensure that the fuel tank is full.
   • Ensure that the tires are inflated to the proper pressure.
   • Place the vehicle on a level surface 7.6 m (25 ft) away from a target screen.
   • Stop all other operations of work on the vehicle.
   • Jounce the vehicle to settle the suspension.
   IMPORTANT: Do NOT cover the headlamps. This may cause excessive heat buildup.
   • Block the headlamps from projecting light onto the aiming screen while aiming the fog lamps.
3. Turn the front fog lamps ON.
Fig 1: Locating Alignment Points On Target Screen
Courtesy of GENERAL MOTORS CORP.
4. Measure the distance from the centerline of the vehicle (1) to the center of each fog lamp beam (3).

   These measurement should be the same. If necessary adjust the fog lamp mounting surface.

5. 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.
6. The fog lamp vertical adjustment screw is located on the front of the fog lamp.
7. Adjust the fog lamp up or down until the top of the fog lamp beam (4) on the target screen is 102 mm (4 in) below the horizontal centerline (2).
8. Turn OFF the front fog lamps.