GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Fog Lamps

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REMOVAL & INSTALLATION



See Figure 1

If removing or replacing the fog lamps (not just the bulb) and one or both of the fog lamps still operates, refer to the aiming procedure later in this section to ease checking or adjustment of the fog lamps after installation.

Most fog lamp bulbs are easily replaced by removing the lens cover (standard bulbs) or lens trim panels (halogen bulbs) for access. Most later model vehicles are equipped with Halogen bulbs which require extra care. Handling a Halogen bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury follow the precautions closely.

Whenever handling Halogen bulbs, ALWAYS follow these precautions:

  1. Turn the lamp switch OFF and allow the bulb to cool before changing it. Leave the switch OFF until the change is complete.
  2.  
  3. ALWAYS wear eye protection when changing a Halogen bulb.
  4.  
  5. DO NOT drop or scratch the bulb. Keep moisture away.
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  7. Place the used bulb in the new bulb's carton and dispose of it properly.
  8.  
  9. Disconnect the negative battery cable.
  10.  
  11. If replacing a standard bulb, remove the screws and lens for access to the bulb. Free the bulb from the socket and replace.
  12.  
  13. If replacing a Halogen bulb (all 1992 and later equipped vehicles, and some earlier models):
    1. Remove the lens trim panel screws from the front of the lamp, then pull the lamp and lens assembly forward from the case and turn it over.
    2.  
    3. Disengage the white wire connector inside the braided insulator (leave the ground wire connected). Note the position of the wire clip at the lamp and lens assembly, then squeeze the edges of the clip together and remove it.
    4.  
    5. Lift out the wire and the halogen bulb assembly.
    6.  

  14.  
  15. If the lamp assembly is being replaced:
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When replacing lamp assemblies, if possible mark the beams of one or both lamps on a wall as a reference. Please see the aiming procedure later in this section for details.

  1. Disengage the electrical wiring from the fog lamp.
  2.  
  3. Remove the lamp assembly retaining screws. On early applications, the lamp was usually fastened to the bumper and air deflector. Make sure all retaining screws are unthreaded, then remove the lamp assembly from the vehicle.To install:

    Click image to see an enlarged view

    Fig. Fig. 1: Common fog lamp mounting

  4.  

  1. If the lamp assembly was removed:
    1. Position the lamp assembly to the vehicle and secure using the retaining screws.
    2.  
    3. Engage the electrical wiring.
    4.  
    5. Check the fog lamp aiming and adjust, as necessary.
    6.  

  2.  
  3. If only the Halogen bulb is being replaced:
    1. Install the white wire connector to the wiring in the braided insulator.
    2.  
    3. Install the bulb into the back of the lamp and lens assembly.
    4.  
    5. Install the wire clip to hold the bulb in place. Make sure the clip is firmly in position and the bulb is not loose.
    6.  
    7. Install the lens and lamp assembly into the case, then secure the trim panels using the retaining screws.
    8.  

  4.  
  5. If only a standard bulb was replaced, install the bulb, then secure the lens cover to the housing.
  6.  
  7. Connect the negative battery cable and check for proper operation.
  8.  

AIMING



See Figure 2

The fog lights must be properly aimed to provide the best, safest road illumination. The lights should be checked for proper aim and adjusted as necessary. Certain state and local authorities have requirements for fog light aiming; these should be checked before adjustment is made.

Fog light adjustment may be temporarily made using a wall, as described below, or on the rear of another vehicle. When adjusted, the lights should not glare in oncoming car or truck windshields, nor should they illuminate the passenger compartment of vehicles driving in front of you. Fog lights should NOT be adjusted to match the beams of the headlights either. They are designed to illuminate the road in a different manner and because of their lower mounting, an attempt to match the headlight beams would likely result in blinding oncoming traffic. Improper adjustments may be both dangerous and illegal.



Click image to see an enlarged view

Fig. Fig. 2: Aiming zone for proper fog lamp adjustment

For most factory installed fog lamps, the beam may be adjusted upward and downward using the adjusting screw provided below the lens assembly. No horizontal adjustment is provided for factory installed lamps. On many aftermarket lamps however, aiming is achieved by physically adjusting the housing. Most aftermarket applications do not use adjustment screws; instead, the mounting bolts are loosened, the housing is repositioned slightly and the retainers are tightened again.

Before removing the fog lamp assembly or disturbing the lamp in any way, note the current settings in order to ease adjustment upon reassembly. This can be done using the wall of a garage or a building:

  1. Park the truck on a level surface, with the fuel tank about 1 / 2 full and with the vehicle empty of all extra cargo (unless normally carried). The vehicle should be facing a wall or screen which is 2 1 / 2 feet from the front of the truck.
  2.  

The truck's fuel tank should be about half-full when adjusting the fog lamps. Tires should be properly inflated, and if a heavy load is normally carried in the vehicle, it should remain there.

  1. If aiming is to be performed outdoors, it is advisable to wait until dusk in order to properly see the fog light beams on the wall. If done in a garage, darken the area around the wall as much as possible by closing shades or hanging cloth over the windows.
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  3. Turn the fog lamps ON and mark the wall at the center of each light's beam. A short length of masking tape which is visible from the front of the truck may be used.
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  5. If the beam on 1 side of the vehicle is not working, and if another like-sized truck is available, park the second truck in the exact spot where the S/T was and mark the beams using the same-side light on that truck. Then, switch the trucks so the S/T is back in the original spot. The truck must be parked no closer to or farther away from the wall than the second vehicle.
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  7. Perform any necessary repairs, but make sure the truck is not moved, or is returned to the exact spot from which the lights were marked. Turn the fog lights ON and adjust the beams to match the marks on the wall.
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  9. If no marks were made (beams were not working and another truck was not available) use the fog lamp aiming zone dimensions to achieve proper adjustment:
    1. With the truck parked as noted earlier (tank half-full and tires properly inflated, about 2 1 / 2 feet from a wall) turn the fog lamps ON .
    2.  
    3. Draw a horizontal line on the wall or screen at the same height as the centerline of the lamps.
    4.  
    5. The top edge of the height intensity zone should be 0.2-0.8 in. (5-20mm) below the centerline of the lamps.
    6.  

  10.  

 
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