GM Bonneville/Eighty Eight/LeSabre 1986-1999

Headlights

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4


CAUTION
Halogen bulbs contain gas under pressure. Handling the bulbs incorrectly could cause it to shatter into flying glass fragments. Do NOT leave the light switch ON. Always allow the bulb to cool before removal. Handle the bulb only by the base; avoid touching the glass itself.

  1. Open the vehicle's hood and secure it in an upright position.
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  3. Remove headlight assembly or headlight assembly covers, as necessary for access to the bulbs at the rear of the headlight assembly.
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  5. If assembly is removed from car, place on towel to protect the lens surface. If you can reach the back of the bulb assembly you don't need to remove the lens assembly. Some headlamp bulbs use a lockring. If your car has a lockring around the bulb, unfasten the locking ring which secures the bulb and socket assembly, then withdraw the assembly rearward.
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  7. Grasp the connector assembly, turn to align tabs and remove the bulb assembly.
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Fig. Fig. 1: You must turn the bulb assembly to align the tabs, then pull the bulb and connector rearward



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Fig. Fig. 2: Pull the bulb and connector assembly rearward, holding it by the base, NOT by the glass

  1. Remove the wire connector from the light bulb and turn the bulb out of the headlight assembly.
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Fig. Fig. 3: Holding the bulb by its base, unplug it from the electrical connector



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Fig. Fig. 4: Exploded view of a common headlight bulb replacement

To install:
  1. Before installing a light bulb into the socket, ensure that all electrical contact surfaces are free of corrosion or dirt.
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  3. Line up the replacement headlight bulb with the socket. Firmly push the bulb onto the socket until the spring clip latches over the bulb's projection.
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WARNING
Do not touch the glass bulb with your fingers. Oil from your fingers can severely shorten the life of the bulb. If necessary, wipe off any dirt or oil from the bulb with rubbing alcohol before completing installation.

  1. To ensure that the replacement bulb functions properly, activate the applicable switch to illuminate the bulb which was just replaced. (If this is a combination low and high beam bulb, be sure to check both intensities.) If the replacement light bulb does not illuminate, either it too is faulty or there is a problem in the bulb circuit or switch. Correct if necessary.
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AIMING THE HEADLIGHTS



See Figures 5 through 9

The headlights 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 headlight aiming; these should be checked before adjustment is made.


CAUTION
About once a year, when the headlights are replaced or any time front end work is performed on your vehicle, the headlight should be accurately aimed by a reputable repair shop using the proper equipment. Headlights not properly aimed can make it virtually impossible to see and may blind other drivers on the road, possibly causing an accident. Note that the following procedure is a temporary fix, until you can take your vehicle to a repair shop for a proper adjustment.

Headlight 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. These adjustments are rough and should always be fine-tuned by a repair shop which is equipped with headlight aiming tools. Improper adjustments may be both dangerous and illegal.

For most of the vehicles covered by this information, horizontal and vertical aiming of each sealed beam unit is provided by two adjusting screws which move the retaining ring and adjusting plate against the tension of a coil spring. There is no adjustment for focus; this is done during headlight manufacturing.

Because the composite headlight assembly is bolted into position, no adjustment should be necessary or possible. Some applications, however, may be bolted to an adjuster plate or may be retained by adjusting screws. If so, follow this procedure when adjusting the lights, BUT always have the adjustment checked by a reputable shop.

Before removing the headlight bulb or disturbing the headlamp in any way, note the current settings in order to ease headlight adjustment upon reassembly. If the high or low beam setting of the old lamp still works, this can be done using the wall of a garage or a building:

  1. Park the vehicle 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 which is no less than 6 feet (1.8m) high and 12 feet (3.7m) wide. The front of the vehicle should be about 25 feet (7.6m) from the wall.
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Fig. Fig. 5: Location of the aiming screws on most vehicles with sealed beam headlights



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Fig. Fig. 6: Dual headlight adjustment screw locations - one side shown here (other side should be mirror image)



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Fig. Fig. 7: Example of headlight adjustment screw location for composite headlamps

  1. If aiming is to be performed outdoors, it is advisable to wait until dusk in order to properly see the headlight 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 headlights ON and mark the wall at the center of each light's low beam, then switch on the brights and mark the center of each light's high beam. A short length of masking tape which is visible from the front of the vehicle may be used. Although marking all four positions is advisable, marking one position from each light should be sufficient.
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Fig. Fig. 8: Low beam headlight pattern alignment



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Fig. Fig. 9: High beam headlight pattern alignment

  1. If neither beam on one side is working, and if another like-sized vehicle is available, park the second one in the exact spot where the vehicle was and mark the beams using the same-side light. Then switch the vehicles so the one to be aimed is back in the original spot. It must be parked no closer to or farther away from the wall than the second vehicle.
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  3. Perform any necessary repairs, but make sure the vehicle is not moved, or is returned to the exact spot from which the lights were marked. Turn the headlights ON and adjust the beams to match the marks on the wall.
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  5. Have the headlight adjustment checked as soon as possible by a reputable repair shop.
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