GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Headlights

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5


CAUTION
Halogen bulbs contain a gas under pressure. Handling a bulb improperly may cause the bulb to shatter into flying glass fragments. To help avoid personal injury, turn headlight switch OFF, allow the bulb to cool and wear eye protection.

  1. Remove the headlight bezel (outer trim around sealed beam).
  2.  
  3. Remove the sealed beam retainer ring screws and the retainer ring.
  4.  
  5. Lift the sealed beam out and disconnect it from the electrical connector. If the vehicle is equipped with monitor lights, remove the rubber sleeve from the bulb and retain it.
  6.  
  7. To install, connect the sealed beam to the electrical connector, and reinstall the monitor light sleeve if equipped. Hold the sealed beam in place and install the retaining ring and screws. Install the headlight bezel and adjust headlight aim.
  8.  



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Fig. Fig. 1: Remove the headlight bezel trim screws



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Fig. Fig. 2: Remove the bezel from the panel



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Fig. Fig. 3: Remove the retainer ring screws. It may be helpful to soak these with penetrating oil first



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Fig. Fig. 4: Remove the retainer ring; be careful not to damage it



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Fig. Fig. 5: Pull the headlight out only far enough to reach the connector, then disconnect it

AIMING



See Figures 6 and 7

The headlights must be properly aimed to provide the best, safest road illumination. The lights should be checked for proper aim, and adjusted if necessary, after installing a new sealed beam unit or if the front end sheet metal has been replaced. The headlamps should be aimed by a professional with a special alignment tool. Certain state and local authorities may vary this procedure, but use the procedure below for temporary adjustments.

The vehicle's fuel tank should be about half full when adjusting the headlights. Tires should be properly inflated, and if a heavy load is carried in the trunk or in the cargo area of station wagons, it should remain there.

Horizontal and vertical aiming of each sealed beam unit is provided by two adjusting screws, which move the mounting ring in the body against the tension of the coil spring.

  1. Place the car on a level floor with headlamps 25 ft. from a light colored wall.
  2.  
  3. Tape three vertical lines on the wall, one for the vertical center of the car and two for the vertical center of the headlamps. Then, tape one horizontal line for the horizontal and vertical center of the headlamps.
  4.  
  5. Adjust the low beams so the high intensity zone is just below the horizontal line and to the right of the outboard vertical lines.
  6.  
  7. Adjust the high beams so the high intensity zone is centered where the outboard lines intersect with the horizontal line.
  8.  



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Fig. Fig. 6: Headlamp aiming



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Fig. Fig. 7: Headlamp aiming screws

 
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