GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Headlights

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Fig. Fig. 1 Remove these thumb screw when servicing the headlamps



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Fig. Fig. 2 Pull the lens assembly up and off of the tabs



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Fig. Fig. 3 Disconnect the connector from the burned out bulb



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Fig. Fig. 4 Remove the bulb. When installing, be careful not to touch the glass portion of the bulb



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Fig. Fig. 5 Connect the connector when bulb is seated in socket



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Fig. Fig. 6 Composite headlamp assembly-1990 Ninety-Eight



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Fig. Fig. 7 Headlamp assembly and connectors-1991-93 Ninety-Eight

HALOGEN LAMP BULB PRECAUTIONS





Halogen bulbs contain gas under pressure. Handling the bulb improperly can cause it too shatter into flying glass fragments. In order to minimize the possibility of personal injury, review the following guidelines.
 
If the headlights have been used, allow the bulbs too cool before servicing. Keep the headlight switch off during servicing; do not turn on until all items are in place.
 
Wear eye protection when working with halogen bulbs.
 
Handle the bulb unit by its base only. Avoid touching the glass portions.
 
Do not drop, scratch, or wet the bulb unit. If any occur, do not use the bulb.
 
Place the used bulb in the new bulb's carton and dispose of it immediately.
 
Keep halogen bulbs away from children.
 

REMOVAL & INSTALLATION



1990 Vehicles
  1. If replacing the headlamp lens assembly on Ninety-Eight, remove the bezel, then lens retaining crews. If only replacing the bulb, skip to Step 3.
  2.  
  3. On Buick, remove the thumb screws, pull the lamp up off the tab and out.
  4.  
  5. Turn the lamp socket lockring counterclockwise, disconnect the connector, and remove the headlamp socket. Vertical rocking may be required to remove.
  6.  
  7. Grip the bulb base and remove the headlamp bulb from the socket.
  8.  

To install:

  1. Grip the bulb base and install the bulb to the socket.
  2.  
  3. Install the socket, connect the connector and lock the lockring.
  4.  
  5. On Buick, install the lamp assembly on the tabs and install the thumb screws.
  6.  
  7. On Ninety-Eight, install the lens and bezel if removed.
  8.  
  9. Check operation of all front exterior lamps.
  10.  

1991-93 Vehicles
  1. Remove the thumb screws, and pull the lamp up off the tab and out.
  2.  
  3. Disconnect the headlamp connectors.
  4.  
  5. Rotate the headlamp bulb 1 / 4 turn counterclockwise and remove from the lamp assembly.
  6.  
  7. If servicing the lamp/lens assembly, remove other bulbs from composite unit.
  8.  

To install:

  1. Grip the bulb base and install the bulb to the socket by turning 1 / 4 turn clockwise.
  2.  
  3. Connect the connectors.
  4.  
  5. Install the lamp assembly on the tabs and install the thumb screws.
  6.  
  7. Check operation of all front exterior lamps.
  8.  

HEADLIGHT AIMING



Headlights should be checked for proper aim during your annual state inspection (each state has its own headlight aiming laws). If your state doesn't require state inspection, you should ideally have headlight aim checked annually, especially if you travel on rough road surfaces often. Headlights that are not aimed properly can create a dangerous situation by blinding oncoming drivers and by not illuminating the road properly for you. A universal do-it-yourself procedure that can be used in a pinch is given here, although it is not intended as the true method; expensive aiming tools are needed for that. If the headlights don't come close to straight ahead when aiming, something is properly broken; in fact if they are so far off as to catch your attention in the first place, a support piece probably broke.

  1. Park the car on a level surface, at least 15 ft. from a wall that is perpendicular to the ground surface. Make sure there is no excess weight in the trunk, unless you normally travel with that amount of weight in the car. Bounce the car a few times to settle the suspension.
  2.  
  3. Measure and record the distance from the ground to the center of each headlight lens.
  4.  
  5. Measure and record the distance between lens centers (from one side to the other side).
  6.  
  7. Turn the headlights on and adjust so the hot-spots (lit area of most concentrated intensity) are the same height from the ground and distance from each other that the lens centers were in Steps 2 and 3. Adjusting screws are located on the outer side (horizontal aim) and top (vertical aim) of the lens.
  8.  
  9. Adjust each headlight so the hot-spot drops about an inch.
  10.  
  11. Adjust each headlight so it points to the right about an inch on the wall; this will prevent glare in an oncoming driver's eyes.
  12.  
  13. Take your car to an approved inspection/service station and see how good you did!
  14.  

 
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