GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Headlights

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REMOVAL & INSTALLATION



Catera
  1. Open the hood.
  2.  
  3. Unscrew the self-locking tab on the radiator cover from the body to remove the radiator cover.
  4.  
  5. Remove the battery. Necessary for left side bulb replacement.
  6.  
  7. Remove the rubber protective cover from the back of the headlamp to reveal the bulb.
  8.  
  9. Separate the bulb fastening tangs.
  10.  
  11. Carefully remove the bulb.
  12.  
  13. Remove the electrical connection from the bulb.
  14.  

To install:

  1. Install the electrical connection to the bulb.
  2.  
  3. Snap the fastening tang in place to install the bulb.
  4.  
  5. Install the rubber protective cover to the back of the headlamp.
  6.  
  7. Install the battery. Necessary for left side bulb replacement.
  8.  
  9. Seat the tab to the body of the radiator cover.
  10.  
  11. Secure the radiator cover by turning the self-locking tab. Close the hood
  12.  

Except Catera
1990
  1. Make sure the headlight switch is OFF .
  2.  
  3. Remove the front cornering/side marker lamps.
  4.  
  5. Remove the 2 rear headlight assembly nuts.
  6.  
  7. Disconnect the wiring connectors from the headlight bulbs.
  8.  
  9. Remove the 2 screws through the grille and remove the headlight assembly.
  10.  
  11. Disconnect the lamp monitor connections from the headlight assembly.
  12.  
  13. If necessary, remove the headlight bulbs.
  14.  



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Fig. Headlight installation-1990 Deville and Fleetwood

To install:

  1. Install the bulbs in the headlight assembly.
  2.  
  3. Connect the lamp monitor connections.
  4.  
  5. Position the headlight assembly and install the 2 screws through the grille. Tighten to 13 inch lbs. (1.5 Nm).
  6.  
  7. Connect the wiring connectors to the headlight bulbs.
  8.  
  9. Install the 2 headlight assembly nuts and tighten to 13 inch lbs. (1.5 Nm).
  10.  
  11. Install the front cornering/side marker lamps.
  12.  
  13. Check the headlight aim.
  14.  

1991-98
  1. Make sure the headlight switch is OFF .
  2.  
  3. Remove the thumbscrews.
  4.  
  5. Pull out the headlight assembly and disconnect the wiring connectors from the headlight bulbs.
  6.  
  7. If necessary, remove the bulbs from the headlight assembly.
  8.  
  9. Disconnect the lamp monitor fiber optic cable.
  10.  



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Fig. Lift this cover to service the lamp



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Fig. It is difficult to extricate the bulb from the housing, but it can be done. This shows the two-finger method. A slight twist and the bulb/socket assembly is removed

To install:

  1. Connect the lamp monitor fiber optic cable.
  2.  
  3. Install the bulbs in the headlight assembly.
  4.  
  5. Connect the wiring connectors to the headlight bulbs.
  6.  
  7. Position the headlight assembly and install the thumbscrews.
  8.  
  9. Check the headlight aim.
  10.  



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Fig. The halogen bulb assembly is very compact. This one is a right angle application



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Fig. Unplug the bulb/socket and replace the entire assembly

AIMING THE HEADLIGHTS



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 that is equipped with headlight aiming tools. Improper adjustments may be both dangerous and illegal.

For most of the vehicles covered in this guide, 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.


NOTE
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 that 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 from the wall.
  2.  



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



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Fig. 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.
  2.  
  3. Turn the headlights ON and mark the wall at the center of each light's low beam, then switch on the bright lights and mark the center of each light's high beam. A short length of masking tape that 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.
  4.  



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Fig. Low-beam headlight pattern alignment



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Fig. 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.
  2.  
  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.
  4.  
  5. Have the headlight adjustment checked as soon as possible by a reputable repairs shop.
  6.  

 
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