Cadillac 20861479 Headlight Assembly, (W/ Front Side Marker & Parking & T/Side

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Headlights have two spring loaded adjusting screws, one controlling up-and-down movement and one controlling left-and-right movement. Later models have a built-in aiming gauge. On these models, the adjuster must be set to zero before making adjustments by turning the adjusting screw. There are several methods of adjusting the headlights, with the simplest requiring a large level area with a blank wall. Masking tape should be positioned vertically on the wall in reference to the vehicle centerline and the centerlines of both headlights, and a horizontal tape line should be positioned in reference to the centerline of all the headlights. It may be easier to position the tape on the wall with the vehicle parked only a few inches away. Adjustment should be made with the vehicle parked 25 feet from the wall, sitting level, the gas tank half-full and no unusually heavy load in the vehicle. Starting with the low beam adjustment, position the high intensity zone so it is two inches below the horizontal line and two inches to the side of the headlight vertical line, away from oncoming traffic. Adjustment is made by turning the top adjusting screw clockwise to raise the beam and counterclockwise to lower the beam. The adjusting screw on the side should be used in the same manner to move the beam left or right. With the high beams on, the high intensity zone should be vertically centered with the exact center just below the horizontal line. It may not be possible to position the headlight aim exactly for both high and low beams. If a compromise must be made, keep in mind that the low beams are the most used and have the greatest effect on safety. Have the headlights adjusted by a dealer service department or service station at the earliest opportunity.

To remove the headlight bulb(s) or disconnect the electrical connector, pull the housing out and access the bulbs or connector as needed.