GMC 22853029 Headlight Assembly, (W/ Front Side Marker & Parking & T/Side

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To adjust the headlights on a vehicle, locate the vertical adjustment screws behind each headlight housing and insert an Allen wrench into the top. There are no horizontal adjustment screws. One simple method for adjusting the headlights requires masking tape, a blank wall, and a level floor. Position masking tape vertically on the wall in relation to the vehicle centerline and the centerlines of both headlights. Then, position a horizontal tape line in relation to the centerline of all the headlights. Adjustments should be made with the vehicle parked 25 feet from the wall, sitting level, the gas tank half-full, and no 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. Adjustment is made by turning the adjusting screw clockwise to raise the beam and counterclockwise to lower the beam. With the high beams on, the high-intensity zone should be vertically centered with the exact center just below the horizontal line. It is recommended to have the headlights adjusted by a dealer service department or service station at the earliest opportunity.

After removing the headlight housing, you can proceed with the installation, which is the reverse of the removal process. Remember to adjust the headlights after installation.