- 1). Park your 2005 Yukon Denali directly in front of a vertical surface, such as a wall.
- 2). Mark on the wall, using tape, the vertical and horizontal positions of the headlights.
- 3). Measure out 25 feet away from the wall. Mark that spot on the ground with more tape.
- 4). Back up your Denali until the headlights are directly above the marked spot on the ground. Turn on your headlights.
- 5). Open your hood and insert the torx wrench into the star-shaped screw above the headlight you want to adjust. Turn the screw to change the vertical aim of the headlight. Aim the beam so that it hits within 2 inches of the tape on the wall.
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