How do you adjust headlight beam for 2003 Tahoe?

To adjust the headlight beam on a 2003 Chevy Tahoe, first park the vehicle on a level surface about 25 feet from a wall or garage door. Turn on the headlights and mark the center of the light beams on the wall with tape. Locate the adjustment screws on the headlight assembly—typically, there are two: one for vertical and one for horizontal adjustment. Use a screwdriver to turn the screws until the beams are aligned with the marked points.