How do you adjust 2002 Chevrolet Trailblazer front headlights?

To adjust the headlights on a 2002 Chevrolet Trailblazer, first, park the vehicle on a level surface about 25 feet from a wall. Turn on the headlights and mark the center of the light beam with tape on the wall. Using a flathead screwdriver, adjust the vertical and horizontal alignment screws located on the headlight assembly until the top of the beam is at or just below the tape mark and the beam is centered. Always check the adjustment by ensuring the headlights illuminate the road effectively without blinding other drivers.