How do you aim headlights on 2003 Chevy Malibu?

To aim the headlights on a 2003 Chevy Malibu, park the vehicle on a level surface about 25 feet from a wall. Turn on the headlights and measure the height from the ground to the center of the headlight lens. Mark this height on the wall, then adjust the horizontal and vertical alignment screws on the headlight assembly until the top of the beam is just below the mark and the center of the beam is aligned with the center of the vehicle.