2003 Buick Century Owner's Manual - Page 267

Driver's Side Headlamp Shown Passenger's Side Headlamp Shown A. Horizontal Aim Adjustment Screw B. Horizontal Block Index Plate C. Vertical Aiming Level Start with the horizontal aim. The adjustment screws can be turned with an E8 Tom@ socket. Once the horizontal aim is adjusted, then adjust the vertical aim. 1. Turn the horizontal aiming screw until the indicator is lined up with zero. 2. Turn the vertical aiming screw until the level bubble is lined up with zero. A. Vertical Aim Adjustment Screw B. Horizontal Aim Adjustment Screw Open the hood and locate the vertical and horizontal aim indicators. The aiming screw for the vertical aim indicator (A) is at the center of the headlamp cover and the aiming screw for the horizontal aim indicator is on the outboard side of the headlamp cover (B). 5-50