1997 Buick Park Avenue Owner's Manual - Page 304

If you find that the headlamp aiming needs adjustment, follow these steps: Start with the vertical headlamp aim. Adjustment screws can be turned with an E8 Tom@socket or T15 Torx screwdriver. Taillamps 1. Open the trunk. On either side of the rear of the trunk is a plastic retainer that holds the cargo net and taillamp assembly in place. 1. Check the vertical aim for each headlamp. The vehicle must be on a level surface. Turn the vertical aiming screw until the bubble in the level is lined up with the 0 (zero). 2. Now adjust the horizontal aim. The horizontal aiming device is located on the inboard side of each headlamp assembly, down lower from the vertical aiming device. Check the horizontal aim and adjust it as necessary. There is a round dial located on the horizontal adjuster, with an alignment notch on it. Turn the horizontal aiming screw until the zero is lined up with the notch. 2. Unhook the cargo net from the cargo net retainer and remove the retainer by turning it counterclockwise. 3. Pull back the trunk trim panel. 3. Now, visually recheck the vertical aim, to make sure it isstill correct after the horizontal aim adjustment. Readjust, if necessary.