Buick 2001 Regal Owner's Manual page 293

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.
Front Parking and Turn Signal Lamps
1. Remove the headlamp assembly. Refer to the
removal procedure earlier in this section.
2. Remove the rubber bulb access cover.
3. Twist the sidemarker lamp socket counterclockwise
and pull it from the headlamp assembly.
4. Holding the base of the bulb, pull the old bulb from
the socket.
5. Push the new bulb into the socket.
6. Reverse Steps 1 through 3 to reinstall the
lamp assembly.
6-42
Center High-Mounted Stoplamp
1. Open the trunk.
2. Reach through the access opening in the trunk.