Buick 2002 LeSabre Owner's Manual page 311

NOTICE:
Do not cover a headlamp to improve beam
-
cut off when aiming. Covering a headlamp may
cause excessive heat build
damage to the headlamp.
-
up which may cause
The top edge of the cut
the bottom edge of the horizontal tape line.
6. Repeat steps 4 and 5 for the opposite headlamp.
5. Turn the vertical
aiming screw (C)
until the headlamp
beam is aimed to
the horizontal
tape line.
-
off should be positioned at
6-39