Pontiac 1995 Grand Prix Owner's Manual page 244

If
you find that the headlamp aiming needs adjustment,
Start with the horizontal ai.m+ Don't try to adjust the
vertical aim Fkrst.
follow these steps:
1.
Check the horizontal aim indicator. The pointer
should be lined up with
0
(zero).
2. If the pointer isn't
at 0 (zero), turn the
horizontal aiming screw
to adjust the aim.
3 , Check the vertical aim indicator. The bubble should
be centered
on 0 (zero).
7 - 1
4. If the bubble isn't on
0 (zero), turn
aiming screw
the aim.
the vertical
to adjust
6-31