Pontiac 2008 Grand Prix Owner's Manual page 323

Driver's Side shown
7. Locate the vertical headlamp aiming screws, which
are under the hood, near the headlamps. Turn the
vertical aiming screw until the headlamp beam is
aimed to the horizontal tape line.
The adjustment screws can be turned with a 6 mm
hex key bit socket or a 6 mm hex key.
8. Turn the vertical aiming screw until the headlamp
beam is aimed to the horizontal tape line. Turn it
clockwise or counterclockwise to raise or lower the
angle of the beam.
9. Make sure that the light from the headlamp is
positioned at the bottom edge of the horizontal tape
line. The lamp on the left (A) shows the correct
headlamp aim. The lamp on the right (B) shows the
incorrect headlamp aim.
10. Repeat Steps 7 through 9 for the opposite
headlamp.
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