Hummer 2006 H3 Owner's Manual page 318

To adjust the vertical aim, do the following:
1. Open the hood. See Hood Release on page 5-11
for more information.
2. Find the aim dot on the lens of the headlamp.
3. Measure the distance from the ground to the aim
dot on the headlamp. Record the distance.
4. At the wall or other flat surface, measure from the
ground upward the recorded distance from Step 2
and mark it.
5. Draw or tape a horizontal line the width of the
vehicle at the wall or other flat surface where it
was marked it Step 4.
5-46
Notice: Do not cover a headlamp to improve beam
cut-off when aiming. Covering a headlamp may
cause excessive heat build-up which may cause
damage to the headlamp.
6. Turn on the headlamps and place a piece of
cardboard or equivalent in front of the headlamp
not being aimed. This should allow only the beam
of light from the headlamp being aimed to be
seen on the flat surface.
Passenger's Side Shown
7. Locate the vertical headlamp aiming screws, which
are under the hood near each headlamp assembly.
The adjustment screw can be turned with an
®
E8 Torx socket or T15 Torx
®
screwdriver.