Hummer 2007 H3 Owner's Manual page 360

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.
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.
360
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.