2008 Hummer H3 Alpha Owner's Manual - Page 305

To adjust the vertical aim: 1. Open the hood. See Hood Release on page 5-11 for more information. 3. Record the distance from the ground to the aim dot on the headlamp. 4. At a wall, 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 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 wall. 2. Find the aim dot on the lens of the headlamp. 5-47