Chevrolet 2007 HH7 Owner's Manual page 328

To adjust the vertical aim, do the following:
1. Open the hood. See Hood Release on
page 297 for more information.
2. Find the aim dot on the lens of the low-beam
headlamp.
3. Measure the distance from the ground to the
aim dot on the low-beam headlamp. Record
the distance.
328
4. At the wall measure from the ground
upward (A) to the recorded distance
from Step 3 and mark it.
5. Draw or tape a horizontal line (B) on the wall
the width of the vehicle at the height of the
mark in 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.