GMC 2011 Sierra Denali, Owner'S Manual

Page: 376 / 492

10-32 Vehicle Care
The vehicle should:
. Be placed so the headlamps
are 7.6 m (25 ft) from a
light
‐ colored wall.
. Have all four tires on a level
surface which is level all the
way to the wall.
. Be placed so it is perpendicular
to the wall.
. Not have any snow, ice, or mud
on it.
. Be fully assembled and all other
work stopped while headlamp
aiming is being performed.
. Be loaded with a full tank of fuel
and one person or 75 kg
(160 lbs) sitting on the
driver seat.
. Have the tires properly inflated.
. Have the spare tire in its proper
location in the vehicle.
Headlamp aiming is done with the
vehicle's low-beam headlamps.
The high-beam headlamps will be
correctly aimed if the low-beam
headlamps are aimed properly.
To adjust the vertical aim:
1. Open the hood. See Hood on
page 10 ‑ 4
2. Locate the aim dot on the lens of
the low ‐ beam headlamp.
3. Record the distance from the
ground to the aim dot on the
low
‐ beam headlamp.
4. At a 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.