Headlamp aiming, Headlamp aiming -49 – GMC 2009 Sierra User Manual

Page 361

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Headlamp Aiming

The vehicle has a visual optical headlamp aiming
system. The aim of the headlamps have been preset
at the factory and should need no further adjustment.

However, if the vehicle is damaged in a crash, the aim
of the headlamps may be affected and adjustment
may be necessary.

If oncoming vehicles flash their high beams at you,
this may mean the vertical aim of your headlamps
needs to be adjusted.

It is recommended that the vehicle is taken to your
dealer/retailer for service if the headlamps need to
be adjusted. It is possible however, to re-aim the
headlamps as described.

The vehicle should:

Be placed so the headlamps are 25 ft. (7.6 m)
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.

Normally loaded with a full tank of fuel and
one person or 160 lbs (75 kg) sitting on the
driver seat.

Have the tires properly inflated.

Have the spare tire is 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.

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