Cadillac CTS-V 2009 Owner's Manual page 364

It is recommended that the vehicle is taken to your
dealer/retailer for service if the headlamps need to be
re-aimed. 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 all tires properly inflated.
•
If your vehicle has a spare tire, ensure the spare
tire is in its original 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.
5-54
To adjust the vertical aim:
1. Open the hood. See Hood Release on page 5-12
for more information.
Halogen Headlamps