Cadillac 2004 Seville, Owner'S Manual, Page: 310 / 410

The vehicle should be properly prepared as follows:
•
The vehicle should be placed so the headlamps are
25 ft. (7.6 m) from a light colored wall or other flat
surface.
•
The vehicle must have all four tires on a perfectly
level surface which is level all the way to the wall
or other flat surface.
•
The vehicle should be placed so it is perpendicular
to the wall or other flat surface.
•
The vehicle should not have any snow, ice or mud
attached to it.
•
The vehicle should be fully assembled and all other
work stopped while headlamp aiming is being done.
•
The vehicle should be normally loaded with a
full tank of fuel and one person or 160 lbs (75 kg) on
the driver’s seat.
•
Tires should be properly inflated.
•
Start the vehicle and rock it to level the suspension.
Headlamp aiming is done with the vehicle low beam
lamps. The high beam lamps will be correctly aimed if
the low beam lamps are aimed properly.
The headlamp aiming devices are under the hood near
the headlamps.
If you believe your headlamps need horizontal (left/right)
adjustment, follow the horizontal aiming procedure. If
you believe your headlamps need only vertical
(up/down) adjustment, follow only the vertical aiming
procedure.
Adjustment screws can be turned with an E8 Torx
®
socket or T15 Torx screwdriver.
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