2002 CADILLAC SEVILLE Owners Manual

6-40
Headlamp Aiming
Your vehicle has a visual optical headlamp aiming
system equipped with horizontal aim indicators. The
aim has been preset at the factory and should need no
further adjustment. This is true even though your
horizontal aim indicators may not fall exactly on
the ª0º (zero) marks on their scales.If your vehicle is damaged in an accident, the headlamp
aim may be affected. Aim adjustment to the low beam
may be necessary if it is difficult to see lane markers
(for horizontal aim), or if oncoming drivers flash their
high beams at you (for vertical aim). If you believe your
headlamps need to be re
-aimed, we recommend that
you take your vehicle to your dealer for service.
However, it is possible for you to re
-aim your
headlamps as described in the following procedure.
NOTICE:
To make sure your headlamps are aimed
properly, read all the instructions before
beginning. Failure to follow these instructions
could cause damage to headlamp parts.

6-41
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.

6-42
Headlamp Horizontal Aiming
Turn the horizontal
aiming screw (A) until
the indicator (B) is
lined up with zero.
Once the horizontal aim is adjusted, then adjust the
vertical aim.Headlamp Vertical Aiming
NOTICE:
Horizontal aiming must be performed before
making any adjustments to the vertical aim.
Adjusting the vertical aim first will result in an
incorrect headlamp aim.
1. Find the aim dot on the lens of the low beam lamps.
2. Measure the distance from the ground to the aim dot
on each low beam lamp. Record this distance.

6-43
3. At the wall or other flat surface, measure from the
ground upward the recorded distance from Step 2
and draw or tape a horizontal line the width of
the vehicle.4. Turn on the low-beam headlamps and place a piece
of cardboard or equivalent in front of the headlamp
not being aimed. This should allow only the beam of
light from the headlamp being aimed to be seen on
the flat surface.
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.

6-44
5. Turn the vertical aiming screw (C) until the
headlamp beam is aimed to the horizontal tape line.
The top edge of the cut
-off should be positioned at
the bottom edge of the horizontal tape line.
6. Repeat Steps 4
and 5 for the
opposite headlamp.

6-45 Front Turn Signal Lamps
1. The turn signal lamps are located on the outboard side
of the headlamps. To access, remove the headlamp.
See Steps 1, 2, 3, and 10 under ªHeadlampsº.
2. Press the bulb socket tab and turn the bulb
socket counterclockwise to unlock the socket from
the lamp housing.
3. To remove the old bulb, grasp the socket firmly and
pull the bulb out.
4. Install the new bulb and reverse the steps to reinstall
the lamp housing.
Rear Turn Signal Lamps and Taillamps
1. Open the trunk to gain access to the lamp housing.
2. Remove the rear
compartment sill plate
by removing the upper
convenience net
retainers, located at
each end, as shown.
3. Move the spare tire cover out of the way.
4. Pull the trunk trim away to access the wing nuts.

6-46
5. Remove the three wing nuts that fasten the taillamp
to the body.
6. Gently remove the taillamp from the body. The
taillamp is on the bottom of the housing and the rear
turn signal lamp is on the upper part of the housing.7. Press the bulb socket tab and turn the socket
counterclockwise to remove it. To remove the bulb,
grasp the socket firmly and pull the bulb out.
Once you have replaced the burned
-out bulb, reverse the
steps to reassemble the lamp assembly.

6-47
Windshield Wiper Blade Replacement
Windshield wiper blades should be inspected at least
twice a year for wear or cracking. See ªWiper Blade
Checkº in the Index for more information.
It's a good idea to clean or replace the wiper blade
assembly on a regular basis or when worn. For proper
windshield wiper blade length and type, see ªNormal
Maintenance Replacement Partsº in the Index.
To replace the wiper blade assembly do the following:
1. Lift the wiper up from the windshield and set into
the vertically
-locked position.
2. Press the tab that holds the wiper blade to the arm.
3. Slide the blade down and off the arm.
4. Slide in the new blade and snap into place.