Bulb socket BUICK CENTURY 1999 Owner's Manual

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Bulb Replacement
In this section you'll find directions for changing the
bulbs on your vehicle. See ªReplacement Bulbsº in the
Index to find the type of bulb you should use.
For any bulb changing procedure not listed in this
section, contact your dealer service department.
Halogen Bulbs
CAUTION:
Halogen bulbs have pressurized gas inside and
can burst if you drop or scratch the bulb. You or
others could be injured. Be sure to read and
follow the instructions on the bulb package.
Headlamps
1. Open the hood.
2. Pull up on the headlamp retainers to release the
assembly locator tabs.
3. Slide the headlamp assembly out of the slots.
4. Remove the bulb socket from the
headlamp assembly.

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5. Remove the rubber access cover (from behind the
bulb you are replacing).
6. Quarter twist and turn the bulb socket and remove it
from the lamp.
7. Lift the plastic locking tab on the electrical
connector and pull the connector from the headlamp
bulb socket.8. Connect the new headlamp bulb to the wiring harness,
making sure the connector tab snaps into place.
9. Insert the bulb socket into the headlamp assembly.
10. Reverse all steps and reassemble the headlamp
assembly, then check the lamps.
Headlamp Aiming
Your vehicle has a headlamp system equipped with
horizontal and vertical aim indicators. The aim has been
pre
-set at the factory and should need no further
adjustment. This is true even though your vertical and
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 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 it to your dealer
for service; however, it is possible for you to re
-aim
your headlamps as described in the following procedure.

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Passenger's Side Headlamp Shown
B. Horizontal aim adjustment screw
C. Horizontal block index plate
D. Vertical aiming level
Start with the horizontal aim. The adjustment screws can
be turned with an E8 Torx

socket.Once the horizontal aim is adjusted, then adjust the
vertical aim.
1. Turn the horizontal aiming screw until the indicator
is lined up with zero.
2. Turn the vertical aiming screw until the level bubble
is lined up with zero.
Front Parking and Turn Signal Lamp
1. Remove the headlamp assembly. Refer to the
removal procedure earlier in this section.
2. Remove the rubber bulb access cover.
3. Twist and pull the sidemarker lamp socket
counterclockwise from the headlamp assembly.
4. Holding the base of the bulb, pull the bulb from
the socket.
5. Push the new bulb into the socket.
6. Put the socket back into the headlamp assembly and
turn it clockwise until it is secure.
7. Replace the rubber bulb access cover.
8. Replace the headlamp assembly.

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6-35 Center High-Mounted Stoplamp
1. Open the trunk.
2. Reach through the access opening in the trunk.
3. Remove the bulb by turning it one-quarter of a
turn counterclockwise.
4. Place the new bulb into the bulb socket.
5. Turn the bulb one
-quarter of a turn clockwise
to replace.
6. Close the trunk.

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6-36 Tail/Stop/Turn Signal Lamp
1. Remove the plastic wing nuts (A). (Pliers may be
required to remove the wing nuts.)
2. Pull the taillamp housing (B) away from the body of
the vehicle.
3. Squeeze the tab on the socket and turn the
socket counterclockwise.
4. Pull out the socket.
5. Pull the bulb out of the socket. (There are two bulbs
on each taillamp.)
6. Push in a new bulb.
7. Replace the socket into the housing and
turn clockwise.
8. Replace the taillamp housing to the body of
the vehicle.
9. Install and tighten the three plastic wing nuts.

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6-37 Trunk Lid Applique
1. Open the trunk lid halfway.
2. Remove the wing nuts (A) from the studs on the
applique. (There are eight wing nuts. Pliers may be
required to remove them.)
3. Remove the applique from the trunk lid.
4. Turn the sockets (B) counterclockwise.
5. Pull the bulb out of the socket.
6. Push in the new bulb.
7. Replace the socket in the housing and
turn clockwise.
8. Connect the applique to the lid.
9. Reconnect the wing nuts to the studs on the
applique and hand
-tighten.
10. Close the trunk lid.

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6-38 Back-Up Lamp
The back-up lamps are located in the trunk lid applique.
(Refer to the trunk lid applique removal procedure earlier
in this section for graphic and further instructions.)
1. Remove the trunk lid applique.
2. Twist and pull the back
-up lamp socket from the
trunk lid applique.
3. Twist and pull the bulb from the back
-up
lamp socket.
To install the new bulb:
1. Twist and push the bulb into the back
-up
lamp socket.
2. Twist and push the back
-up lamp socket into the
trunk lid applique.
3. Reinstall the trunk lid applique.
Dome Lamp (If Equipped)
1. Grasp the front center and rear center positions of the
dome lamp housing and squeeze together until the
housing releases from the base plate. A screwdriver
may be necessary to pry the assembly loose.
2. Lift the plastic locking tab on the electrical
connector and pull the connector from the dome
lamp assembly.
3. Grasp the bulb housing located in the center of the
assembly and pull straight up.
4. Pull the bulb out of the socket.
5. Push in a new bulb.
6. Replace the socket into the dome lamp assembly.
7. Reconnect the dome lamp assembly to the wiring
harness, making sure the connector tab snaps
into place.
8. Reposition the dome lamp assembly to the roof, and
gently push the assembly into the base plate.