2005 BUICK CENTURY headlamp

A. Vertical Aim Adjustment Screw
B. Horizontal Aim Adjustment Screw
Open the hood and locate the vertical and horizontal
aim indicators. The aiming screw for the vertical
aim indicator (A) is at the center of the headlamp cover
and the aiming screw for the horizontal aim indicator (B)
is on the outboard side of the headlamp cover.A. Horizontal Aim Adjustment Screw
B. Horizontal Block Index Plate
C. 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. Driver’s Side Headlamp Shown
Passenger’s Side Headlamp Shown
5-46

Bulb Replacement
For the proper type of replacement bulb, see
Replacement Bulbs on page 5-51.
For any bulb changing procedure not listed in this
section, contact your dealer.
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 (A) to release the
assembly locator tabs.
3. Disconnect the electrical connector (B) from the
headlamp assembly.
4. Slide the headlamp assembly out of the slots.
5-47

5. Remove the rubber access cover from behind the
bulb being replaced.
6. Turn the bulb socket one-quarter turn and remove it
from the headlamp assembly.
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 electrical
connector, making sure the connector tab snaps
into place.
9. Insert the bulb socket into the headlamp assembly.
10. Reverse all steps to reassemble the headlamp
assembly, then check the lamps.
Front Turn Signal and Parking Lamps
1. Remove the headlamp assembly. Refer to the
removal procedure earlier in this section.
2. Remove the rubber bulb access cover.
3. Twist the sidemarker lamp socket, located on
the outboard side of the headlamp assembly,
counterclockwise and pull it from the
headlamp assembly.
4. Holding the base of the socket, pull the old bulb
from the socket.
5. Push the new bulb into the socket.
6. Reverse Steps 1 through 3 to reinstall the
lamp assembly.
5-48

Back-Up Lamps
1. Open the trunk.
2. Remove the seven hex nuts (A) from the
lamp covering.
3. Remove the lamp covering.
4. Twist and pull the bulb socket (B) from the
lamp assembly.5. Twist and pull the old bulb from the bulb socket.
6. Twist and push the new bulb into the lamp socket.
7. Twist and push the lamp socket into the
lamp assembly.
8. Reverse Steps 2 and 3 to reinstall the
lamp covering.
Replacement Bulbs
Exterior Lamps Bulb Number
Back-Up Lamps 1156
Center High-Mounted
Stoplamp (CHMSL)3155
Front Turn Signal and
Parking Lamps4157NAK
High-Beam Headlamps 9005
Low-Beam Headlamps 9006
Taillamps and
Stoplamps/Turn Signal3057
Taillamp 194
For any bulb not listed here contact your dealer.
5-51

Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned and balanced
carefully at the factory to give you the longest tire life
and best overall performance.
If you notice unusual tire wear or your vehicle pulling
one way or the other, the alignment may need to
be reset. If you notice your vehicle vibrating when
driving on a smooth road, your wheels may need to
be rebalanced.
Wheel Replacement
Replace any wheel that is bent, cracked or badly rusted
or corroded. If wheel nuts keep coming loose, the
wheel, wheel bolts and wheel nuts should be replaced.
If the wheel leaks air, replace it (except some
aluminum wheels, which can sometimes be repaired).
See your dealer if any of these conditions exist.
Your dealer will know the kind of wheel you need.
Each new wheel should have the same load-carrying
capacity, diameter, width, offset and be mounted
the same way as the one it replaces.If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new GM
original equipment parts. This way, you will be sure to
have the right wheel, wheel bolts and wheel nuts
for your vehicle.
{CAUTION:
Using the wrong replacement wheels, wheel
bolts or wheel nuts on your vehicle can be
dangerous. It could affect the braking and
handling of your vehicle, make your tires lose
air and make you lose control. You could have
a collision in which you or others could be
injured. Always use the correct wheel, wheel
bolts and wheel nuts for replacement.
Notice:The wrong wheel can also cause problems
with bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper height,
vehicle ground clearance and tire or tire chain
clearance to the body and chassis.
SeeChanging a Flat Tire on page 5-70for
more information.
5-67

Headlamp Wiring
The headlamp wiring is protected by a circuit breaker in
the underhood fuse block. An electrical overload will
cause the headlamps to go on and off, or in some cases
to remain off. If this happens, have the headlamp
system checked right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by a circuit
breaker and a fuse. If the motor overheats due to heavy
snow, etc., the wiper will stop until the motor cools.
If the overload is caused by some electrical problem,
have it xed.
Power Windows and Other
Power Options
Circuit breakers in the instrument panel fuse block
protect the power windows and other power accessories.
When the current load is too heavy, the circuit breaker
opens and closes, protecting the circuit until the
problem is xed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from
short circuits by a combination of fuses, circuit breakers
and in the fuse block wiring itself. This greatly reduces
the chance of res caused by electrical problems.
Look at the silver-colored band inside the fuse. If the
band is broken or melted, replace the fuse. Be sure
a bad fuse is replaced with a new one of the identical
size and rating.
Instrument Panel Fuse Block
Some fuses are located
in a fuse block on the
passenger’s side of
the instrument panel.
Pull off the cover
labeled FUSES to
expose the fuse block.
5-91

Relays Usage
15 Not Used
16 Horn
17 Fog Lamps
18 Not Used
19 Fuel Pump
Fuses Usage
20 Not Used
21 Generator
22 Engine Control Module
23 Air Conditioner Compressor Clutch
24 Cooling Fan
25 Electronic Ignition
26 Transaxle
27 Horn
28 Fuel Injector
29 Oxygen Sensor
Fuses Usage
30 Engine Emissions
31 Fog Lamps
32 Right Headlamp
33 Rear Compartment Release
34 Parking Lamps
35 Fuel Pump
36 Left Headlamp
37 Not Used
38 Not Used
39 Not Used
40 Not Used
41 Not Used
42 Not Used
43 Not Used
§Air Conditioner Compressor
Clutch Diode
5-95

B
Battery..........................................................5-39
Run-Down Protection...................................3-17
Before Leaving on a Long Trip.........................4-22
Brake
Anti-Lock Brake System (ABS)........................ 4-7
Emergencies................................................ 4-9
Parking......................................................2-24
System Warning Light..................................3-32
Brakes..........................................................5-36
Braking........................................................... 4-6
Braking in Emergencies..................................... 4-9
Break-In, New Vehicle.....................................2-17
Bulb Replacement...........................................5-47
Back-Up Lamps...........................................5-51
Center High-Mounted Stoplamp (CHMSL)........5-49
Front Turn Signal and Parking Lamps.............5-48
Halogen Bulbs............................................5-47
Headlamp Aiming........................................5-45
Headlamps.................................................5-47
Replacement Bulbs......................................5-51
Taillamps, Turn Signal, and Stoplamps............5-50
Buying New Tires...........................................5-64
C
California Fuel.................................................. 5-6
Canadian Owners................................................ ii
Capacities and Specications............................5-96Carbon Monoxide...................2-12, 2-27, 4-26, 4-38
Care of
Safety Belts................................................5-85
Your Cassette Tape Player............................3-65
Your CD Player...........................................3-66
Your CDs ...................................................3-66
Center High-Mounted Stoplamp (CHMSL)...........5-49
Center Passenger Position, Safety Belts.............1-20
Chains, Tire...................................................5-68
Charging System Light....................................3-32
Check
Engine Light...............................................3-36
Checking Things Under the Hood......................5-10
Chemical Paint Spotting...................................5-88
Child Restraints
Child Restraint Systems...............................1-33
Infants and Young Children...........................1-30
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-40
Older Children.............................................1-27
Securing a Child Restraint Designed for
the LATCH System...................................1-42
Securing a Child Restraint in a Center
Rear Seat Position...................................1-44
Securing a Child Restraint in a Rear
Outside Seat Position...............................1-42
Securing a Child Restraint in the Right
Front Seat Position...................................1-46
Top Strap...................................................1-37
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