headlamp BUICK CENTURY 1999 User Guide

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6-31
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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6-32
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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6-33
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.
The vehicle should be properly prepared as follows:

The vehicle must have all four tires on a perfectly
level surface.

If necessary, pads may be used on an uneven 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.

There should not be any cargo or loading of the
vehicle, except it should have a full tank of fuel and
one person or 160 lbs. (75 kg) on the driver's seat.

Close all doors.

Tires should be properly inflated.

Rock the vehicle to stabilize the suspension.
Driver's Side Headlamp Shown
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 is at the center of the headlamp cover (A) and
the aiming screw for the horizontal aim indicator is on
the outboard side of the headlamp cover (B).

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6-34
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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6-49
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.
See ªChanging a Flat Tireº in the Index for
more information.
Used Replacement Wheels
CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used or
how far it's been driven. It could fail suddenly
and cause an accident. If you have to replace a
wheel, use a new GM original equipment wheel.
Tire Chains
NOTICE:
Use tire chains only where legal and only when
you must. Use only SAE Class ªSº type chains
that are the proper size for your tires. Install
them on the front tires and tighten them as
tightly as possible with the ends securely
fastened. Drive slowly and follow the chain
manufacturer's instructions. If you can hear the
chains contacting your vehicle, stop and retighten
them. If the contact continues, slow down until it
stops. Driving too fast or spinning the wheels
with chains on will damage your vehicle.

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6-59 Headlamp Wiring
The headlamp wiring is protected by a circuit breaker in
the underhood electrical center. An electrical overload
will cause the lamps to go on and off, or in some cases
to remain off. If this happens, have your headlamp
system checked right away.
Windshield Wipers
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 fixed.
Power Windows and Other Power Options
Circuit breakers in the fuse panel 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 fixed.
Fuses and Circuit Breakers
The wiring circuits in your vehicle are protected from
short circuits by a combination of fuses, circuit breakers
and fusible thermal links in the wiring itself. This
greatly reduces the chance of fires 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 you
replace a bad fuse 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 fuses.

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6-63
Relay Description
9 Cooling Fan 2
10 Cooling Fan 3
11 Starter Solenoid
12 Cooling Fan 1
13 Ignition Main
14 Not Used
15 A/C Clutch
16 Horn
17 Not Used
18 Not Used
19 Fuel Pump
20 Not Used
21 Generator
22 ECM
23 A/C Compressor Clutch
24 Cooling Fan
25 Electronic Ignition
26 TransaxleFuse Description
27 Horn
28 Fuel Injector
29 Oxygen Sensor
30 Engine Emissions
31 Not Used
32 Headlamp (Right)
33 Rear Compartment Release
34 Parking Lamps
35 Fuel Pump
36 Headlamp (Left)
37 Spare
38 Spare
39 Spare
40 Spare
41 Spare
42 Spare
43 Fuse Puller
SYMBOL A/C Compressor Clutch Diode

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6-64
Replacement Bulbs
Exterior Lamps Bulb Number
Back
-up 1156. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center High
-Mounted Stop 3155. . . . . . . . . . . . . . .
Front Parking/Turn Signal 4157NAK. . . . . . . . . . .
Headlamp, High Beam 9005. . . . . . . . . . . . . . . . . .
Headlamp, Low Beam 9006. . . . . . . . . . . . . . . . . . .
Stop/Tail/Turn Signal 3057. . . . . . . . . . . . . . . . . . .
Tail (Applique) 194. . . . . . . . . . . . . . . . . . . . . . . . .
Interior Lamps Bulb Number
Dome Lamp 9425542. . . . . . . . . . . . . . . . . . . . . . .
*For service information on these bulbs, contact your
dealer service department.
Capacities and Specifications
4T60E:
Automatic Transaxle
Pan Removal and Replacement 7.0 quarts (6.7 L). . .
After Complete Overhaul 9.6 quarts (9.2 L). . . . . .
* When draining/replacing converter, more fluid will
be needed.
Cooling System Including
Reservoir 11.6 quarts (10.9 L) . . . . . . . . . . . . . . . . .
Refrigerant (R
-134a),
Air Conditioning*1.88 lbs. (0.85 kg) . . . . . . . . . . .
*See ªAir Conditioning Refrigerantsº later in
this section.
Engine Crankcase
Oil and Filter Change 4.5 quarts (4.3 L). . . . . . . . .
Wheel Nut Torque100 lb
-ft (140 N´m) . . . . . . . . . .
Fuel Tank17.5 gallons (66.2 L) . . . . . . . . . . . . . . . . .
*Note: All capacities are approximate. When adding, be
sure to fill to the approximate level, as recommended in
this manual. See ªRecommended Fluids and Lubricantsº
in the Index.

9-
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9-1
Section 9 Index
A
dding Equipment to the Outside of Your Vehicle 6-3 . . . . .
Air Bag
How Does it Restrain 1
-24 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-21, 2-51 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System 1-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-23 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-24 . . . . . . . . . . . . . . .
When Should it Inflate 1-23 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning 3-3, 3-6, 3-8 . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-65 . . . . . . . . . . . . . . . . . . . . .
Alarm, Instant 2-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance, Tire 6-48 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-55 . . . . . . . . . . . . . . . . . . . . . .
AM-FM Stereo 3-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM-FM Stereo with Cassette Tape and Compact
Disc Player with Automatic Tone Control 3-21 . . . . . . . . . .
AM-FM Stereo with Cassette Tape Player 3-14 . . . . . . . . . . .
AM-FM Stereo with Cassette Tape Player and
Automatic Tone Control 3-17 . . . . . . . . . . . . . . . . . . . . . . . .
Antenna
Backglass 3
-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diversity 3-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Mast 3-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Antifreeze 6
-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock
Brake System Warning Light 2-53, 4-7 . . . . . . . . . . . . . . . .
Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Theft, Radio 3-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care Materials 6-57 . . . . . . . . . . . . . . . . . . . . . . .
Arbitration Program 8-3, 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest, Front Storage 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest, Rear Storage 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Astroroof 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Controls, Steering Wheel Touch Control 3-29 . . . . . . .
Audio Equipment, Adding 3-30 . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems, Tips 3-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Down Window 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic
Headlamp Control 2
-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overdrive (
)2-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Door Locks 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Check 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Fluid 6-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle Operation 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transaxle PARK (P) Mechanism Check 7-17 . . . . . . . . . . .

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9-3
Circuit Breakers and Fuses 6-59 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner/Filter, Engine Air 6-16 . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps/Lenses 6-54 . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass Surfaces 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside of Your Vehicle 6-50 . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components 6-52 . . . . . . . . . . . . . . . . . . . . .
Leather 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of Your Vehicle 6-53 . . . . . . . . . . . . . . . . . . . . . . . .
Special Problems 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-53 . . . . . . . . . . . . . . . . . . .
Clock, Setting the 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc
Care 3
-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Player 3-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Player Care 3-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Player Errors 3-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Spare Tire 5-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control, Loss of 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant
Bleed Valves 5
-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovery Tank 5-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coolant Heater, Engine 2
-19 . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 5-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Lamps 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 8-7 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Light 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cupholders 2-44, 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Assistance
for Text Telephone Users 8
-4 . . . . . . . . . . . . . . . . . . . . . . . .
Information 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 8-2 . . . . . . . . . . . . . . . . . . . .
Damage, Finish 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage, Sheet Metal 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps 2-39 . . . . . . . . . . . . . . . . . . . . . . . . .
Dead Battery 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defects, Reporting Safety 8-9, 8-10 . . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogging 3-4, 3-6, 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrosting 3-4, 3-6, 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed
Entry Lighting 2
-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exit Lighting 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamp Illumination 2-39 . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions, Vehicle 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dolby B Noise Reduction 3-17, 3-21, 3-24 . . . . . . . . . . . . . .
Dome Lamp Bulb Replacement 6-38 . . . . . . . . . . . . . . . . . . . .
Door Locks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door/Trunk Ajar Warning Light 2-63 . . . . . . . . . . . . . . . . . . .
Driver Position 1-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .