lock BUICK CENTURY 2005 Repair Manual

Total Weight on Your Vehicle’s Tires
Be sure the vehicle’s tires are inated to the upper limit
for cold tires. These numbers can be found on the
Tire-Loading Information label. SeeLoading Your
Vehicle on page 4-31. Be sure not to go over the
GVW limit for the vehicle, or the GAWR, including the
weight of the trailer tongue. If a weight distribution hitch
is used, make sure not to go over the rear axle limit
before applying the weight distribution spring bars.
Hitches
It is important to have the correct hitch equipment.
Crosswinds, large trucks going by and rough roads are
a few reasons why the right hitch is needed. Here
are some rules to follow:
The rear bumper on the vehicle is not intended for
hitches. Do not attach rental hitches or other
bumper-type hitches to it. Use only a frame-mounted
hitch that does not attach to the bumper.
If holes need to be made in the body of the vehicle to
install a trailer hitch, then be sure to seal the holes
later when the hitch is removed. If the holes are not
sealed, deadly carbon monoxide (CO) from the
exhaust can get into the vehicle. SeeEngine Exhaust
on page 2-27. Dirt and water can, too.
Safety Chains
Chains should always be attached between the vehicle
and the trailer. Cross the safety chains under the
tongue of the trailer so that the tongue will not drop to
the road if it becomes separated from the hitch.
Instructions about safety chains may be provided by
the hitch manufacturer or by the trailer manufacturer.
Follow the manufacturer’s recommendation for attaching
safety chains and do not attach them to the bumper.
Always leave just enough slack so the rig can be turned.
And, never allow safety chains to drag on the ground.
Trailer Brakes
Because the vehicle has anti-lock brakes, do not try to
tap into the vehicle’s brake system. If that is done,
both brake systems will not work well, or at all.
4-41

Wheel Replacement......................................5-67
Tire Chains..................................................5-68
If a Tire Goes Flat........................................5-69
Changing a Flat Tire.....................................5-70
Removing the Spare Tire and Tools................5-71
Removing the Flat Tire and Installing the
Spare Tire................................................5-73
Storing a Flat or Spare Tire and Tools............5-79
Compact Spare Tire......................................5-81
Appearance Care............................................5-82
Fabric/Carpet...............................................5-82
Vinyl...........................................................5-84
Leather.......................................................5-84
Instrument Panel..........................................5-85
Interior Plastic Components............................5-85
Glass Surfaces.............................................5-85
Care of Safety Belts......................................5-85
Weatherstrips...............................................5-85
Washing Your Vehicle...................................5-86
Cleaning Exterior Lamps/Lenses.....................5-86
Finish Care..................................................5-86Windshield and Wiper Blades.........................5-87
Aluminum Wheels.........................................5-87
Tires...........................................................5-87
Sheet Metal Damage.....................................5-88
Finish Damage.............................................5-88
Underbody Maintenance................................5-88
Chemical Paint Spotting.................................5-88
Vehicle Care/Appearance Materials..................5-89
Vehicle Identication......................................5-90
Vehicle Identication Number (VIN).................5-90
Service Parts Identication Label.....................5-90
Electrical System............................................5-90
Add-On Electrical Equipment..........................5-90
Headlamp Wiring..........................................5-91
Windshield Wiper Fuses................................5-91
Power Windows and Other Power Options.......5-91
Fuses and Circuit Breakers............................5-91
Instrument Panel Fuse Block..........................5-91
Underhood Fuse Block..................................5-94
Capacities and Specications..........................5-96
Section 5 Service and Appearance Care
5-2

Filling Your Tank
{CAUTION:
Fuel vapor burns violently and a fuel re can
cause bad injuries. To help avoid injuries to you
and others, read and follow all the instructions
on the pump island. Turn off your engine when
you are refueling. Do not smoke if you are near
fuel or refueling your vehicle. Keep sparks,
ames and smoking materials away from fuel.
Do not leave the fuel pump unattended when
refueling your vehicle — this is against the law
in some places. Keep children away from the
fuel pump; never let children pump fuel.The tethered fuel cap is located behind a hinged fuel
door on the driver’s side of the vehicle.
To remove the fuel cap, turn it slowly to the left
(counterclockwise). The fuel cap has a spring in it;
if the cap is released too soon, it will spring back to
the right.
While refueling, let the fuel cap hang by the tether
below the fuel ll opening.
5-8

{CAUTION:
If you spill fuel and then something ignites it,
you could be badly burned. Fuel can spray out
on you if you open the fuel cap too quickly.
This spray can happen if your tank is nearly full,
and is more likely in hot weather. Open the fuel
cap slowly and wait for any hiss noise to stop.
Then unscrew the cap all the way.
Be careful not to spill fuel. Do not top off or overll the
tank and wait a few seconds after you have nished
pumping before removing the nozzle. Clean fuel
from painted surfaces as soon as possible.
SeeWashing Your Vehicle on page 5-86.
When replacing the fuel cap, turn it to the right
(clockwise) until it clicks. Make sure the cap is fully
installed. The diagnostic system can determine if the
fuel cap has been left off or improperly installed.
This would allow fuel to evaporate into the atmosphere.
SeeMalfunction Indicator Lamp on page 3-36.
{CAUTION:
If a re starts while you are refueling, do not
remove the nozzle. Shut off the ow of fuel
by shutting off the pump or by notifying the
station attendant. Leave the area immediately.
Notice:If you need a new fuel cap, be sure to get
the right type. Your dealer can get one for you.
If you get the wrong type, it may not t properly.
This may cause your malfunction indicator lamp to
light and may damage your fuel tank and emissions
system. SeeMalfunction Indicator Lamp on
page 3-36.
5-9

A. Windshield Washer Fluid Reservoir. See “Adding
Washer Fluid” underWindshield Washer Fluid
on page 5-35.
B. Battery. SeeBattery on page 5-39.
C. Underhood Fuse Block. SeeUnderhood Fuse Block
on page 5-94.
D. Remote Positive (+) Battery Terminal. SeeJump
Starting on page 5-40.
E. Radiator Pressure Cap. SeeRadiator Pressure Cap
on page 5-24.
F. Engine Coolant Recovery Tank. SeeCooling System
on page 5-27.
G. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-34.
H. Electric Engine Cooling Fan. SeeCooling System on
page 5-27.
I. Engine Oil Fill Cap. See “When to Add Engine Oil”
underEngine Oil on page 5-13.
J. Engine Oil Dipstick. See “Checking Engine Oil”
underEngine Oil on page 5-13.
K. Automatic Transaxle Fluid Dipstick. See “Checking
the Fluid Level” underAutomatic Transaxle Fluid
on page 5-19.
L. Brake Fluid Reservoir. See “Brake Fluid” under
Brakes on page 5-36.
M. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-18.Engine Oil
Checking Engine Oil
It is a good idea to check your engine oil every time you
get fuel. In order to get an accurate reading, the oil
must be warm and the vehicle must be on level ground.
The engine oil dipstick handle is a yellow loop.
SeeEngine Compartment Overview on page 5-12for
the location of the engine oil dipstick.
Turn off the engine and give the oil several minutes to
drain back into the oil pan. If you don’t, the oil
dipstick might not show the actual level.
Pull out the dipstick and clean it with a paper towel or
cloth, then push it back in all the way. Remove it again,
keeping the tip down, and check the level.
5-13

Engine Air Cleaner/Filter
SeeEngine Compartment Overview on page 5-12
for the location of the engine air cleaner/lter.
When to Inspect the Engine
Air Cleaner/Filter
Inspect the air cleaner/lter at every oil change and
replace at the rst oil change after 25,000 miles
(40 000 km).
How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/lter remove the lter from
the vehicle and lightly shake the lter to release
loose dust and dirt. If the lter remains caked with dirt,
a new lter is required.To inspect or replace the engine air cleaner/lter,
do the following:
1. Loosen the screw and clamp on the air duct.
2. Lift the two clips
located on the top of
the lter assembly
to unlock the cover.
3. Disconnect the duct and reposition it while removing
the cover.
4. Inspect or replace the engine air cleaner/lter.
5. Reinstall the air duct and cover by reversing
Steps 1 to 3.
5-18

If the overheated engine warnings continue, there is
one more thing that can be done. Add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before this is done.
{CAUTION:
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly.
They are under pressure, and if you turn the
radiator pressure cap — even a little — they
can come out at high speed. Never turn the
cap when the cooling system, including the
radiator pressure cap, is hot. Wait for the
cooling system and radiator pressure cap to
cool if you ever have to turn the pressure cap.
How to Add Coolant to the Radiator
Notice:Your engine has a specic radiator ll
procedure. Failure to follow this procedure
could cause your engine to overheat and be
severely damaged.
Remove the radiator pressure cap when the cooling
system, including the radiator pressure cap and upper
radiator hose, is no longer hot.
1. Turn the pressure cap slowly counterclockwise to
its rst stop. Do not press down while turning the
pressure cap.
If a hiss is heard, wait for it to stop. A hiss means
there is still some pressure left.
5-30

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

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

Center High-Mounted
Stoplamp (CHMSL)
1. Open the trunk.
2. Reach through the access opening in the trunk lid.3. Remove the old bulb by turning it counterclockwise
one-quarter turn.
4. Push the new bulb into the bulb socket.
5. Turn the socket clockwise one-quarter turn
to reinstall.
5-49