BUICK CENTURY 2003 Repair Manual

{CAUTION:
Anyone who is up against, or very close to,
any air bag when it in¯ates can be seriously
injured or killed. Air bags plus lap-shoulder
belts offer the best protection for adults, but
not for young children and infants. Neither the
vehicle's safety belt system nor its air bag
system is designed for them. Young children
and infants need the protection that a child
restraint system can provide. Always secure
children properly in your vehicle. To read how,
see the part of this manual called ªOlder
Childrenº or ªInfants and Young Children.ºThere is an air bag
readiness light on the
instrument panel, which
shows the air bag symbol.
The system checks the air bag electrical system for
malfunctions. The light tells you if there is an electrical
problem. See
Air Bag Readiness Light on page 3-25for more information.
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Where Are the Air Bags?The driver's frontal air bag is in the middle of the
steering wheel.
The right front passenger's frontal air bag is in the
instrument panel on the passenger's side.
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If your vehicle has one, the driver's side impact air bag is
in the side of the driver's seatback closest to the door.
{CAUTION:
If something is between an occupant and an
air bag, the bag might not in¯ate properly or it
might force the object into that person causing
severe injury or even death. The path of an
in¯ating air bag must be kept clear. Don't put
anything between an occupant and an air bag,
and don't attach or put anything on the
steering wheel hub or on or near any other air
bag covering. Don't let seat covers block the
in¯ation path of a side impact air bag.
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When Should an Air Bag In¯ate?
The driver's and right front passenger's frontal air bags
are designed to in¯ate in moderate to severe frontal
or near-frontal crashes. But they are designed to in¯ate
only if the impact speed is above the system's
designed ªthreshold level.º
If the front of your vehicle goes straight into a wall that
does not move or deform, the threshold level is
about 12 to 18 mph (19 to 29 km/h). The threshold level
can vary, however, with speci®c vehicle design, so
that it can be somewhat above or below this range.
If your vehicle strikes something that will move or
deform, such as a parked car, the threshold level will be
higher. The driver's and right front passenger's frontal
air bags are not designed to in¯ate in rollovers, rear
impacts, or in many side impacts because in¯ation
would not help the occupant.Your vehicle may or may not have a side impact air
bag. See
Air Bag Systems on page 1-53. A driver 's side
impact air bag is designed to in¯ate in moderate to
severe side crashes involving the driver's door. A side
impact air bag will in¯ate if the crash severity is
above the system's designed ªthreshold level.º The
threshold level can vary with speci®c vehicle design.
A driver's side impact air bag is not designed to in¯ate
in frontal or near-frontal impacts, rollovers or rear
impacts, because in¯ation would not help the occupant.
In any particular crash, no one can say whether an
air bag should have in¯ated simply because of
the damage to a vehicle or because of what the repair
costs were. For frontal air bags, in¯ation is determined
by the angle of the impact and how quickly the
vehicle slows down in frontal and near-frontal impacts.
For side impact air bags, in¯ation is determined by
the location and severity of the impact.
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What Makes an Air Bag In¯ate?
In an impact of sufficient severity, the air bag sensing
system detects that the vehicle is in a crash. For
both the frontal and side impact air bags, the sensing
system triggers a release of gas from the in¯ator, which
in¯ates the air bag. The in¯ator, air bag and related
hardware are all part of the air bag modules. Frontal air
bag modules are located inside the steering wheel
and instrument panel. For vehicles with a driver's side
impact air bag, the air bag moules are located in
the seatback closest to the driver's door.
How Does an Air Bag Restrain?
In moderate to severe frontal or near frontal collisions,
even belted occupants can contact the steering wheel or
the instrument panel. In moderate to severe side
collisions, even belted occupants can contact the inside
of the vehicle. The air bag supplements the protection
provided by safety belts. Air bags distribute the force of
the impact more evenly over the occupant's upper
body, stopping the occupant more gradually. But thefrontal air bags would not help you in many types of
collisions, including rollovers, rear impacts, and
many side impacts, primarily because an occupant's
motion is not toward the air bag. A side impact air bag
would not help you in many types of collisions,
including frontal or near frontal collisions, rollovers, and
rear impacts, primarily because an occupant's motion
is not toward that air bag. Air bags should never
be regarded as anything more than a supplement to
safety belts, and then only in moderate to severe frontal
or near-frontal collisions for the driver's and right front
passenger's frontal air bags, and only in moderate
to severe side collisions for vehicles with a driver's side
impact air bag.
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What Will You See After an Air Bag
In¯ates?
After the air bag in¯ates, it quickly de¯ates, so quickly
that some people may not even realize the air bag
in¯ated. Some components of the air bag module ± the
steering wheel hub for the driver's air bag, the
instrument panel for the right front passenger's bag, the
side of the seatback closest to the door for the driver's
side impact air bag ± will be hot for a short time.
The parts of the bag that come into contact with you
may be warm, but not too hot to touch. There will
be some smoke and dust coming from the vents in the
de¯ated air bags. Air bag in¯ation doesn't prevent
the driver from seeing or being able to steer the vehicle,
nor does it stop people from leaving the vehicle.
{CAUTION:
When an air bag in¯ates, there is dust in the
air. This dust could cause breathing problems
for people with a history of asthma or other
breathing trouble. To avoid this, everyone in
the vehicle should get out as soon as it is safe
to do so. If you have breathing problems but
can't get out of the vehicle after an air bag
in¯ates, then get fresh air by opening a
window or a door. If you experience breathing
problems following an air bag deployment, you
should seek medical attention.
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In many crashes severe enough to in¯ate an air bag,
windshields are broken by vehicle deformation.
Additional windshield breakage may also occur from the
right front passenger air bag.
·Air bags are designed to in¯ate only once. After an
air bag in¯ates, you'll need some new parts for
your air bag system. If you don't get them, the air
bag system won't be there to help protect you
in another crash. A new system will include air bag
modules and possibly other parts. The service
manual for your vehicle covers the need to replace
other parts.
·Your vehicle is equipped with a crash sensing and
diagnostic module, which records information
about the frontal air bag system. The module
records information about the readiness of the
system, when the system commands air bag
in¯ation and driver's safety belt usage at
deployment. The module also records speed,
engine RPM, brake and throttle data.
·Let only quali®ed technicians work on your air bag
systems. Improper service can mean that an air
bag system won't work properly. See your dealer for
service.
Notice:If you damage the covering for the driver's
or the right front passenger's air bag, or the air
bag covering on the driver's seatback, the bag may
not work properly. You may have to replace the
air bag module in the steering wheel, both the air
bag module and the instrument panel for the
right front passenger's air bag, or the air bag
module and seatback for the driver's side impact air
bag. Do not open or break the air bag coverings.
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Servicing Your Air Bag-Equipped
Vehicle
Air bags affect how your vehicle should be serviced.
There are parts of the air bag systems in several places
around your vehicle. Your dealer and the service manual
have information about servicing your vehicle and the air
bag systems. To purchase a service manual, see
Service
Publications Ordering Information on page 7-11.
{CAUTION:
For up to 10 seconds after the ignition key is
turned off and the battery is disconnected, an
air bag can still in¯ate during improper
service. You can be injured if you are close to
an air bag when it in¯ates. Avoid yellow
connectors. They are probably part of the air
bag system. Be sure to follow proper service
procedures, and make sure the person
performing work for you is quali®ed to do so.
The air bag systems do not need regular maintenance.
1-62

Restraint System Check
Checking Your Restraint Systems
Now and then, make sure the safety belt reminder light
and all your belts, buckles, latch plates, retractors
and anchorages are working properly. Look for any other
loose or damaged safety belt system parts. If you see
anything that might keep a safety belt system from doing
its job, have it repaired.
Torn or frayed safety belts may not protect you in a
crash. They can rip apart under impact forces. If a belt
is torn or frayed, get a new one right away.
Also look for any opened or broken air bag covers, and
have them repaired or replaced. (The air bag system
does not need regular maintenance.)
Replacing Restraint System Parts
After a Crash
{CAUTION:
A crash can damage the restraint systems in
your vehicle. A damaged restraint system may
not properly protect the person using it,
resulting in serious injury or even death in a
crash. To help make sure your restraint
systems are working properly after a crash,
have them inspected and any necessary
replacements made as soon as possible.
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If you've had a crash, do you need new belts or LATCH
system parts?
After a very minor collision, nothing may be necessary.
But if the belts were stretched, as they would be if worn
during a more severe crash, then you need new parts.
If the LATCH system was being used during a more
severe crash, you may need new LATCH system parts.If belts are cut or damaged, replace them. Collision
damage also may mean you will need to have LATCH
system, safety belt or seat parts repaired or replaced.
New parts and repairs may be necessary even if the belt
or LATCH system wasn't being used at the time of
the collision.
If an air bag in¯ates, you'll need to replace air bag
system parts. See the part on the air bag system earlier
in this section.
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