Buick 2000 LeSabre Owner's Manual page 32

When should an air bag inflate?
The driver's and right front passenger's frontal air bags
are designed to inflate in moderate to severe frontal or
-
near frontal crashes. The frontal air bags are designed to
inflate only if the impact speed is above the system's
designed "threshold level." If your vehicle goes straight
into a wall that doesn't move or deform, the threshold
level is about 11 to 16 mph (18 to 26 km/h). The
threshold level can vary, however, with specific 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 inflate in rollovers,
side impacts, or rear impacts, because inflation would
not help the occupant.
The side impact air bags are designed to inflate in
moderate to severe side crashes involving a front door.
A side impact air bag will inflate if the crash severity is
above the system's designed "threshold level." The
threshold level can vary with specific vehicle design.
Side impact air bags are not designed to inflate in frontal
-
or near frontal impacts, rollovers or rear impacts,
because inflation would not help the occupant. A side
impact air bag will only deploy on the side of the
vehicle that is struck.
In any particular crash, no one can say whether an air
bag should have inflated simply because of the damage
to a vehicle or because of what the repair costs were. For
frontal air bags, inflation 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, inflation is determined by the location of the
impact and how quickly the side of the vehicle deforms.
What makes an air bag inflate?
In an impact of sufficient severity, the air bag sensing
system detects that the vehicle is in a crash. For both
frontal and side impact air bags, the sensing system
triggers a release of gas from the inflator, which inflates
the air bag. The inflator, air bag and related hardware
are all part of the air bag modules inside the steering
wheel, instrument panel and the side of the front
seatbacks closest to the door.
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