Chevrolet 2000 Express Van Owner's Manual page 42

CAUTION:
If something is between an occupant and an air
bag, the bag might not inflate properly or it
might force the object into that person. The path
of an inflating 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.
When should an air bag inflate?
An air bag is designed to inflate in a moderate to severe
-
frontal or near frontal crash. The air bag will 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 air bag
is not designed to inflate in rollovers, side impacts or rear
impacts, because inflation would not help the occupant.
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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.
Inflation is determined by the angle of the impact and
how quickly the vehicle slows down in frontal or
-
near frontal impacts.
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. 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 and in the instrument panel in front of the
right front passenger.
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