Buick 1995 Century Owner's Manual page 34

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
the vehicle's deceleration. Vehicle damage is only one
indication of this.
What makes an air bag inflate?
In a frontal or near-frontal impact of sufficient severity,
the air bag sensing system detects that the vehicle is
suddenly stopping as a result of a crash. The sensing
system triggers a chemical reaction of the sodium azide
sealed in the inflator. The reaction produces nitrogen
gas, which inflates the air bag. The inflator, air bag, and
related hardware are all part of the air bag module
packed inside the steering wheel.
How does an air bag restrain?
In
moderate to severe frontal or near-frontal collisions,
even belted occupants can contact the steering wheel.
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 air bags would not
help you in many types of collisions, including rollovers
and rear and side impacts, primarily because an
occupant's motion is not toward the 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.
What will you see after an air bag inflates?
After the air bag inflates, it quickly deflates. This occurs
so quickly that some people may not even realize the air
bag inflated. Some components of the air bag module in
the steering wheel hub will be hot for a short time, but
the part of the bag that comes into contact with you will
not be hot to the touch. There will be some smoke and
dust coming from vents in the deflated air bag. Air bag
inflation will not prevent the driver from seeing or from
being able to steer the vehicle, nor will it stop people
from leaving the vehicle.
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