Side impact airbags are intended to inflate in
moderate to severe side crashes. A side impact
airbag 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 airbags are not intended to
inflate in frontal or near-frontal impacts, rollovers,
or rear impacts. Both roof-mounted side impact
airbags will deploy when either side of the vehicle
is struck.
In any particular crash, no one can say whether
an airbag should have inflated simply because
of the damage to a vehicle or because of what the
repair costs were. For frontal airbags, inflation is
determined by what the vehicle hits, the angle
of the impact, and how quickly the vehicle slows
down. For side impact airbags, inflation is
determined by the location and severity of the
impact.
What Makes an Airbag Inflate?
In an impact of sufficient severity, the airbag
sensing system detects that the vehicle is
in a crash. The sensing system triggers a release
of gas from the inflator, which inflates the
airbag. The inflator, airbag and related hardware
are all part of the airbag modules. Frontal
airbag modules are located inside the steering
wheel and the instrument panel. For vehicles with
seat-mounted side impact airbags, there are
also airbag modules in the side of the front
seatbacks closest to the door. For vehicles with
roof-mounted side impact airbags, there are
also airbag modules in the ceiling of the vehicle,
near the side window.
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