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In addition, the vehicle has
dual-stage frontal airbags.
Dual-stage airbags adjust the
restraint according to crash severity.
The vehicle has electronic frontal
sensors, which help the sensing
system distinguish between a
moderate frontal impact and a more
severe frontal impact. For moderate
frontal impacts, dual-stage airbags
inflate at a level less than full
deployment. For more severe frontal
impacts, full deployment occurs.
The vehicle has seat-mounted side
impact and roof-rail airbags. See
Airbag System on page 1-47.
Seat-mounted side impact and
roof-rail airbags are intended
to inflate in moderate to severe side
crashes. In addition, these roof-rail
airbags are intended to inflate during
a rollover or in a severe frontal
impact. Seat-mounted side impact
and roof-rail airbags will inflate if the
crash severity is above the
system’s designed threshold level.
The threshold level can vary
with specific vehicle design.
Seat-mounted side impact airbags
are not intended to inflate in
frontal impacts, near-frontal impacts,
rollovers, or rear impacts. Roof-rail
airbags are not intended to inflate in
rear impacts. A seat-mounted
side impact airbag is intended to
deploy on the side of the vehicle that
is struck. Both roof-rail airbags
will deploy when either side of the
vehicle is struck, or if the sensing
system predicts that the vehicle
is about to roll over, or in a severe
frontal impact.
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
seat-mounted side impact and
roof-rail airbags, deployment
is determined by the location and
severity of the side impact. In
a rollover event, roof-rail airbag
deployment is determined by
the direction of the roll.
What Makes an Airbag
Inflate?
In a deployment event, the sensing
system sends an electrical signal
triggering a release of gas from the
inflator. Gas from the inflator fills the
airbag causing the bag to break out
of the cover and deploy. The inflator,
the airbag, and related hardware are
all part of the airbag module.
Frontal airbag modules are located
inside the steering wheel and
instrument panel. For vehicles with
seat-mounted side impact airbags,
there are airbag modules in the side
of the front seatbacks closest to
the door. For vehicles with roof-rail
airbags, there are airbag modules
in the ceiling of the vehicle, near the
side windows that have occupant
seating positions.
1-52 Seats and Restraint System