What Makes An Airbag Inflate - GMC Savana 2011 Owner's Manual

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 may or may not have
roof-rail airbags. See Airbag System
on page 3 24. 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. 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.
Roof-rail airbags are not intended to
inflate in frontal impacts, near-frontal
impacts, or rear impacts. All roof-rail
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 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.
I n f o r ma t i o n P r o v i d e d b y :
Seats and Restraints
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
roof-rail airbags, there are airbag
modules in the ceiling of the vehicle,
near the side windows for the first,
second, and third rows (if equipped).
See Where Are the Airbags? on
page 3 26 for more information.
3-29