What Makes An Airbag - Chevrolet 2013 Express Owner's Manual

3-22 Seats and Restraints
Thresholds can also vary with
specific vehicle design.
Frontal airbags are not intended to
inflate during vehicle rollovers, rear
impacts, or in many side impacts.
Single Stage vs. Dual Stage
Airbags
Depending on the weight of the
vehicle, you will have either Single
Stage Airbags or Dual Stage
Airbags. Vehicles that have a
passenger sensing system also
have dual stage airbags. See
Passenger Airbag Status Indicator
on page 5 18 or Passenger Sensing
System on page 3 28.
If the GVWR (Gross Vehicle Weight
Rating) of the vehicle is 3 855 kg
(8,500 lb) or above, the vehicle may
have single stage airbags. If the
GVWR is below 3 855 kg (8,500 lb)
then the vehicle may have dual
stage airbags. You can find the
GVWR on the certification label on
the rear edge of the driver door. See
Vehicle Load Limits on page 9 10
for more information.
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 17. 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.

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.