GMC 2012 Sierra Denali Owner's Manual page 76

3-24 Seats and Restraints
Frontal airbags may inflate at
different crash speeds. For
example:
If the vehicle hits a stationary
object, the airbags could inflate
at a different crash speed than if
the vehicle hits a moving object.
If the vehicle hits an object that
deforms, the airbags could
inflate at a different crash speed
than if the vehicle hits an object
that does not deform.
If the vehicle hits a narrow object
(like a pole), the airbags could
inflate at a different crash speed
than if the vehicle hits a wide
object (like a wall).
If the vehicle goes into an object
at an angle, the airbags could
inflate at a different crash speed
than if the vehicle goes straight
into the object.
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.
If the GVWR (Gross Vehicle Weight
Rating) of your vehicle is 3 855 kg
(8,500 lb) or above, the vehicle has
single stage airbags. If the GVWR is
below 3 855 kg (8,500 lb) then the
vehicle has dual stage airbags.
Vehicles with a full bench seat are
equipped with single state 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 16 for more
information.
The vehicle may have 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.
Vehicles with dual stage airbags
also have a seat position sensor
which enables the sensing system
to monitor the position of the driver
seat (all models) and the right front
passenger seat (light-duty models
only). The seat position sensor
provides information that is used to
determine if the airbags should
deploy at a reduced level or at full
deployment.
The vehicle may have seat mounted
side impact airbags. The
vehicle has roof-rail airbags. See
Airbag System on page 3 20.
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