GMC 2007 Acadia Owner's Manual page 82

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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.
In addition, your vehicle has dual-stage frontal
airbags. Dual-stage airbags adjust the restraint
according to crash severity. Your 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.
Seat-mounted side impact and roof-rail airbags are
intended to inflate in moderate to severe side
crashes. In addition, these roof-rail airbags
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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.