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When Should an Airbag Inflate?
Airbags are designed to inflate in moderate to
severe frontal or near-frontal crashes. But they are
designed to inflate only if the impact exceeds a
predetermined deployment threshold. Deployment
thresholds take into account a variety of desired
deployment and non-deployment events and
are used to predict how severe a crash is likely to
be in time for the airbags to inflate and help
restrain the occupants. Whether your frontal
airbags will or should deploy is not based on how
fast your vehicle is traveling. It depends largely
on what you hit, the direction of the impact,
and how quickly your vehicle slows down.
In addition, your vehicle has “dual stage” frontal
airbags, which 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, these airbags inflate at a level less
than full deployment. For more severe frontal
impacts, full deployment occurs. If the front of
your vehicle goes straight into a wall that does
not move or deform, the threshold level for
the reduced deployment is about 12 to 16 mph
(19 to 26 km/h), and the threshold level for a
full deployment is about 18 to 22 mph (28.9 to
35.4 km/h). The threshold level can vary, however,
with specific vehicle design, so that it can be
somewhat above or below this range.
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.
Frontal airbags are not intended to inflate during
vehicle rollovers, rear impacts, or in many
side impacts.
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