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caution - GM Canada

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In addition, the vehicle may have dual-stage frontal<br />

airbags. Dual-stage airbags adjust the restraint<br />

according to crash severity. The vehicle has electronic<br />

frontal sensors, which help the sensing system<br />

distinguish between a moderate frontal impact and a<br />

more severe frontal impact. For moderate frontal<br />

impacts, dual-stage airbags inflate at a level less than<br />

full deployment. For more severe frontal impacts,<br />

full deployment occurs.<br />

The vehicle may or may not have roof-rail airbags.<br />

See Airbag System on page 1-58. Roof-rail airbags are<br />

intended to inflate in moderate to severe side crashes.<br />

In addition, these roof-rail airbags are intended to inflate<br />

during a rollover. Roof-rail airbags will inflate if the<br />

crash severity is above the system’s designed threshold<br />

level. The threshold level can vary with specific<br />

vehicle design.<br />

Roof-rail airbags are not intended to inflate in frontal<br />

impacts, near-frontal impacts, or rear impacts. All roof-rail<br />

airbags will deploy when either side of the vehicle is<br />

struck.<br />

In any particular crash, no one can say whether an<br />

airbag should have inflated simply because of the<br />

damage to a vehicle or because of what the repair costs<br />

were. For frontal airbags, inflation is determined by what<br />

the vehicle hits, the angle of the impact, and how quickly<br />

the vehicle slows down. For roof-rail airbags, deployment<br />

is determined by the location and severity of the side<br />

impact.<br />

What Makes an Airbag Inflate?<br />

In a deployment event, the sensing system sends an<br />

electrical signal triggering a release of gas from the<br />

inflator. Gas from the inflator fills the airbag causing the<br />

bag to break out of the cover and deploy. The inflator, the<br />

airbag, and related hardware are all part of the airbag<br />

module.<br />

Frontal airbag modules are located inside the steering<br />

wheel and instrument panel. For vehicles with roof-rail<br />

airbags, there are airbag modules in the ceiling of the<br />

vehicle, near the side windows for the first, second, and<br />

third rows (if equipped). See Where Are the Airbags? on<br />

page 1-60 for more information.<br />

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