Toyota Sienna2013 Owner's Manual page 150

SRS airbag deployment conditions (SRS front airbags)
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The SRS front airbag will deploy in the event of an impact that exceeds
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the set threshold level (the level of force corresponding to an approxi-
mately 12 - 18 mph [20 - 30 km/h] frontal collision with a fixed wall that
does not move or deform).
However, this threshold velocity will be considerably higher in the following
situations:
• If the vehicle strikes an object, such as a parked vehicle or sign pole,
which can move or deform on impact
• If the vehicle is involved in an underride collision, such as a collision in
which the front of the vehicle "underrides", or goes under, the bed of a
truck
Depending on the type of collision, it is possible that only the seat belt
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pretensioners will activate.
The SRS front airbags for the front passenger will not activate if there is
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no passenger sitting in the front passenger seat. However, the SRS front
airbags for the front passenger may deploy if luggage is put in the seat,
even if the seat is unoccupied.
SRS airbag deployment conditions (SRS side and curtain shield air-
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bags)
The SRS side and curtain shield airbags will deploy in the event of an
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impact that exceeds the set threshold level (the level of force corre-
sponding to the impact force produced by an approximately 3300 lb.
[1500 kg] vehicle colliding with the vehicle cabin from a direction perpen-
dicular to the vehicle orientation at an approximate speed of 12 - 18 mph
[20 - 30 km/h]).
The SRS curtain shield airbags may also deploy in the event of a severe
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frontal collision.
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