TOYOTA 2012 Matrix - Manual (Page 61)

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1-7. Safety information
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SRS airbag deployment conditions (SRS front airbags)
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The SRS front airbags will deploy in the event of an impact that exceeds
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 if the vehicle
strikes an object, such as a parked vehicle or sign pole, which can move or
deform on impact, or if the vehicle is involved in an underride collision (e.g.
a collision in which the front of the vehicle “underrides”, or goes under, the
bed of a truck, etc.).
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Depending on the type of collision, it is possible that only the seat belt
pretensioners will activate.
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The SRS front passenger airbag will not activate if there is no passenger
sitting in the front passenger seat. However, the front passenger airbag
may deploy if luggage is put in the seat, even if the seat is unoccupied.
(
→P. 85)
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SRS airbag deployment conditions (SRS side airbags and curtain
shield airbags)
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The SRS side airbags and curtain shield airbags will deploy in the event
of an 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]).
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The SRS curtain shield airbags may also deploy in the event of a severe
frontal collision.