Lexus LFA Owner's Manual page 67

SRS airbag deployment conditions
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The SRS front airbags will deploy in the event of an impact that exceeds the
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set threshold level (the level of force corresponding to a 12 - 18 mph [20 - 30
km/h] frontal collision with a fixed wall that does not move or deform). In addi-
tion, the SRS seat belt airbags will also deploy in the event of an impact that
exceeds the set threshold level (the level of force corresponding to the impact
force produced by an approximately 3300 lb. [1500 kg] vehicle colliding with
the vehicle cabin from a direction perpendicular to the vehicle orientation at an
approximate speed of 12 - 18 mph [20 - 30 km/h]).
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.).
It is possible that in some collisions where the forward deceleration of the vehi-
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cle is very close to the designed threshold level, the SRS front airbags and the
seat belt pretensioners may not activate together.
The SRS passenger airbag will not activate if there is no passenger sitting in the
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passenger seat. However, the passenger airbag may deploy if luggage is put in
the seat, or the seat belt is fastened, even if the seat is unoccupied. (P. 72)
Conditions under which the SRS airbags may deploy (inflate), other than a colli-
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sion
The SRS front airbags may also deploy if a serious impact occurs to the underside of
your vehicle. Some examples are shown in the illustration.
Hitting a curb, edge of pavement or hard
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surface
Falling into or jumping over a deep hole
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Landing hard or vehicle falling
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1-7. Safety information
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