Lexus LS460 Owners Book page 124

1-7. Safety information
SRS airbag deployment conditions (SRS front airbags and SRS seat cushion air-
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bag)
The SRS front airbags and SRS seat cushion airbag will deploy in the event of an
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impact that exceeds the set threshold level (the level of force corresponding to
an approximately 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.).
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, SRS seat
cushion airbag and the seat belt pretensioners may not activate together.
The SRS front passenger airbag will not activate if there is no passenger sitting
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in the front passenger seat. However, the front passenger airbag may deploy if
luggage is put in the seat, or the seat belt is fastened, even if the seat is unoccu-
pied. (P. 92)
Conditions under which the SRS airbags may deploy (inflate), other than a colli-
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sion (SRS front airbags and SRS seat cushion airbag)
The SRS front airbags and SRS seat cushion airbag may also deploy if a serious
impact occurs to the underside of your vehicle. Some examples are shown in the
illustration.
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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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