Lexus SC 430 2002 Manual page 132

COMFORT ADJUSTMENT
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The front airbag system is designed to activate in
response to a severe frontal impact within the shaded area
between the arrows in the illustration.
The front airbags will work if the severity of the impact is above
the designed threshold level, comparable to an approximate
25 km/h (15 mph) collision when impacting straight into a fixed
barrier that does not move or deform.
If the severity of the impact is below the above threshold level,
the front airbags may not work.
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 it is involved
in an underride collision (a collision in which the nose of the
vehicle "underrides", or goes under, the bed of a truck, etc.).
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It is possible that in some collisions at the lower zone of airbag
sensor detection and activation, the SRS airbags and seat belt
pretensioners will not operate all together.
For the safety of all occupants, always wear your seat belts
properly.
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" 1 Collision from the rear
2 Vehicle rollover
The front airbags are not designed to inflate if the vehicle
is involved in a rear collision, if it rolls over, or if it is
involved in a low−speed frontal collision.
The side airbags are designed to inflate when the
passenger compartment area suffers a severe impact
from the side.