Lexus 2003 SC430 Owner's Manual page 132

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This indicator comes on when the ignition switch is turned
to the "ON" position. It goes off after about 6 seconds.
This means the SRS airbags are operating properly.
This warning light system monitors the airbag sensor
assembly, front airbag sensors, side airbag sensors, occupant
detection sensor, seat belt buckle switch, front seat belt
pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
"Service reminder indicators and warning buzzers" on page
38.)
The front airbags are designed to deploy in severe
(usually frontal) collisions where the magnitude and
duration of the forward deceleration of the vehicle
exceeds the designed threshold level.
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 the vehicle has the impact
straight into a fixed barrier 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 (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 vehicle is very close to the designed
threshold level, the front airbags and the seat belt
pretensioners may not activate together.
For the safety of all occupants, always wear your seat belts
properly.
2003 SC430 from May '03 Prod. (OM24449U)
COMFORT ADJUSTMENT
115