Lexus 2003 LS Owner's Manual page 154

COMFORT ADJUSTMENT
CAUTION
The curtain shield airbags inflate with considerable
force. To avoid potential death or serious injury when
they inflate, the driver, front passenger and rear outside
passenger must:
A Wear their seat belts properly.
A Remain properly seated with their back upright and
against the seat at all times.
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16L330b
The 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 and curtain shield airbag
sensors, occupant detection sensor, seat belt buckle switch,
seat belt pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
"Service reminder indicators and warning buzzers" on page
46.)
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.