Lexus ES330 2005 Owner's Manual page 146

If any of the following conditions occurs, this indicates a
malfunction of the airbags or seat belt pretensioners. Contact
your Lexus dealer as soon as possible.
D The light does not come on when the ignition key is turned
to the "ON" position or remains on for more than 6 seconds.
D The light comes on while driving.
The SRS warning light and "AIRBAG OFF" indicator light will
be illuminated if there is a malfunction in the front passenger
occupant classification system.
OCCUPANT RESTRAINT SYSTEM
In the following cases, contact your Lexus dealer as soon as
possible:
D The SRS front airbags have been inflated.
D The front of the vehicle (shaded in the illustration) was
involved in an accident that was not severe enough to cause
the SRS front airbags to inflate.
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