Toyota Lexusc Owner's Handbook Manual page 220

The indicator comes on when the ignition key 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
sensor assemblies, curtain shield airbag sensor assemblies,
driver's seat position sensor, driver's seat belt buckle switch,
front passenger occupant classification system, "AIRBAG
OFF" indicator light, front passenger's 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
87.)
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 When the ignition key is turned to the "ON" position, the light
does not come on, remains on or flashes.
D The light comes on or starts flashing while driving.
OCCUPANT RESTRAINT SYSTEMS
If the light stays on, it indicates that the SRS driver and front
passenger airbags and/or front
classification system and the "AIRBAG OFF" indicator light fail.
If the light flashes, the SRS side and curtain shield airbags
have a problem.
passenger occupant
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