Lexus GX470 2004 Owner's Manual page 181

OCCUPANT RESTRAINT SYSTEMS
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 front 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 seat belt pretensioner assemblies, inflators, warning light,
"RSCA OFF" indicator light, interconnecting wiring and power
sources. (For details, see "Service reminder indicators and
warning buzzers" on page 57 for instructions.)
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.
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If the light stays on, it indicates that the SRS front airbags have
a problem. If the light flashes, the SRS side and curtain shield
airbags have a problem.