Lexus 2004 LS430 Owner's Manual page 217

OCCUPANT RESTRAINT SYSTEMS
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 switch is turned to the "ON" position, the
light does not come on or remains on.
D The light comes on while driving.
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