Toyota Lexusc Owner's Handbook Manual page 207

OCCUPANT RESTRAINT SYSTEMS
This indicator comes on when the ignition key is turned to
the "ON" position. It goes off after about 6 seconds. This
means the front seat belt pretensioners 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.)
188
If any of the following conditions occurs, this indicates a
malfunction of the 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, remains on or flashes.
D The light comes on or starts flashing while driving.
D If either front seat belt does not retract or cannot be pulled
out due to a malfunction or activation of the relevant front
seat belt pretensioner.
D The seat belt pretensioner assembly or surrounding area
has been damaged.