Lexus ES300 Owner's Manual page 134

COMFORT ADJUSTMENT
CAUTION
The SRS curtain shield airbags inflate with considerable
force. To avoid potential death or serious injury when
they inflate, the driver, front passenger and rear outside
passengers must:
D Wear their seat belts properly.
D Remain properly seated with their back upright and
against the seat at all times.
120
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 seat belt pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources. (For details, see
"Service reminder indicators and warning buzzers" on page 50
for instructions.)