Lexus 2003 LS Owner's Manual page 63

(b) Driver's Seat Belt Reminder Light and
Buzzer
This light and buzzer remind you to buckle up the driver's seat
belt.
Once the ignition switch is turned to "ON" or "START", the
reminder light flashes and buzzer sounds if the driver's seat
belt is not fastened. Unless the driver fastens the belt, the light
stays flashing and the buzzer stops after about 4 to 8 seconds.
(c) Front Passenger's Seat Belt Reminder
Light
This light reminds you to buckle up the front passenger's seat
belt.
Once the ignition switch is turned to "ON" or "START", the
reminder light flashes if a passenger sits in the front passenger
seat and does not fasten the seat belt. Unless the front
passenger fastens the belt, the light stays flashing. However,
if a front passenger uses a seat cushion or the like, the
indicator may not flash even when the seat belt is not buckled
up.
If luggage load is placed on the front passenger seat,
depending on its weight and how it is placed on the seat, the
built–in sensor in the seat cushion may detect the pressure,
causing the reminder light to flash.
GAUGES, METERS AND SERVICE REMINDER INDICATORS
(d) SRS Warning Light
The indicators come on when the ignition switch is turned
to the "ON" position. It goes off after about 6 seconds.
This means the SRS airbags and seat belt pretensioners
are operating properly.
The SRS warning light system monitors the airbag sensor
assembly, front airbag sensors, side and curtain shield airbag
sensors, occupant detection sensor, seat belt buckle switch,
seat belt pretensioner assemblies, inflators, warning light,
interconnecting wiring and power sources.
If either of the following conditions occurs, this indicates a
malfunction somewhere in the parts monitored by the warning
light system. Contact your Lexus dealer as soon as possible
to service the vehicle.
A When the ignition switch is turned to the "ON" position, the
light does not come on, remains on or flashes.
A The light comes on or starts flashing while driving.
If the light stays on, it indicates that the front airbags have a
problem. If the light flashes, the side and curtain shield airbags
and/or seat belt pretensioners have a problem.
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