Lexus 2003 LS Owner's Manual page 149

16L330b
This indicator comes on when the ignition switch is turned
to the "ON" position. It goes off after about 6 seconds.
This means the seat belt pretensioners are operating
properly.
This 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. (For details, see
"Service reminder indicators and warning buzzers" on page
46.)
COMFORT ADJUSTMENT
16L331d

1 SRS warning light
2 Front seat belt pretensioner assembly
3 Airbag sensor assembly
4 Rear seat belt pretensioner assembly
5 Front airbag sensors
6 Occupant detection sensor
7 Seat belt buckle switch
The seat belt pretensioner system mainly consists of the
above components, and their locations are shown in the
illustration.
The seat belt pretensioners are controlled by the airbag sensor
assembly. The airbag sensor assembly consists of a safing
sensor and airbag sensor.
When the seat belt pretensioners are activated, an operating
noise may be heard and a small amount of smoke–like gas
may be released. This gas is harmless and does not indicate
that a fire is occurring.
Once the seat belt pretensioners have been activated, the seat
belt retractors remain locked.
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