Lexus 2003 LS Owner's Manual page 153

CAUTION
The side airbags inflate with considerable force. To
avoid potential death or serious injury when they inflate,
the driver and front passenger must:
A Wear their seat belts properly.
A Remain properly seated with their back upright and
against the seat at all times.
COMFORT ADJUSTMENT
16L355a

Curtain shield airbags for front and rear outside
occupants
In response to a severe side impact, the curtain shield
airbag on either side works together with the seat belts by
inflating. The curtain shield airbags help to reduce
injuries mainly to the driver's head, front passenger's
head and rear outside passenger's head.
The curtain shield airbag is activated even with no passenger
in the front seat or rear seat.
Your vehicle is equipped with a crash sensing and diagnostic
module, which will record the use of the seat belt restraint
system by the driver and passenger when the curtain shield
airbags are inflated.
Be sure to wear your seat belt properly.
139