Toyota Lexusc Owner's Handbook Manual page 202

D Make sure the "AIRBAG OFF" indicator light is not
illuminated when using the seat belt extender for the
front passenger seat. If the "AIRBAG OFF" indicator
light is illuminated, disconnect the extender tongue
from the seat belt buckle, then reconnect the seat
belt. Reconnect the seat belt extender after making
sure the "AIRBAG OFF" indicator light is not
illuminated. If you use the seat belt extender while
the "AIRBAG OFF" indicator light is illuminated, the
front passenger airbag and side airbag on the front
passenger side may not activate correctly, which
could cause death or serious injury in the event of
collision.
D Be sure to wear the seat belt without the seat belt
extender if you can fasten the seat belt without the
extender.
D Do not use the seat belt extender when installing a
child restraint system on the front or rear passenger
seat. If installing a child restraint system with the
seat belt extender connected to the seat belt, the seat
belt will not securely hold the child restraint system,
which could cause death or serious injury to the child
or other passengers in the event of collision.
OCCUPANT RESTRAINT SYSTEMS
To connect the extender to the seat belt, insert the tab into
the seat belt buckle so that the "PRESS" signs on the
buckle release buttons of the extender and the seat belt
are both facing outward as shown.
You will hear a click when the tab locks into the buckle.
When releasing the seat belt, press on the buckle release
button on the extender, not on the seat belt. This helps prevent
damage to the vehicle interior and extender itself.
As far as the seat belt extender on the front passenger side is
concerned, ba sure to disconnect the extender from the seat
belt after the above operation in order to activate the front
passenger airbag correctly when getting into the vehicle next
time.
When not in use, remove the extender and store in the vehicle
for future use.
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