Lexus ES-300 2001 Manual page 211

COMFORT ADJUSTMENT
CAUTION
D After inserting the tab, make sure the tab and buckle
are locked and that the lap and shoulder portions of
the belt are not twisted.
D Do not insert coins, clips, etc. in the buckle as this
may prevent you from properly latching the tab and
buckle.
D If the seat belt does not function normally,
immediately contact your Lexus dealer. Do not use
the seat until the seat belt is fixed. It cannot protect
your child from injury.
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2. Fully extend the shoulder belt to put it in the lock
mode. When the belt is then retracted slightly, it cannot
be extended.
To hold the convertible seat securely, make sure the belt
is in the lock mode before letting the belt retract.