Lexus GS300 1998 Owner's Manual page 147

COMFORT ADJUSTMENT
CAUTION
D After inserting the tab, make sure the tab and buckle are
locked and that the belt is 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 an adult occupant or your
child from injury.
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