Lexus ES300 Owner's Manual page 156

COMFORT ADJUSTMENT
D If the driver's seat position does not allow sufficient
space for safe installation, install the child restraint
system on the rear right seat.
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1. Run the lap and shoulder belt through or around the
convertible seat following the instructions provided by its
manufacturer and inserting the tab into the buckle taking care
not to twist the belt. Keep the lap portion of the belt tight.
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 child restraint system until the seat belt is fixed.
It cannot protect your child from injury.