Lexus RX300 Manual page 93

COMFORT ADJUSTMENT
Folding down rear seatbacks
16R096a
"Before folding down rear seatbacks
Stow the rear seat belt buckle and center seat belt as shown in the
illustration.
This prevents the belts from falling out when you fold up the rear
seats.
78
16R099
"Seat belt hanger
For the outer seat belts, use the seat belt hangers to prevent the
belts from being tangled.
NOTICE
The seat belt buckle and center seat belt must be stowed before
you fold down the rear seatbacks.