Toyota PRUS V 2020 Owner's Manual page 35

Fastening the seat belt (second center seat)
Press the plate to release, and
1
pull out the seat belt.
Connect by inserting plate B
2
into buckle B until a click sound
is heard.
Secure the belt by inserting
3
plate A into buckle A until a
click sound is heard.
1-1. For safe use
Plate B
Buckle B
Plate A
Buckle A
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1