Toyota Yaris Manual page 33

Fastening the rear center seat belt
1 Take out the plate, and then pull
the seat belt.
2
Push the plate into the buckle in
the order of plate "A" and plate
"B" until a clicking sound is
heard.
1
Plate "A", buckle "A"
2
Plate "B", buckle "B"
YARIS_F_WE_52F20E
1-1. For safe use
Plate "A"
Buckle "A"
33
1
Plate "B"
Buckle "B"