Toyota 2013 Rav4 Owner's Manual page 12

Fastening the seat belt (for the rear center seat)
1
Press the plate to release, 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"
RAV4_OM_OM42809U_(U)
1-1. For safe use
Plate "B"
Buckle "B"
31
1
Plate "A"
Buckle "A"