The contact owns a 2015 Toyota Rav4. The contact stated that while using the rear seat belts, the occupant was unable to adjust the straps, and while moving in the seats, the seat belt straps erroneously became tighter. The contact stated that the failure was present with the rear driver’s side seat belt and rear passengers side seat belt. The cause of the failure has not yet been determined. The manufacturer and local dealer had not yet been contacted about the failure. The failure mileage was 92,000.