The contact owns a 2021 Toyota Rav4. The contact stated while driving at an undisclosed speed, the passengers side seat belt warning light illuminated. The contact stated that the passengers seat was not occupied by a passenger or object, but the warning light was illuminated. The contact received notification of NHTSA Campaign Number: 23V865000 (Air Bags); however, the part to do the repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted and confirmed that parts were not yet available. The manufacturer was not made aware of the failure. The approximate failure mileage was 30,000. VIN tool confirms parts not available.