The driver seatbelt failed to lock when rear end collision occurred and drivers face slammed into steering wheel. The steering wheel airbag failed to deploy when the car rear ended the vehicle in front of them. Drivers safety was jeopardized and now has severe concussion. Repair center stated seatbelt showed zero signs of locking and air bag shouldave deployed. Vehicle was inspected by insurance and was deemed a complete loss. No warning lights sounds or messages went off when vehicle was rear ended and front end collision.