Seat warning module failed. When unbuckling seatbelt car ds not recognize you unbuckled, therefore the airbag system ds not recognize which seats are occupied. This would also cause a safety concern as you do not have to buckle the seatbelt with no warning or alert there is an issue. Car has been at Ford dealer for service for a month with them failing to find any other vehicle that they can replicate the problem. This is one Ford dealer, but it should be something that is investigated as it might be easily overlooked. Car has been in the dealership for the last month with no answers from Ford or resolution to the safety issue, following Federal regulations the dealer will not release the car back to us as it has a safety system malfunctioning.