WHILE DRIVING THE VEHICLE IN REVERSE, THE DRIVER'S AIR BAG DEPLOYED FOR NO REASON. THE DIVER WAS SLIGHTLY INJURED. THE VEHICLE'S MAINTENANCE HISTORY WAS LOOKED AT. THIS VEHICLE WAS NEVER IMPLICATED IN AN ACCIDENT. THE FORD DEALER FOUND THAT THE ELECTRICAL WIRING FOR THIS AIRBAG WAS CORRODED. THIS WOULD BE THE REASON WHY THE AIRBAG DEPLOYED. THIS ELECTRICAL WIRE SHOULD BE BETTER PROTECTED. THE DEALER REFUSED TO REPAIR IT UNDER WARRANTY BECAUSE IT IS NOT VALID ANYMORE.