An occupant protection system of a vehicle comprises a seat load measuring subsystem and an occupant protection subsystem. The seat load measuring subsystem includes a controller and weight sensors attached to a vehicle seat, each weight sensor providing a weight signal. The controller provides information determined by a weight of an occupant of the vehicle seat. In response to a detection of a crash, the occupant protection subsystem provides a crash signal determined by a magnitude of the crash. In response to a reception of the crash signal, the controller automatically decides whether a weight sensor under diagnosis is normal, abnormal or intermediate between normal and abnormal on the basis of a level of the crash signal and the weight signals obtained from the weight sensor before and after the crash.
Seat load measuring system that automatically makes a self diagnosis and zero point adjustment in response to a vehicle crash