Theory Of Operation

When powered, the CAN bus ignition status is IGN_RUN, and the Occupant Classification Module (OCM) is configured for a Driver Seat Track Position Sensor (STPS), the Occupant Classification Module (OCM) diagnoses the internal and external circuits to verify system performance. The fault occurs when the sensor value read by the OCM is outside the expected range (as specified by calibration) of a working sensor for 500 ms ± 110 ms.