Normal Operation and Fault Conditions

The OCS determines if the passenger airbag needs to be deployed in the event of a crash by monitoring the pressure that is applied to the OCS bladder when weight of any occupant or object in the front passenger seat is present. When the vehicle is equipped with the front seat massage feature, the pressure that is applied to the OCS bladder can be affected by the operation of the front seat massage function. To account for this, the OCSM monitors various messages sent over HS-CAN from the SCM-H indicating the percentage of inflation for each bladder. 

There are a total of 4 bladders, used for the seat cushion massage function. Under normal operation, the seat cushion massage bladders deflate when the system is not in use. When the OCSM receives HS-CAN messages that indicate the seat massage function is disabled, but the bladders in the seat remain inflated beyond a certain threshold, it sets a DTC. Depending on the amount (percentage) of inflation that remains and the occupancy status of the seat, the OCSM may send a message to the RCM to indicate that a fault is present. If this occurs, the RCM sets DTC B00A0:68 and sends a message to the IPC to illuminate the airbag warning indicator.