Normal Operation and Fault Conditions
The Belt Tension Sensor (BTS) operates in conjunction with the OCS. The OCS interprets a variable voltage signal provided by the Belt Tension Sensor (BTS) to identify the possible presence of a child safety seat in the front passenger seat. The voltage output of the Belt Tension Sensor (BTS) is proportional to the amount of tension applied to the sensor by the belt: no belt tension causes a low voltage (approximately 0.95 volt) to be output and high belt tension causes a high voltage (approximately 3.8 volts) to be returned to the OCSM.
The OCSM monitors the Belt Tension Sensor (BTS) reference voltage circuit for a short to voltage or a short to ground.
If a fault is detected, the OCSM stores DTC B00C2:11 or B00C2:12 in memory and sends a message to the RCM over the HS-CAN2 indicating that an OCS fault is present. Upon receipt of this message, the RCM sets DTC B00A0:09 and sends a message to the IPC to illuminate the airbag warning indicator.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B00C2:11 | Passenger Seat Occupant Classification Sensor "C": Circuit Short to Ground | Sets when the OCSM senses a short to ground from the Belt Tension Sensor (BTS) reference voltage circuit. |
| B00C2:12 | Passenger Seat Occupant Classification Sensor "C": Circuit Short to Battery | Sets when the OCSM senses a short to voltage from the Belt Tension Sensor (BTS) reference voltage circuit. |