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) and related circuits for the following faults:
- Resistance out of range
- Unexpected voltage
- Short to ground
- Faulted Belt Tension Sensor (BTS) (part of front passenger safety belt)
If a fault is detected, the OCSM stores DTC B0061:11, B0061:12, B0061:13, B0061:1C or B0061:49 in memory and sends a message to the RCM over the High Speed Controller Area Network (HS-CAN) 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 air bag warning indicator.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B0061:11 | Passenger Seatbelt Tension Sensor: Circuit Short to Ground | A fault is indicated when the OCSM measures voltage below a predetermined threshold on the Belt Tension Sensor (BTS) signal circuit. An open Belt Tension Sensor (BTS) VREF circuit can also set this DTC . |
| B0061:12 | Passenger Seatbelt Tension Sensor: Circuit Short to Battery | A fault is indicated when the OCSM measures voltage above a predetermined threshold on the Belt Tension Sensor (BTS) signal circuit. An open Belt Tension Sensor (BTS) return circuit can also set this DTC . |
| B0061:13 | Passenger Seatbelt Tension Sensor: Circuit Open | A fault is indicated when the OCSM senses an open on either Belt Tension Sensor (BTS) circuit. |
| B0061:1C | Passenger Seatbelt Tension Sensor: Circuit Voltage Out of Range | A fault is indicated when the passenger safety belt is unbuckled and the OCSM measures voltage on the Belt Tension Sensor (BTS) signal circuit greater than the maximum voltage returned during normal sensor operation. |
| B0061:49 | Passenger Seatbelt Tension Sensor: Internal Electronic Failure | A fault is indicated when the OCSM senses an internal fault on the Belt Tension Sensor (BTS) signal circuit. |