B1B8E

B1B8E-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH





For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

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 circuit A/D feedback register is above the high voltage limit but not shorted low (as specified by calibration) for 500 ms ± 110 ms.

- When Monitored:
When powered, the CAN Bus ignition status is IGN_RUN, the module is configured for a Seat Track Position Sensor, and the module has successfully completed the shorted to ground test, the module checks the sensor circuit A/D feedback register for high voltage.

- Set Condition:
The fault occurs when the sensor circuit A/D feedback register is above the high voltage limit for 500 ms ± 110 ms.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.

1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)

NOTE: Ensure the battery is fully charged.

1. With the scan tool, read the OCM DTC.

Does the scan tool display any active DTC relating to internal faults, ignition faults, or battery faults?

Yes

- Perform the appropriate DTC. Testing and Inspection.

No

- Go To 2

2. VERIFY B1B8E-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH IS ACTIVE

Does the scan tool display active: B1B8E-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH DTC?

Yes

- Go To 3

No

- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Test.

3. VERIFY SEAT POSITION SENSOR CIRCUITS SHORT TO VOLTAGE





WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Disconnect the Driver Seat Track Position Sensor connector.
2. Disconnect the OCM C1 connector.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.

3. Measure the (R261) Driver Seat Position Sensor Data circuit voltage between the Driver Seat Position Sensor connector cavity 1 and ground.
4. Measure the (R263) Driver Seat Position Sensor Voltage circuit voltage between the Driver Seat Position Sensor connector cavity 2 and ground.

Is there voltage present on either circuit?

Yes

- Go To 4

No

- Go To 6

4. VERIFY SEAT POSITION SENSOR CIRCUITS SHORT TO VOLTAGE




1. Disconnect the C311 body harness to Passenger Seat connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit voltage between the Driver Seat Position Sensor connector cavity 1 and ground.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit voltage between the Driver Seat Position Sensor connector cavity 2 and ground.

Is there any voltage present on either circuit?

Yes

- Go To 5

No

- NOTE: Do not attempt to repair the seat wiring.

- Replace the Passenger seat wiring.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

5. VERIFY SEAT POSITION SENSOR CIRCUITS SHORT TO VOLTAGE




1. Disconnect the C310 body harness to Driver Seat connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit voltage between the Driver Seat Position Sensor connector cavity 1 and ground.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit voltage between the Driver Seat Position Sensor connector cavity 2 and ground.

Is there any voltage present on either circuit?

Yes

- NOTE: Do not attempt to repair the seat wiring.

- Replace the Driver seat wiring.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

- NOTE: Do not attempt to repair the seat wiring.

- Replace the Body Harness between the Driver and Passenger Seat.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

6. CHECK OPERATION OF THE DRIVER SEAT TRACK POSITION SENSOR

WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Replace the Driver Seat Track Position Sensor.
2. Reconnect all disconnected components except the battery.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.

3. Connect the scan tool to the Data Link Connector - use the most current software available.
4. Use the scan tool and erase all codes in the OCM.
5. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
6. Wait one minute, and read active codes.

Did the active B1B8E-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH DTC return?

Yes

- WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment and serious or fatal injury.

- WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

- CAUTION: Disconnecting or connecting the OCM connectors with the battery connected permanently damages the OCM.

- Replace the OCM.
- Perform the OCM REZERO. Testing and Inspection.

No

- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.