B1B8C

B1B8C-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT PERFORMANCE





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 value read by the OCM is outside the expected range (as specified by calibration) of a working sensor for 500 ms ± 110 ms.

- When Monitored:
When powered, the CAN bus ignition status is IGN_RUN, the OCM monitors the sensor to determine if the sensor is working properly.

- Set Condition:
The fault occurs when the sensor value read by the OCM is between 7 and 12 ma.





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

1. CHECK FOR ACTIVE SEAT TRACK POSITION SENSOR CODES

NOTE: Ensure the battery is fully charged.

1. Turn the ignition on.
2. With the scan tool, read active OCM DTC.

NOTE: If B1B8D, B1B8E, B1B8F or B1B91 Seat Track Position Sensor DTC are active, you must run these tests before continuing.

Does the scan tool display any active: B1B8D, B1B8E, B1B8F or B1B91 Seat Track Position Sensor codes?

Yes

- Perform the appropriate DTC. Testing and Inspection.

No

- Go To 2

2. VERIFY ACTIVE DRIVER SENSOR PERFORMANCE

Does the scan tool display active: B1B8C-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT PERFORMANCE?

Yes

- Go To 3

No

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

3. PERFORM SEAT TRACK POSITION SENSOR PERFORMANCE TEST
1. With the scan tool monitor the Driver Seat Track Position Sensor state.
2. While observing the scan tool display, move the Driver Seat to the full forward position and then to the full rearward position.

Does the Driver Seat Track Position Sensor change state when the seat is moved?

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

- 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.

- Replace the Driver Seat Track Position Sensor.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
- If the B1B8C-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT PERFORMANCE DTC returns active:
- 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.