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B1B8D






B1B8D-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT LOW





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

Theory of Operation

When powered, the CAN bus ignition status is in 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 below the low voltage limit (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 Driver Seat Track Position Sensor, the module checks the sensor circuit A/D feedback register for voltage below the low voltage limit for 500 ms ± 110 ms.

- Set Condition:
The fault occurs when the sensor circuit A/D feedback register is below the below the low 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: Make sure the battery is fully charged.

1. With the scan tool, read OCM DTC.

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

Yes

- Perform the appropriate DTC. Testing and Inspection.

No

- Go To 2

2. VERIFY THAT DTC B1B8D-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT LOW IS ACTIVE

Does the scan tool display active: B1B8D-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT LOW DTC?

Yes

- Go To 3

No

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

3. INSPECT DRIVER AND PASSENGER SEAT WIRING AND CONNECTORS

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.

1. Using the wiring diagram / schematic as a guide, inspect the Driver and Passenger Seat wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.

Are any of these conditions present?

Yes

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

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

No

- Go To 4

4. VERIFY DRIVER AND PASSENGER SEAT WIRING CORRECTLY ROUTED
1. Verify Driver and Passenger Seat wiring harness is routed correctly.

Is the seat wiring routed correctly?

Yes

- Go To 5

No

- Reroute the seat wiring as necessary.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

5. VERIFY 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. Disconnect the Driver Seat Track Position Sensor connector.
2. Connect a jumper wire between cavity 1 and Cavity 2 of the Driver Seat Track Position Sensor 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.

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

3. With the scan tool, read OCM DTC.

Does the scan tool display active: B1B8F-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT OPEN DTC?

Yes

- Go To 13

No

- Go To 6

6. VERIFY DRIVER SEAT POSITION SENSOR SHORT TO GROUND





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

Is the resistance below 10k Ohms on either circuit?

Yes

- Go To 7

No

- Go To 10

7. VERIFY OCM DRIVER SEAT POSITION SENSOR CIRCUITS SHORT TO GROUND




1. Disconnect the OCM C1 connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit resistance between the Driver Seat Track Position Sensor connector cavity 1 and ground.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit resistance between the Driver Seat Track Position Sensor connector cavity 2 and ground.

Is the resistance below 10k Ohms on either circuit?

Yes

- Go To 8

No

- 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.

- 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.

8. VERIFY DRIVER SEAT CIRCUIT SHORT TO GROUND




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

Is the resistance below 10k Ohms on either circuit?

Yes

- Go To 9

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.

9. VERIFY DRIVER SEAT CIRCUITS SHORT TO GROUND




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

Is the resistance below 10k Ohms 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 wiring harness between the Driver and Passenger Seat.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

10. VERIFY OPEN SEAT POSITION SENSOR CIRCUITS




1. Disconnect the OCM C1 connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit resistance between the OCM C1 connector cavity 10 and the Driver Seat Track Position Sensor connector cavity 1.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit resistance between the OCM C1 connector cavity 9 and the Driver Seat Track Position Sensor connector cavity 2.

Is the resistance below 5.0 Ohms on both circuits?

Yes

- Go To 13

No

- Go To 11

11. VERIFY DRIVER SEAT POSITION SENSOR PASSENGER SEAT WIRING




1. Disconnect the C311 body harness to Passenger Seat connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit resistance between the OCM C1 connector cavity 10 and the C311 (seat side) connector cavity 4.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit resistance between the OCM C1 connector cavity 9 and the C311 (seat side) connector cavity 3.

Is the resistance below 5.0 Ohms on both circuits?

Yes

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

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

No

- Go To 12

12. VERIFY DRIVER SEAT POSITION SENSOR BODY WIRING




1. Disconnect the C310 body harness to Driver Seat connector.
2. Measure the (R261) Driver Seat Position Sensor Data circuit resistance between the C311 (body side) connector cavity 4 and the C310 (body side) connector cavity 1.
3. Measure the (R263) Driver Seat Position Sensor Voltage circuit resistance between the C311 (body side) connector cavity 3 and the C310 (body side) connector cavity 2.

Is the resistance below 5.0 Ohms on both circuits?

Yes

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

- Replace the body wiring harness between the C311 (body side) connector and C310 (body side) connector.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.

No

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

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

13. CHECK OPERATION OF THE DRIVER SEAT TRACK POSITION SENSOR
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 B1B8D-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT LOW 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.

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