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B1B8F







B1B8F-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT OPEN





For a complete wiring diagram Consult Diagrams/Electrical.

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 below the battery 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 in 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 low voltage.

- Set Condition:
The fault occurs when the OCM sensor circuit A/D feedback register is below the battery voltage limit and above the shorted low limit for 500 ms ± 110 ms.





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

Diagnostic Test

1. DETERMINE ACTIVE OR STORED DTC
Does the scan tool display active: B1B8F-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT OPEN?

Yes

- Go to 2

No

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

2. VERIFY SEAT POSITION SENSOR CIRCUITS




WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Disconnect the Driver Seat Track Position Sensor connector.
Measure the resistance between the (R261) Driver Seat Position Sensor Data circuit and the (R263) Driver Seat Position Sensor Voltage circuit at the Driver Seat Position Sensor connector.
Is the resistance below 10k ohms?

Yes

- Go To 6

No

- Go To 3

3. VERIFY OPEN SEAT POSITION SENSOR CIRCUITS




Disconnect the OCM C1 connector.
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.
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 9

No

- Go To 4

4. VERIFY DRIVER SEAT POSITION SENSOR PASSENGER SEAT WIRING




Disconnect the C311 body harness to Passenger Seat connector.
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.
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 *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

No

- Go To 5

5. VERIFY DRIVER SEAT POSITION SENSOR BODY WIRING




Disconnect the C310 body harness to Driver Seat connector.
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.
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 body wiring.

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

No

NOTE: Do not attempt to repair the seat wiring.

- Replace the Driver Seat wiring harness.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

6. VERIFY SEAT POSITION SENSOR CIRCUITS




Disconnect the OCM C1 connector.
Measure the resistance between the (R261) Driver Seat Position Sensor Data circuit and the (R263) Driver Seat Position Sensor Voltage circuit at the Driver Seat Position Sensor connector.
Is the resistance below 10k ohms?

Yes

- Go To 7

No

- Replace the OCM.
- Perform the *OCM REZERO. Restraint System

7. VERIFY SEAT POSITION SENSOR CIRCUITS




Disconnect the C311 Body Harness to Passenger Seat connector.
Measure the resistance between the (R261) Driver Seat Position Sensor Data circuit and the (R263) Driver Seat Position Sensor Voltage circuit at the Driver Seat Position Sensor connector.
Is the resistance below 10k ohms?

Yes

- Go To 8

No

NOTE: Do not attempt to repair the seat wiring.

- Replace the Passenger seat wiring.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

8. VERIFY SEAT POSITION SENSOR CIRCUITS




Disconnect the C310 Body Harness to Driver Seat connector.
Measure the resistance between the (R261) Driver Seat Position Sensor Data circuit and the (R263) Driver Seat Position Sensor Voltage circuit at the Driver Seat Position Sensor connector.
Is the resistance below 10k ohms?

Yes

NOTE: Do not attempt to repair the seat wiring.

- Replace the Driver Seat wiring.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

No

NOTE: Do not attempt to repair the seat wiring.

- Replace the Body Harness between the Driver Seat C311 connector and Passenger Seat C310.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests

9. CHECK OPERATION OF THE DRIVER SEAT TRACK POSITION SENSOR
Replace the Driver Seat Track Position Sensor.
Reconnect all disconnected components except the battery.

WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.

Connect the scan tool to the Data Link Connector - use the most current software available.
Use the scan tool and erase all codes in the OCM.
Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
Wait one minute, and read active codes.
Did the active B1B8F-DRIVER SEAT TRACK POSITION SENSOR CIRCUIT OPEN 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: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

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

- Replace the OCM.
- Perform the *OCM REZERO. Restraint System

No

- Repair is complete.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests.

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