B1B93
B1B93-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW
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 Passenger 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 Passenger 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
Diagnostic Test
1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)
NOTE: Ensure the battery is fully charged.
With the scan tool, read OCM DTC.
Does the scan tool display any active DTC relating to internal faults, ignition faults, or battery faults?
Yes
- Diagnose and repair the DTC. Restraint System
No
- Go To 2
2. VERIFY THAT DTC B1B93-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW IS ACTIVE
Does the scan tool display active: B1B93-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW?
Yes
- Go To 3
No
- Perform *RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Test
3. INSPECT PASSENGER SEAT WIRING AND CONNECTORS
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.
Using the wiring diagram/schematic as a guide, inspect the 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 Passenger Seat wiring.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests
No
- Go To 4
4. VERIFY PASSENGER SEAT WIRING CORRECTLY ROUTED
Verify Passenger Seat wiring is routed correctly.
Is the Passenger Seat wiring routed correctly?
Yes
- Go To 5
No
- Reroute the Passenger Seat wiring as necessary.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests
5. VERIFY B1B93-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW IS ACTIVE
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Disconnect the Passenger Seat Track Position Sensor connector.
Connect a jumper wire between cavity 1 and Cavity 2 of the Passenger Seat Track Position Sensor connector
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
CAUTION: Disconnecting or connecting the OCM connectors with the battery connected will permanently damage the OCM.
With the scan tool, read OCM DTC.
Does the scan tool display active: B1B95-PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT OPEN DTC?
Yes
- Go To 9
No
- Go To 6
6. VERIFY PASSENGER SEAT POSITION SENSOR SHORT TO GROUND
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Measure the (R262) Passenger Seat Position Sensor Data circuit resistance between the Passenger Seat Track Position Sensor connector cavity 1 and ground.
Measure the (R264) Passenger Seat Position Sensor Voltage circuit resistance between the Passenger 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 8
7. VERIFY PASSENGER SEAT POSITION SENSOR CIRCUITS SHORT TO GROUND
CAUTION: Disconnecting or connecting the OCM connectors with the battery connected will permanently damage the OCM.
Disconnect the OCM C1 connector.
Measure the (R262) Passenger Seat Position Sensor Data circuit resistance between the Passenger Seat Track Position Sensor connector cavity 1 and ground.
Measure the (R264) Passenger Seat Position Sensor Voltage circuit resistance between the Passenger 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 Passenger Seat wiring.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests
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.
- Replace the OCM.
- Perform the *OCM REZERO. Restraint System
8. VERIFY PASSENGER SEAT CIRCUITS SHORT TO GROUND
Disconnect the OCM C1 connector.
Measure the (R262) Passenger Seat Position Sensor Data circuit resistance between the OCM C1 connector cavity 8 and the Passenger Seat Track Position Sensor connector cavity 1.
Measure the (R264) Passenger Seat Position Sensor Voltage circuit resistance between the OCM C1 connector cavity 7 and the Passenger Seat Track Position Sensor connector cavity 2.
Is the resistance below 10k ohms on both circuits?
Yes
- Go To 9
No
NOTE: Do not attempt to repair the seat wiring.
- Replace the Passenger Seat wiring.
- Perform *RESTRAINTS SYSTEM VERIFICATION TEST. Verification Tests
9. CHECK OPERATION OF THE PASSENGER SEAT TRACK POSITION SENSOR
Replace the Passenger 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 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: 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.