B0131
B0131-15-FRONT PASSENGER PRESENCE DETECTION - CIRCUIT SHORT TO BATTERY OR OPEN
Special Tools:
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Occupant Detection Sensor (ODS) is a electrical resistance mat with cells that is located in the front passenger seat. This sensor is only used for passenger seatbelt reminder. The seat sensor assumes a passenger is present when a minimum of 103 pounds (47kg) of weight is placed in the seat the resistance will show 214 ohms. When a package or no person is occupying the passenger seat the resistance range will be between 214 and 1499 ohms. The resistance of the mat decreases, signaling to the ORC module that a passenger is present. The ORC then transmits this information to the Instrument cluster over the CAN bus. The passenger is only reminded to buckle up if the passenger seat occupant minimum weight threshold determined by the ODS is surpassed and the seat belt buckle is still not latched. The ODS receives battery voltage and clean ground through dedicated sensor plus and minus circuits from the ORC. The ORC receives, processes, and continuously monitors (monitor rate of 500 ms) the analog signal from the ODS. The ODS component is not repairable, if determined inoperable, it would require to be replaced with a new component. The seatbelt warning lamp will not set for this fault.
- When Monitored:
The ORC receives, processes, and continuously monitors (monitor rate of 500 ms) the analog signal from the ODS.
- Set Condition:
The ORC detects High voltage on the (R283) Passenger Occupant Detector Sensor Signal circuit for 2.5 - 5 seconds. The DTC will not latch for the entire ignition cycle. The code goes from Active to Stored 2.5 - 5 seconds after the code setting criteria is gone. This code also covers the Open fault. The Occupant Detector Signal Circuit will default to a unoccupied status with the open or short to battery fault.
Always Perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Restraints System Pre-Diagnostic Procedure.
1.
NOTE: The seat belt warning lamp in the instrument cluster does not set to indicate a passenger seat belt reminder feature.
NOTE: The use of a approved special tool or Digital Multimeter such as a Fluke Meter that will not apply more than 20 milliamperes to a circuit are the only measurement tools to be used.
VERIFY ACTIVE DTC
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read the ORC DTCs
NOTE: Diagnosing for the high code but also will be checking for an Open fault in both the (R283) signal and ground circuits.
Does the scan tool display active B0131-15-FRONT PASSENGER PRESENCE DETECTION - CIRCUIT SHORT TO BATTERY OR OPEN - DTC?
Yes
- Go To 2
No
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Restraints System Intermittent Condition Test.
2. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
NOTE: Repair of the wiring is only to be done on the seat body harness side of the connector. If the wiring fault is in the component side of the wiring harness routed into the seat cushion a ODS sensor replacement is to be performed. Occupant Detection Sensor - Removal .
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. Keep the Passenger Occupant Detector Sensor harness connector in the seat cushion connected.
2. Keep the passenger inline harness underseat connector connected.
3. Keep the Occupant Detection Sensor (ODS) in the passenger seat cushion connected.
4. Disconnect the ORC harness connectors.
NOTE: Check connectors - Clean and repair as necessary.
NOTE: After disconnecting the ORC module and the ORC module body harness connector, check the ORC module body harness connector shorting bar pin location. The shorting bar pin location should be down and not visible through the larger center holes of the ORC module body harness connector.
5. Connect the SRS Load Tool 56 Way ACM Adapter (8443-25) to the ORC harness connectors.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
6. Measure the voltage of the (R283) Passenger Occupant Detector Signal circuit at the appropriate terminal of the SRS Load Tool 56 Way ACM Adapter (8443-25).
Is there any voltage present?
Yes
- NOTE: The ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed.
- 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.
- Repair the (R283) Passenger Occupant Detector Signal circuit for a short to voltage.
- Replace the ODS sensor. Occupant Detection Sensor - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 3
3. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE BETWEEN THE ORC AND THE PASSENGER INLINE UNDERSEAT CONNECTOR
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.
NOTE: Check connectors - Clean/Repair as necessary.
1. Disconnect the passenger underseat harness connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
2. Measure the voltage between ground and the (R283) Passenger Occupant Detector Signal circuit at the appropriate terminal of the SRS Load Tool 56 Way ACM Adapter (8443-25).
Is there voltage present?
Yes
- NOTE: The ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed.
- 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.
- Repair the short to voltage in the (R283) Passenger Occupant Detector Signal circuit located between the ORC and the passenger underseat jumper harness connector.
- Replace the ODS Sensor. Occupant Detection Sensor - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 4
4. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE IN THE UNDERSEAT JUMPER HARNESS
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. Connect the passenger seat underseat connector.
NOTE: Confirm the connector is seated firmly and the lock tab is fully seated.
2. Access the Passenger Occupant Detector Sensor (ODS) harness connector located at the passenger seat cushion.
3. Disconnect the Passenger Occupant Detector Sensor (ODS) harness connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
4. Measure the voltage between ground and the (R283) Passenger Occupant Detector Signal circuit at the appropriate terminal of the SRS Load Tool 56 Way ACM Adapter (8443-25)
Is there voltage present?
Yes
- NOTE: The ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed.
- 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.
- Repair the short to voltage in the (R283) Passenger Occupant Detector Signal Circuit located between the passenger underseat connector and the Passenger Occupant Detector Sensor connector.
- Replace the ODS Sensor. Occupant Detection Sensor - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Go To 5
5. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SENSOR SIGNAL CIRCUIT AND (R284) PASSENGER OCCUPANT DETECTOR SENSOR RETURN CIRCUIT FOR AN OPEN OR HIGH RESISTANCE BETWEEN THE ORC AND THE PASSENGER UNDERSEAT HARNESS CONNECTOR
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 passenger underseat harness connector.
2. Measure the resistance of the (R283) Occupant Detector Sensor Signal circuit from the inline underseat harness connector to the 32 way side of the SRS Load Tool 56 Way ACM Adapter (8443-25) cavity 23.
3. Measure the resistance of the ground circuit from the inline underseat harness connector to the 32 way side of the SRS Load Tool 56 Way ACM Adapter (8443-25)
Is the resistance for either circuit below 1.0 Ohm?
Yes
- Go To 6
No
- Repair the (R283) Occupant Detector Sensor Signal circuit or Ground circuit for an open or high resistance.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
6. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SENSOR SIGNAL CIRCUIT AND PASSENGER OCCUPANT DETECTOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE IN THE SEATBACK JUMPER HARNESS
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. Reconnect the underseat harness connector.
NOTE: Inspect terminal pins and verify the underseat harness connector is fully seated correctly and that the connector locking tab is correctly in place.
2. Access the Passenger Occupant Detector Sensor located in the passenger seat cushion.
3. Disconnect the Passenger Occupant Detector Sensor harness connector.
4. Measure the resistance of the (R283) Occupant Detector Sensor Signal circuit from cavity 1 of the ODS connector to the 32 way side of the SRS Load Tool 56 Way ACM Adapter (8443-25) cavity 23.
5. Measure the resistance of the Occupant Detector Sensor Ground circuit from cavity 2 of the ODS connector to the 32 way side of the SRS Load Tool 56 Way ACM Adapter (8443-25)
Is the resistance for either circuit below 1.0 Ohm?
Yes
- Go To 7
No
- NOTE: Repair of the wiring is only to be done on the seat body harness side of the connector. If the wiring fault is in the component side of the wiring harness routed into the seat cushion a ODS sensor replacement is to be performed. Occupant Detection Sensor - Removal .
- Repair the (R283) Passenger Occupant Detector Signal circuit or Occupant Detector Sensor Ground circuit in the body harness for an open or high resistance.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
7. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SENSOR SIGNAL CIRCUIT AND PASSENGER OCCUPANT DETECTOR SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE WITH THE ODS HARNESS FULLY CONNECTED
NOTE: Confirm the connector is seated firmly and the lock tab is fully seated.
1. Connect the Occupant Detector Sensor (ODS), verify all in-line connections are secure.
2. Measure the resistance of the (R283) Passenger Occupant Detector Signal circuit to the (R284) Passenger Occupant Detector Sensor Ground circuit at the appropriate terminals of the SRS Load Tool 56 Way ACM Adapter (8443-25).
Is the resistance below 700 Ohms?
Yes
- WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- Turn the ignition Off and wait 15 seconds before turning the ignition On.
- Wait one minute and read active codes.
- If the B0131-15-FRONT PASSENGER PRESENCE DETECTION - CIRCUIT SHORT TO BATTERY OR OPEN becomes active, replace the ORC. Occupant Restraint Controller - Removal.
No
- Go To 8
8. CHECK OPERATION OF THE PASSENGER OCCUPANT DETECTOR 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 Passenger Occupant Detector Sensor. Occupant Detection Sensor - Removal.
2. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the Battery.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. 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 the ORC stored codes.
5. Turn the Ignition Off and wait 15 seconds before turning the Ignition On.
6. Wait one minute and read active codes and if there are none present read the stored codes.
Does the scan tool display active B0131-15-FRONT PASSENGER PRESENCE DETECTION - CIRCUIT SHORT TO BATTERY OR OPEN DTC?
Yes
- 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.
- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to follow these instructions may result in possible serious or fatal injury.
- Replace the ORC. Occupant Restraint Controller - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.
No
- Repair is complete.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Restraints System Verification Test.