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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Occupant Restraint Controller (Orc) - DTCS B0118-95 To U0127-00 - 500 - Electric) >> DTC Troubleshooting >> B0131-15-Front Passenger Presence Detection - Circuit Short To Battery Or Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. VERIFY ACTIVE DTC 
    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.

    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 

  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. Refer to SENSOR, OCCUPANT DETECTION, 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:

      Probing of the circuit cavities at the ORC Module body harness connectors is only to be done with a approved test lead from the (special tool #10159, Test Leads, Dedicated), test lead 10159-6. Or a comparable test lead to prevent vehicle wiring harness connector damage during diagnostic procedures.

    5. Connect the test probes to the appropriate ORC harness connector terminal(s).
      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.

      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.

      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.

      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 in accordance with the Service Information. Refer to SENSOR, OCCUPANT DETECTION, REMOVAL .
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to 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

      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 in accordance with the Service Information. Refer to SENSOR, OCCUPANT DETECTION, REMOVAL .
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (R283) PASSENGER OCCUPANT DETECTOR SENSOR SIGNAL CIRCUIT AND (R261) 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 appropriate cavity.
    3. Measure the resistance of the ground circuit from the inline underseat harness connector to the 32 way side of the SRS Load Tool

      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. Refer to 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 appropriate cavity.
    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

      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. Refer to SENSOR, OCCUPANT DETECTION, 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. Refer to 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 (R261) Passenger Occupant Detector Sensor Return circuit at the appropriate terminals of the SRS Load Tool.

      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 in accordance with the Service Information. Refer to MODULE, 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 in accordance with the Service Information. Refer to SENSOR, OCCUPANT DETECTION, 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.

      No 

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