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Home >> Fiat >> 2018 >> 500 Lounge, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 40 (Occupant Restraint Controller (Orc) - DTCS B0118-95 To U0127-00 - 500 - Electric) >> DTC Troubleshooting >> B012A-12-Passenger Seat Track Position Sensor - Circuit Short To Battery >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. IDENTIFYING VEHICLE EQUIPMENT 
    NOTE:

    Make sure the battery is fully charged.

    1. Turn the ignition on.
    2. With the scan tool, read ORC active DTCs.

      Does the scan tool display active DTC: B012A-12-FRONT PASSENGER SEAT TRACK POSITION SENSOR - CIRCUIT SHORT TO BATTERY?

      Yes 

      • Go To  2

      No 

      • Go To  8
  2. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT RESTRAINT CONTROLLER (ORC) 
    1. With the scan tool, read Occupant Restraint Controller (ORC) DTCs.

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

      Yes 

      No 

      • Go To  3
  3. INSPECT PASSENGER SEAT HARNESS WIRES 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.

    1. Using the wiring diagram/schematic as a guide, inspect the passenger seat harness 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 Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.

      • Replace the passenger seat harness in accordance with the Service Information.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  4
  4. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY 
    1. Verify that the Passenger Seat Harness is routed correctly.

      Is the Passenger Seat Harness routed correctly?

      Yes 

      • Go To  5

      No 

  5. CHECK FOR DTC B012A-12-FRONT PASSENGER SEAT TRACK POSITION SENSOR - CIRCUIT SHORT TO BATTERY WITH PASSENGER SEAT TRACK POSITION SENSOR DISCONNECTED 
    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 Seat Track Position Sensor 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. Wait two minutes, and then with the scan tool, read ORC DTCs.

      Does the scan tool display: B012A-12-PASSENGER SEAT TRACK POSITION SENSOR - CIRCUIT SHORT TO BATTERY?

      Yes 

      • Go To  6

      No 

      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.

  6. CHECK (R262) PASSENGER SEAT POSITION SENSOR DATA CIRCUIT AND (R264) PASSENGER SEAT POSITION SENSOR VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE 
    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 both 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.

    2. 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.

    3. Connect the test probes to the appropriate ORC harness connector terminal(s).
    4. Measure the voltage of the (R262) Passenger Seat Position Sensor Data circuit at the Passenger Seat Track Position Sensor harness connector.
    5. Measure the voltage of the (R264) Passenger Seat Position Sensor Voltage circuit at the Passenger Seat Track Position Sensor connector.

      Is the voltage above 0.2 of a volt on either circuit?

      Yes 

      NOTE:

      Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat 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.

      • Replace the Passenger Seat Harness in accordance with the Service Information.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK (R262) PASSENGER SEAT POSITION SENSOR DATA CIRCUIT FOR A SHORT TO THE (R264) PASSENGER SEAT POSITION SENSOR VOLTAGE CIRCUIT 
    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 resistance between the (R262) Passenger Seat Position Sensor Data circuit and the (R264) Passenger Seat Position Sensor Voltage circuit in the Passenger Seat Track Position Sensor harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      NOTE:

      Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.

      • Replace the passenger seat harness in accordance with the service information.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

  8. TEST FOR AN INTERMITTENT CONDITION 
    1. With the scan tool, record and erase all DTCs from the ORC.
    2. If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.
      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.

    3. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
    4. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
    5. The following additional checks may assist you in identifying a possible intermittent problem.
    6. Reconnect any disconnected components and 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.

    7. With the scan tool monitor active codes as you work through the following steps.
      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.

    8. Wiggle the wiring harness and connectors of the related airbag circuit or component.
    9. If only stored codes return continue the test until the problem area has been isolated.
    10. In the previous steps you have attempted to recreate the conditions responsible for setting active DTC in question.

      Are any ACTIVE DTCs present?

      Yes 

      No 

      • No problem found at this time. Erase all codes before returning vehicle to customer.
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