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Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY THAT DTC B012B-64-DRIVER EARLY CRASH SENSOR - SIGNAL PLAUSIBILITY FAILURE IS ACTIVE 
    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:

    Using the wiring diagram/schematic as a guide check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

    NOTE:

    If after the harness inspection it appears the impact sensor connector is only seated halfway. Reseat the harness connector into the impact sensor and lock the tab.

    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.

    NOTE:

    Make sure the battery is fully charged.

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

      Does the scan tool display active: B012B-64-DRIVER EARLY CRASH SENSOR - SIGNAL PLAUSIBILITY FAILURE?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (R79) AND (R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT TO BATTERY 
    Fig 1: Checking Front Left Impact Sensor Signal & Ground Circuits For A Short To Battery
    GC0099304Courtesy of CHRYSLER GROUP, LLC
    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 Front Left Impact Sensor harness connector.
    2. Disconnect the ORC harness connectors.
    3. Connect the SRS Load Tool 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.

    4. Measure the voltage of the (R79) Front Left Impact Sensor Signal circuit and the (R81) Front Left Impact Sensor Ground circuit at the Front Left Impact Sensor connector.

      Is there any voltage present?

      Yes 

      • Repair the (R79) and (R81) Front Left Impact Sensor circuits for a short to battery.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (R79) AND (R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TO GROUND 
    Fig 2: Checking Front Left Impact Sensor Circuits For A Short To Ground
    GC0099305Courtesy of CHRYSLER GROUP, LLC
    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 ground and the (R79) Front Left Impact Sensor Signal circuit and the (R81) Front Left Impact Sensor Ground circuit at the Front Left Impact Sensor connector.

      Is the resistance below 100K Ohms?

      Yes 

      • Repair the (R79) and (R81) Front Left Impact Sensor circuits for a short to ground.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (R79) AND (R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER 
    Fig 3: Checking Front Left Impact Sensor Circuits For A Short Together
    GC0099306Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (R79) Front Left Impact Sensor Signal and the (R81) Front Left Impact Sensor Ground circuits at the Front Left Impact Sensor harness connector.

      Is the resistance below 100K Ohms?

      Yes 

      • Repair the (R79) and (R81) Front Left Impact Sensor circuits shorted together.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    Fig 4: Checking Front Left Impact Sensor Ground Circuit For Open Or High Resistance
    GC0138236Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (R81) Front Left Impact Sensor Ground circuit between the Front Left Impact Sensor harness connector and the SRS Load Tool Adaptor 8443-25.

      Is the resistance below 1 Ohm?

      Yes 

      • Go To  6

      No 

      • Repair the (R81) Front Left Impact Sensor Ground circuit for an open or high resistance.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
  6. CHECK THE (R79) FRONT LEFT IMPACT SENSOR CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    Fig 5: Checking Front Left Impact Sensor Circuit For Open Or High Resistance
    GC0138237Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (R79) Front Left Impact Sensor Signal circuit between the Front Left Impact Sensor harness connector and the SRS Load Tool Adapter 8443-25.

      Is the resistance below 1 Ohm?

      Yes 

      • Go To  7

      No 

      • Repair the (R79) Front Left Impact Sensor Signal circuit for an open or high resistance.
      • Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Refer to RESTRAINTS SYSTEM VERIFICATION TEST .
  7. CHECK OPERATION OF THE FRONT LEFT IMPACT SENSOR 
    1. Replace the Front Left Impact Sensor. Refer to SENSOR, IMPACT, REMOVAL .
    2. Reconnect the vehicle body harness to the impact sensor.
    3. 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.

    4. Connect the scan tool to the Data Link Connector - use the most current software available.
    5. Use the scan tool and erase the stored codes in all airbag system modules.
    6. Turn the Ignition Off, and wait 15 seconds before turning the Ignition On.
    7. Wait one minute, and read active codes and if there are none present read the stored codes.

      Did the active Front Left Impact Sensor DTC return?

      Yes 

      • Go To  8

      No 

  8. REPLACE THE OCCUPANT RESTRAINT CONTROLLER 
    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 airbag control module is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and serious or fatal injury.

    1. Disconnect the SRS Load Tool Adapter 8443-25.

      If there are no possible causes remaining, view repair.

      Repair 

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