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Diagnostic Test

  1. VERIFY THAT B1BBB-PASSENGER SEAT WEIGHT SENSOR INPUTS SHORTED TOGETHER DTC IS ACTIVE 
    1. With the scan tool, read OCM DTCs.

      Does the scan tool display active B1BBB-PASSENGER SEAT WEIGHT SENSOR INPUTS SHORTED TOGETHER DTC?

      Yes 

      • Go To  2.

      No 

      • Go To  5.
  2. 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 

      • Replace the Passenger Seat Harness in accordance with the Service Information.
        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.

      • Refer to STANDARD PROCEDURE  and perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure.

      No 

      • Go To  3.
  3. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT 
    1. Disconnect all four of the Seat Weight Sensor 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.

    2. Measure the voltage of the (R701) Seat Weight Sensor 5 Volt supply circuit on all four seat weight sensors.
      NOTE:

      Two Seat Weight Sensors should show a considerable difference in 5 Volt supply circuit voltage.

      Is the voltage above 4.8 volts?

      Yes 

      • Go To  5.

      No 

      • Go To  4.
  4. CHECK THE APPROPRIATE (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO THE OTHER APPROPRIATE (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY 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 (R701) Seat Weight Sensor supply circuit of the two suspect seat weight sensors.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the (R701) Seat Weight Sensor 5 Volt supply circuit of the suspect sensors shorted together.
      • Refer to STANDARD PROCEDURE and perform the AIRBAG SYSTEM VERIFICATION TEST.

      No 

        WARNING:

        If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.

      • Replace the OCM in accordance with Service Information.
      • Refer to DIAGNOSIS AND TESTING  and perform the B1BA7-OCCUPANT CLASSIFICATION SYSTEM VERIFICATION REQUIRED diagnostic test.
  5. TEST FOR INTERMITTENT CONDITION 
    1. With the scan tool, record and erase all DTCs from the OCM.
    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:

      Maintain a safe distance from all airbags while performing the following steps. 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 

      • Refer to DIAGNOSIS AND TESTING  and select appropriate diagnostic procedure.
      • Refer to STANDARD PROCEDURE  and perform the Occupant Classification Module System Verification Test in this Section.

      No 

      • No problem found at this time. Perform the Occupant Classification Module System Verification Test in this Section. Refer to STANDARD PROCEDURE . Erase all codes before returning vehicle to customer.
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