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Diagnostic Test

  1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM) 
    NOTE: Make sure that the battery is fully charged.
    1. Turn the ignition on, then off and then on again.
    2. With the scan tool, read the Occupant Classification Module (OCM) DTCs.

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

      Yes 

      No 

      • Go to step  2
  2. PERFORM THE OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST 
    NOTE: Make sure that the battery is fully charged.
    NOTE: The Occupant Classification Seat Weights 9077 are required to perform this test.
    1. 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.
      NOTE: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion.
    2. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes and then proceed as follows.
    3. With the scan tool, read the OCM DTCs.

      Does the scan tool display any active PASSENGER SEAT WEIGHT SENSOR DTCs?

      Yes 

      • Go to step  3

      No 

  3. VERIFY THAT DTC B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH 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.
    1. Verify that all of the Seat Weight Sensor mounting screws are tightened to specification. Refer to Restraints - Specifications .
      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: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed, verify that the ignition is in run. Wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize. Only press scan tool buttons when directed to do so and perform the Occupant Classification Module System Verification Test to completion.
    2. With the scan tool in OCM, select More Options, select System Tests and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, wait two minutes and then proceed as follows.
    3. With the scan tool, read steamy DTCs.

      Does the scan tool display active B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH DTC?

      Yes 

      • Go to step  4

      No 

  4. 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 chaffed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals.

      Are any of these conditions present?

      Yes 

      No 

      • Go to step  5
  5. 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 step  6

      No 

  6. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Right-Rear Seat Weight Sensor Signal Circuit For A Short To Voltage
    GC0101819Courtesy of CHRYSLER LLC
    1. Disconnect the OCM C2 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 (R706) RT-RR Seat Weight Sensor Signal circuit.

      Is the voltage above 0.2 of a volt?

      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 RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .

      No 

      • Go to step  7
  7. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT 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. Disconnect the Right-Rear Seat Weight Sensor connector.
    2. Measure the resistance between the (R706) RT-RR Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go to step  8
  8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Right-Rear Seat Weight Sensor connector.

      Is the resistance below 5.0 Ohms?

      Yes 

        WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and may result in possible serious or fatal injury.
      • Replace the OCM in accordance with the Service Information.
      • Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .

      No 

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