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Home >> Dodge and Ram >> 2009 >> Nitro SLT, RWD >> Repair and Diagnosis >> Engine Performance >> Ignition System >> (Totally Integrated Power Module (TIPM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0154-Lost Communication With Occupant Classification Module (OCM) >> Diagnostic Test

Diagnostic Test

  1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 
    NOTE: Ensure the Airbag fuse (48) is installed and battery voltage is between 10 and 16 volts before proceeding.
    1. With the scan tool, read active DTCs.

      Is this DTC active?

      Yes 

      • Go to step  2

      No 

  2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS 
    1. With the scan tool, read all active DTCs from all modules.
      NOTE: Check for TIPM configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

      Does the scan tool display any active DTCs to the conditions listed above?

      Yes 

      • Go to and perform the appropriate diagnostic procedure.

      No 

      • Go to step  3
  3. VERIFY THAT THE OCM IS ACTIVE ON THE BUS 
    1. Turn the ignition on.
    2. With the scan tool, select Network Diagnostics.
    3. Verify that the OCM is active on the bus.

      Is the OCM active on the bus?

      Yes 

      • Go to step  4

      No 

  4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS 
    1. With the scan tool, select Network Diagnostics.

      Is there more than one module with active DTCs "Logged Against" the OCM?

      Yes 

      No 

      • Go to step  5
  5. CLEAR DTC IN MODULE SETTING FAULT 
    1. With the scan tool, select the module setting the DTC against the OCM.
    2. Clear active DTCs.

      Is this DTC still active?

      Yes 

      No 

      • Go to step  6
  6. CYCLE IGNITION 
    1. Cycle the ignition from RUN to OFF three times ending with the key in the RUN position.

      Does this DTC become active?

      Yes 

      • Go to step  7

      No 

  7. CHECK FOR ADDITIONAL LOST COMMUNICATION FAULTS 
    1. With the scan tool, select Network Diagnostics.

      Does the TIPM and other CAN C BUS modules show Lost Communication with the remaining CAN C BUS modules?

      Yes 

      • Go to step  8

      No 

  8. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE 
    1. Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.

      Is the voltage above 5 volts?

      Yes 

      No 

      • Go to step  9
  9. (D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND 
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.

      Is the resistance below 10K Ohms?

      Yes 

      No