BCU 523826.03 – Nonexistent Function Activated. John Deere System Advisory.

BCU 523826.03 (BCU )

Code: 523826.03



Diagnostic trouble code BCU 523826.03 is generated when the control unit detects an open circuit in address BCU071, indicating an attempt to activate a nonexistent function. This could be due to incorrect software configurations, unintended user inputs, or faults in the control unit’s circuitry.


The control system may ignore the activation attempt and generate an alert or diagnostic message to notify the operator of the issue. The system’s functionality should remain unaffected except for the erroneous activation attempt.


  • Check Software Configurations: Ensure that the software settings and configurations are correct and up-to-date. Verify that no software settings are incorrectly attempting to activate non-existent functions.
  • Inspect Wiring and Connections: Examine the wiring and connections associated with address BCU071. Look for signs of damage, loose connections, or any other abnormalities that could lead to false activation signals.
  • Review User Inputs: Verify that the operator inputs are correct and that no unintended commands are being issued to the control unit.
  • Reset the Control Unit: Perform a reset of the control unit to clear any erroneous states. Ensure that the system is correctly initialized and configured upon restart.
  • Update Control Unit Software: If necessary, update the control unit software to the latest version to ensure any known issues are addressed and that the system operates with the most current parameters.
  • Consult Technical Support: If the issue persists, contact John Deere technical support for further assistance. Provide detailed information about the fault and any steps taken to resolve it.


Regularly updating and maintaining the control unit software and configurations is essential to avoid issues related to non-existent functions and other erroneous activations. Proper training for operators on system inputs and functionality can also help prevent unintended activations. Addressing these issues promptly helps ensure smooth and efficient operation of the equipment.

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