BCU 523843.04 – Quick Withdrawal Switch, Voltage Too Low. John Deere System Advisory.

BCU 523843.04 (BCU )

Code: 523843.04



Diagnostic trouble code BCU 523843.04 is generated when the Basic Control Unit (BCU) detects that the voltage at the signal input of the quick withdrawal switch falls below 1 volt, indicating a malfunction within the circuit of the quick withdrawal switch. This low voltage could be due to a variety of issues, such as poor connections, damaged wires, or a faulty switch, potentially leading to inadequate switch operation.


The system may disable or limit the functionality associated with the quick withdrawal switch to prevent any unintended consequences arising from incorrect switch operation. An alert is likely displayed on the control panel to inform the operator of the voltage irregularity.


  • Inspect Wiring and Connections: Carefully examine the wiring and connectors leading to the quick withdrawal switch. Look for signs of wear, damage, or loose connections that could be causing the low voltage issue.
  • Measure Voltage at the Switch: Utilize a multimeter to check the voltage at the quick withdrawal switch to accurately assess the voltage levels being supplied under normal conditions.
  • Replace Faulty Switch: If the switch itself is found to be faulty or damaged, replacing it may resolve the issue and restore normal operation.
  • Check for Additional Circuit Issues: Investigate other components within the same circuit, such as resistors or connectors, which might influence voltage levels, and replace or repair them if necessary.
  • Reset and Calibrate the System: After making any necessary repairs or replacements, reset the system to clear any fault codes and recalibrate the settings to ensure all components are functioning within their specified parameters.


Routine checks and maintenance of electrical systems are vital for preventing issues that could affect the performance and safety of machinery. By addressing electrical faults promptly and effectively, the longevity and reliability of the equipment are maintained. Training operators to recognize and report early signs of electrical issues can also help prevent more significant problems down the line.

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