BCU 523692.00 – Current Overload Protection Triggered for Upper Worklights on Cab Frame. John Deere System Advisory.

BCU 523692.00 (BCU )

Code: 523692.00



This diagnostic trouble code, BCU 523692.00, occurs when the power module PC0 detects a current exceeding 40 amps at the A3 and D1 outputs, which are linked to the upper worklights and other lighting systems on the cab frame. This overcurrent condition generally indicates a short to ground or a defective component within these circuits:

  • Output A3: E08 Right Light on Cab Frame (Dipped Beam), potentially triggering Diagnostic Trouble Code BIF 523909.00.
  • Output D1: E35L/R Worklights on Cab Frame, associated with Diagnostic Trouble Code BCU 523692.00. Such faults can lead to significant risks including electrical fires or component failures.


The power module automatically activates current overload protection to shut down the affected outputs. This action prevents further damage and alerts the operator to the presence of a serious fault.


  • Inspect Affected Circuits: Carefully examine the wiring and connections for the outputs A3 and D1. Look for signs of damage, overheating, wear, or corrosion that might contribute to a short circuit.
  • Test for Short Circuits: Use electrical testing equipment to check for shorts to ground in the affected circuits. This involves measuring resistance and ensuring it aligns with expected values.
  • Replace or Repair Damaged Components: If damaged wires or components are discovered, replace or repair them to restore normal operation and prevent future overcurrent events.
  • Verify Load Specifications: Ensure that the electrical load on each output does not exceed the recommended specifications. Adjust as necessary by redistributing or reducing load.
  • Reset and Test the System: After repairs, reset the power module and test the system extensively to confirm that the issue is resolved and that no further overcurrent conditions occur.


Regular maintenance and inspections of the electrical systems are crucial for the safety and operational reliability of machinery. Addressing overcurrent issues promptly helps prevent extensive damage and maintains the functionality of critical lighting and other electrical systems on the vehicle.