BCU 523692.00 – Upper Worklights on Cab Frame, Current Overload Protection Active at Power Module PC0. John Deere System Advisory.

BCU 523692.00 (BCU )

Code: 523692.00



Error code BCU 523692.00 is triggered when the Power Module PC0 in a John Deere vehicle measures a total amperage exceeding 40 amps at the A3 and D1 outputs. This condition affects the upper worklights on the cab frame, specifically the E35L/R worklights and the E08 right light on cab frame (dipped beam). The excessive amperage typically indicates a short to ground or a defective component within these circuits, prompting the system’s overload protection to activate in order to prevent electrical damage or potential fire hazards.


The overload protection mechanism will typically deactivate the affected outputs to prevent damage, leading to the loss of functionality for the associated lighting systems. This can impact visibility and safety, particularly in low-light conditions.


  • Inspect Affected Lighting Circuits: Examine the wiring and components associated with the E35L/R worklights and E08 right light on the cab frame. Look for signs of damage, wear, or corrosion that might contribute to a short circuit.
  • Measure Current Draw: Use a clamp meter or multimeter to measure the current draw at outputs A3 and D1 to accurately diagnose the source of the excessive current.
  • Identify and Repair Short Circuits: Locate any shorts to ground within the circuits. This may involve repairing or replacing damaged wires, connectors, or components found during the inspection.
  • Evaluate Power Module PC0: Assess the condition of Power Module PC0 to ensure that it hasn’t sustained damage from the overload condition. Replace or repair the module if necessary.
  • Reset the Power Module and Clear Diagnostic Codes: Once repairs are made and the circuit integrity is restored, reset Power Module PC0 to clear the overload condition and any associated diagnostic trouble codes.
  • Test Functionality of Lighting Systems: After the reset, activate the lighting systems to ensure they operate correctly without triggering further overload conditions. Monitor the system to confirm that all repairs are effective.
  • Continuous Monitoring and Maintenance: Implement regular inspections of the vehicle’s electrical systems to detect and resolve potential issues before they lead to system failures or safety hazards.


Regular maintenance and timely attention to electrical system issues are critical for maintaining the operational integrity and safety of agricultural machinery. Ensuring that all components function within their electrical specifications is essential for preventing overload conditions and maintaining optimal performance. This includes routine checks of wiring, connectors, and power modules to ensure they remain in good working condition.