BCU 523692.05 – No Current Detected in Upper Worklights on Cab Frame. John Deere System Advisory.

BCU 523692.05 (BCU )

Code: 523692.05



Error code BCU 523692.05 is triggered when the power module PC0 detects a current of less than 500 mA in lead 1029, intended for the upper worklights on the cab frame (E35), while these lights are switched on. This low current measurement typically indicates an open circuit, suggesting a disconnection or break somewhere within the circuit, which prevents the normal flow of electricity.


The power module will likely disable the affected worklights to prevent any unintended consequences of an open circuit, such as voltage irregularities or other related faults.


  • Inspect Wiring and Connectors: Thoroughly check the wiring and connectors associated with lead 1029. Look for breaks, disconnections, or signs of corrosion that might have caused the open circuit.
  • Test for Continuity: Use a multimeter to test for continuity within the circuit. This can help locate the exact point where the break or disconnection has occurred.
  • Repair or Replace Faulty Components: If any breaks or disconnections are found, repair or replace the faulty wiring or components to restore the integrity of the circuit.
  • Ensure Secure Connections: Make sure all connectors and terminals are securely connected and properly insulated to prevent future occurrences of open circuits.
  • Test the System: After repairs, reset the power module and test the worklights to ensure that they are receiving the correct current and are functioning as intended.


Regular maintenance and routine checks of the electrical system are crucial for the reliable operation of equipment. Addressing issues like open circuits promptly helps ensure the functionality and safety of the vehicle’s lighting and electrical systems, minimizing downtime and preventing further complications.