BCU 523692.04 – Excessive Current in Upper Worklights on Cab Frame. John Deere System Advisory.

BCU 523692.04 (BCU )

Code: 523692.04



The diagnostic trouble code BCU 523692.04 is activated when the power module PC0 detects an excessive current of more than 15 amps in lead 1029, which powers the upper worklights on the cab frame. This high current measurement is typically indicative of a short to ground within the circuit, a condition that can lead to overheating, potential damage to the electrical system, or a fire hazard.


In response to detecting this high current, the power module automatically activates its overload protection features, which may include shutting down the circuit to prevent further damage and alerting the operator through fault indicators.


  • Inspect the Circuit for Damage: Carefully examine the wiring and components in the circuit connected to lead 1029. Look for signs of damage such as worn insulation, exposed wires, or burnt components.
  • Test for Short to Ground: Use a multimeter to test the circuit for continuity and resistance. Any low resistance readings may indicate a short to ground.
  • Replace Faulty Wiring or Components: If any defects are found during the inspection, replace the faulty wiring or components to resolve the short to ground issue.
  • Ensure Proper Circuit Loading: Check that the load on the circuit does not exceed the design specifications. Adjust or redistribute the load if necessary.
  • Reset the Power Module and Test the System: After making repairs, reset the power module to clear the diagnostic code and test the circuit by turning on the worklights to ensure that the issue has been resolved and current levels are back within normal parameters.


Regular monitoring and maintenance of vehicle electrical systems are crucial for preventing issues such as shorts and overcurrent conditions. Early detection and correction of electrical faults help maintain the safety and efficiency of operations, thereby extending the life of the equipment.