BCU 523760.31 – Open Circuit Detected in Turn Signal/Hazard Flasher System. John Deere System Advisory.

BCU 523760.31 (BCU )

Code: 523760.31



The diagnostic trouble code BCU 523760.31 is triggered when the Body Control Unit (BCU) detects an open circuit in the turn signal/hazard flasher system immediately after the ignition is turned on. This indicates a disconnection or break in the electrical circuit responsible for operating the turn signals and hazard flashers, potentially affecting the vehicle’s ability to signal its intentions to other road users.


Upon detection of an open circuit, the system may deactivate the turn signals and hazard flashers to prevent unreliable signaling. An alert or warning may also be displayed to the operator, indicating the need for system inspection and repair.


  • Inspect Wiring and Connectors: Thoroughly examine all wiring and connectors associated with the turn signal and hazard flasher system. Look for signs of damage, wear, or disconnections that could be causing the open circuit.
  • Test for Continuity: Use a multimeter to test the continuity of the circuit. This helps identify the specific location where the circuit is broken.
  • Repair or Replace Faulty Wiring or Components: If any breaks or disconnections are found, repair or replace the faulty wiring or connectors to restore electrical connectivity.
  • Check System Functionality: After repairs are made, check the functionality of the turn signals and hazard flashers to ensure they are operating correctly and reliably.
  • Reset the System: Clear the diagnostic trouble code from the BCU and perform a system reset if necessary to ensure all systems are functioning normally.


Regular maintenance of the vehicle’s electrical systems, including routine checks of wiring integrity and connector security, is essential for ensuring reliable operation. Addressing issues like open circuits promptly can prevent safety hazards and maintain the vehicle’s compliance with traffic regulations. Proactive troubleshooting and maintenance are key to minimizing downtime and enhancing the safety and efficiency of vehicle operations.