BIF 523900.19 – Conflicting Control Signals for Left Headlight (Dipped Beam) on Cab Frame. John Deere System Advisory.

BIF 523900.19 (BIF )

Code: 523900.19



Error code BIF 523900.19 is generated when the output controlling the left headlight (dipped beam) on the cab frame is improperly energized by more than one control unit. This indicates a problem within the CAN BUS system, where multiple control units are sending overlapping or conflicting signals to the same headlight function, potentially leading to erratic behavior or malfunction of the headlight system.


The conflicting signals can cause the left headlight (dipped beam) to behave unpredictably, including unintended activation or failure to respond to controls, thereby compromising visibility and safety during operation.


  • Identify and Isolate Control Units: Use diagnostic tools to determine which control units are sending the conflicting signals. Review software settings and wiring diagrams to understand the network configuration and identify potential overlaps.
  • Update and Configure Software: Ensure all involved control units have the latest software versions installed. Correct any configuration errors that may allow multiple units to control the left headlight relay.
  • Check CAN BUS Configuration: Review and potentially reconfigure the CAN BUS system to clearly define control pathways and responsibilities for each control unit to prevent overlap in commands.
  • Test System Integration: After making adjustments, test the integration of the control units to ensure they operate harmoniously, without sending overlapping signals to the relay.
  • Comprehensive System Testing: Conduct extensive testing of the electrical and control systems to verify that the issue has been fully resolved and that all components are communicating correctly without interference.


Maintaining clear and precise communication pathways in CAN BUS systems is vital for the stable and reliable operation of vehicle functions. Regular system checks and updates are recommended to prevent conflicts in command signals and ensure that components such as headlights operate as intended. Effective troubleshooting and prompt resolution of CAN BUS communication issues are essential for maintaining operational efficiency and safety standards.

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