BIF 523909.01 – Low Voltage Supply Fault in Right Headlight (Dipped Beam) on Cab Frame. John Deere System Advisory.

BIF 523909.01 (BIF )

Code: 523909.01



Error code BIF 523909.01 is triggered when the Power Module PC0 detects a supply voltage of less than 3 volts at the output for the right headlight (dipped beam) on the cab frame (lead 0792) when the headlight is switched on. This low voltage condition indicates a problem in the power supply circuit, which can prevent the headlight from operating correctly.


The low voltage may result in inadequate operation of the right headlight (dipped beam), potentially reducing or preventing proper illumination, which can impair visibility during operation.


  • Inspect and Test Power Supply Wiring: Examine the wiring and connections associated with lead 0792 for any signs of damage, wear, or loose connections that might be causing the low voltage issue.
  • Evaluate Relay and Connectors: Inspect the relay and its connectors for faults or degradation that could contribute to voltage drop. Replace the relay if it is found to be defective.
  • Check Voltage at Power Module PC0: Measure the voltage output from the Power Module PC0 to ensure it is providing adequate power to the headlight. If the module is found to be at fault, it may need repair or replacement.
  • Test for Continuity: Use a continuity tester to ensure there are no breaks or open circuits in the wiring leading to the right headlight.
  • System Reset and Voltage Recheck: After making any repairs or replacements, reset the system to clear the diagnostic trouble code. Recheck the voltage supply to the right headlight to ensure it is now within the correct range.
  • Comprehensive Electrical Diagnostics: Conduct thorough diagnostics on the entire circuit to ensure no additional electrical issues are present that could affect the operation of the headlight.


Maintaining the electrical integrity of vehicle systems is crucial for proper functionality and safety. Regular inspections and prompt resolution of voltage supply issues are important for the longevity and reliability of the headlight system, especially in adverse conditions where visibility is critical.

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