BIF 522426.01 – Low Voltage Supply Fault in Rear Window Wiper Relay. John Deere System Advisory.

BIF 522426.01 (BIF )

Code: 522426.01



Error code BIF 522426.01 is generated when the High Frequency (HF) Power Module PC6 detects a voltage of less than 3 volts at the relay supplying power to the rear window wiper (lead 2026), specifically when the wiper is activated. This low voltage condition indicates a possible fault in the power supply to the relay, which can impair the functionality of the rear window wiper.


The system may respond by disabling the rear window wiper to prevent damage or erratic behavior due to insufficient power supply.


  • Inspect and Test Power Supply Wiring: Check the wiring and connections associated with lead 2026 for any signs of damage, wear, or loose connections that might be causing the low voltage issue.
  • Evaluate Relay and Connectors: Examine the K06/05 or K02/05 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 PC6: Measure the voltage output from the Power Module PC6 to ensure it is providing adequate power to the relay. If the module is found to be at fault, it may need repair or replacement.
  • 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 rear window wiper relay 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 rear window wiper.


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 rear window wiper system, especially in adverse weather conditions where visibility is critical.

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