BIF 522427.12 – Unwanted Current in Windshield Wiper Circuit When Off. John Deere System Advisory.

BIF 522427.12 (BIF )

Code: 522427.12



Error code BIF 522427.12 is triggered when the Power Module PC0 detects an abnormal current exceeding 1 amp at the output for the windshield wiper relay (lead 2046), despite the windshield wiper being switched off. This high current condition usually indicates a shorted circuit or an internal fault within the power module itself, which can result in unnecessary power consumption and potential risks of electrical damage.


The power module may automatically initiate a protective shutdown of the windshield wiper circuit to prevent further damage and mitigate any safety risks.


  • Inspect Wiring for Shorts: Carefully examine the wiring associated with lead 2046 for any signs of damage, fraying, or exposure that could result in a short circuit.
  • Test Relay and Circuit Components: Utilize electrical testing tools to assess the relay and surrounding circuitry for faults. Replace the relay if it shows signs of malfunction or if it fails continuity tests.
  • Measure Current Levels: Use a multimeter to verify the exact current levels in the circuit when the windshield wiper is supposed to be off, to better understand the severity of the overcurrent and help pinpoint the exact location of the short.
  • Replace Damaged Components: If specific components are identified as faulty or damaged during the diagnostics, replace them to ensure the integrity of the circuit.
  • Evaluate Power Module PC0: Confirm that the Power Module PC0 is functioning correctly and not contributing to the issue by inaccurately measuring or failing to regulate current.
  • Reset Systems and Recheck: After repairs, reset the system to clear the error code. Test the windshield wiper system to ensure that no current flows when the wiper is switched off, verifying that the issue has been resolved.


It is crucial to address issues involving unexpected current flows immediately to prevent damage to the electrical system and ensure safe operation. Regular maintenance and inspections can help detect and correct such faults before they lead to more serious problems. This will help maintain the reliability and safety of the vehicle’s electrical systems, particularly in critical components like windshield wipers that are essential for driver visibility and safety.

Control Units: John Deere

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