BIF 522426.12 – Unwanted Current Detected in Rear Window Wiper Circuit When Off. John Deere System Advisory.

BIF 522426.12 (BIF )

Code: 522426.12



Error code BIF 522426.12 is triggered when the Power Module (HF) PC6 detects a current in excess of 1 amp at the output for the rear window wiper relay (lead 2026), even though the rear window wiper is switched off. This condition typically indicates a shorted circuit or an internal fault within the power module itself, which can lead to unnecessary power consumption and potential damage to the electrical system.


To prevent damage, the power module might initiate a safety shutdown of the affected circuit, disabling the rear window wiper until the issue is resolved.


  • Inspect Wiring for Shorts: Thoroughly examine the wiring associated with lead 2026 for any signs of damage, fraying, or exposure that could result in a short circuit.
  • Test Relay and Circuit Components: Use 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: Confirm the exact current levels using a multimeter 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 diagnostics, replace them to ensure the integrity of the circuit.
  • Evaluate Power Module PC6: Check the Power Module PC6 for any internal faults that could be causing unintended current flow. Repair or replace the module if necessary.
  • Reset Systems and Recheck: After repairs, reset the system to clear the error code. Re-test the rear window wiper system to ensure that no current flows when the wiper is switched off, verifying 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.

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