Description:

Error code BIF 522426.00 is triggered when the High Frequency (HF) Power Module PC6 detects a current exceeding 40 amps at outputs A3 and D3. This diagnostic trouble code specifically relates to the K06/05 or K02/05 relay for the rear window wiper. The excessive current typically indicates a short to ground or a defective component within the circuit. This fault may be associated with other functions linked to these outputs, such as the R17 resistor for the heated rear window, which may also trigger additional codes like ATC 522343.00, ETC 522343.00, or HTC 522343.00 due to the shared overload protection.

Reaction:

The power module activates current overload protection to prevent further damage, which might disable the rear window wiper and potentially other related functions.

Recommendations:

• Inspect Wiring and Connections: Check all associated wiring and connections for the K06/05 or K02/05 relay and the R17 resistor. Look for signs of damage, corrosion, or loose connections that could contribute to a short circuit.
• Test for Short Circuits: Using electrical testing tools, check for shorts to ground in the circuits connected to outputs A3 and D3. Focus particularly on the circuits related to the rear window wiper and the heated rear window.
• Replace Defective Components: If any components like the relay or resistor are found to be defective, replace them to resolve the overcurrent issue.
• Evaluate Power Module PC6: Ensure that the Power Module PC6 is functioning correctly and not contributing to the issue by falsely detecting high current levels.
• Reset Systems and Recheck: After repairs are completed, reset the affected systems to clear any fault codes. Test thoroughly to ensure all functionalities are restored and operating safely without triggering further overcurrent protection.

Note:

Regular monitoring and maintenance of the electrical systems and their components are crucial for preventing such issues. Addressing electrical faults promptly helps ensure the reliability and safety of vehicle operations, particularly in systems critical for visibility and safety like the rear window wiper and heater circuits.