Description:

Error code BIF 522426.19 is reported when the output that controls the rear window wiper relay on Power Module (HF) PC6 is erroneously energized by more than one control unit. This diagnostic trouble code indicates a communication error in the CAN BUS system where multiple units are sending conflicting signals to activate the rear window wiper, potentially leading to erratic operation or premature wear of the relay.

Reaction:

The system may exhibit unpredictable behavior of the rear window wiper function, possibly causing it to activate unintentionally or not turn off when commanded.

Recommendations:

• Identify and Isolate Control Units: Use diagnostic tools to determine which control units are sending the conflicting signals. Check for misconfigurations or software glitches that could cause multiple units to control the same function.
• Update and Configure Software: Ensure that all involved control units are running the latest software versions. Correct any configuration errors that may allow multiple units to control the rear window wiper relay.
• Check CAN BUS Configuration: Review and, if necessary, reconfigure the CAN BUS system to clearly define control pathways and responsibilities for each control unit to prevent signal conflicts.
• Test System Integration: After adjustments, test the integration of the control units to ensure they are operating harmoniously without overlapping functionalities.
• Comprehensive System Testing: Conduct extensive testing of the electrical and control systems to ensure that the issue has been fully resolved and that all components are communicating correctly.

Note:

Maintaining clear and proper communication pathways in CAN BUS systems is vital for the stable and reliable operation of vehicle functions. Regular checks and updates are crucial to prevent conflicts in command signals and ensure that each component operates as intended. Addressing CAN BUS communication issues promptly helps maintain operational efficiency and system integrity.