What's the matter with the Audi ignition latch failure?

[LucilleLee]

The vehicle's instrument panel displays a fault in the ignition latch and the steering lock system. Fault diagnosis: Using the ODIS diagnostic tool to read the fault code 0046, the comfort system central module 393 records the fault: entry or start authorization switch unreliable signal. Entering diagnostic inquiry, J393's E415 terminal 15 is short-circuited to ground. According to the diagnosis, continue to check, prompting to measure whether the grounding wire of 393 and E415 is normal. After measurement, the grounding wire is 0.3Ω, which is normal. Fault resolution: Clear the sunroof drainage pipe, clean the connector with alcohol, reinstall it cleanly, and the fault disappears. During routine maintenance, it is essential to regularly check the sunroof drainage pipe.