philippkoenig77

Seat Leon Hybrid Audio and Navigation Failure

I'm experiencing an issue with my 2020 Seat Leon hybrid. The audio system is completely non-functional, and the navigation system is also affected. There's no audio output whatsoever. A scan reveals a MOST bus fault stored in the error memory. Given the symptoms, I suspect a defect in one of the control units installed in the MOST bus. Has anyone else encountered a similar problem?

4 comment(s)

Ouch, that sounds familiar! I had a similar problem with my Leon – no audio system, nav was dead, the whole shebang. I’m guessing it’s related to the MOST bus network. Did you scan the error memory? Which control unit is reporting the fault?

Yes, the error memory points to a MOST bus fault. I don't have the specific control unit listed right now. Was your issue also related to a faulty control unit on the bus system?

Yep, in my case, it was a faulty amplifier on the MOST bus. The whole bus system went down because of it, crippling the audio and nav. Sounds like you're on the right track. Best bet is to get it properly diagnosed to pinpoint the exact control unit. You'll likely need a workshop with the right tools for bus network diagnostics.

Many thanks for the insight. It seems my suspicion of a MOST bus issue was correct. I took it to a workshop and they confirmed a faulty control unit on the bus system. Repair cost came to around 1000€. Appreciate the help.

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