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I would take this to the main board as this is the audio board.
Also you may fine there is little feedback on the 320 here because it
is a Euro model and most of the member here are in the US where we never had the 4 cylinders .
There was a recall for the Electrical Connector to the Main Cabin Fuse board here in some years.
(Power Connector)
Always be sure you have a strong battery and alternator before going further in trying to diagnose problems on these.
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