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Yeah, I agree with you. As far as I know, this kind of bus is usually TDM or I2S.

Maybe you can achieve it through the "ethersnoop" diagnostic ethernet port in the passenger footwell.

Great try! Maybe the Ethersnoop interface (RJ45) could provide more Ethernet packet info. Because they said this interface is used for vehicle debugging.

In the diagram, the signal output from the Left Controller is already an "Analog Out", which is directly used to drive speakers. So I infer that they have integrated the amplifier chip into the network micro, bypassing the use of conventional audio bus.

It's possible they didn't use “A2B” bus on the audio downlink. The audio may be transmitted directly to each zonal controller via Etherloop.