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I suppose they may be able to do this with a software update, however I spent quite a while looking at what is exposed in the head unit and there is a lot of functionality there. It looks to be highly integrated with the EVIC/DID and a few body modules via the main CPU. I would have to guess that the head unit needs to remain on so it communicates with the BUS and manages settings and the climate stuff and why it can't be completely shut off.
 
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