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Yeh, mine works exactly the same as with my old iPod (pre touch), but it doesnt charge, and then of course you can charge with a car charger because the AiNet is using the port! I would go line in to the head unit.
 
Your best bet might be to ask over on the Crutchfield forums.. I have the older AI-Net cable and it does in fact not charge the phone, but everything else does work.
 
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