At a basic technical level, I'm surprised that any iPhone snap-in adapter behaves differently to connecting via a white USB cable. If the car can play music on the iPhone through USB, why does it matter where it's plugged in?
All that should change with a snap-in adapter is the addition of a signal boost through the car's aerial. Sadly, that doesn't seem to be the case and this PDF (in keeping with BMW, it's still on their website but hopelessly out of date) seems to confirm that you need 6NF to play music using a snap-in adaptor
Quote:
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The "Extended connection of the MP3 player in the mobile phone" (option code 6NF) can be used for selected mobile phones with a suitable USB snap-in adapter to access the music data stored there.
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