Quote:

Originally Posted by jwac Probably because it's all an integrated module, and iDrive uses the audio system's amplifiers and speakers for BMW Assist, BT and its bongs and gongs. I imagine the non-iDrive audio system is never actually "off" either when you hit the "power" button, even though the display turns off.

Actually (technically) the non-iDrive display doesn't turn off. It just changes mode to display the clock. BT, gongs and bongs and BMW assist all still function with the "display off".

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2011 328i Convertible : Mineral White; Oyster/Black Dakota Leather; Premium, Sport, Value; Sport Wheel w/paddles; Heated Front Seats; Satellite radio; HK Sound
2012 528i Sedan : Titanium Silver; Oyster/Black Dakota Leather; Anthracite Wood; Comfort Access; Side & Top View Cameras; Cold Weather, Premium; Technology;
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2001 X5, 2009 528i (retired)