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Old 03-21-2012, 07:12 PM
nhs156 nhs156 is offline
Officially Welcomed to the 'Fest
Location: Atlanta, GA
Join Date: Apr 2007
Posts: 228
Mein Auto: '10 M5
I experienced the exact same phenomenon in my '10 M5. It happened once and wouldn't go away until I realized the error of my ways - the high pitched sound came through my speakers and varied in tone with engine revs. Turns out my iPhone wasn't plugged in properly in my center console (USB all the way in, I think, but the audio connector wasn't). Once the IPhone was properly plugged in, the noise disappeared completely. Not sure if your issue is one and the same, but I'd check that iPhone plug - assuming such a thing also exists in the F10....
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