While I'm attempting to get up to speed on the BMW communication system does anyone have a link to any sort of reference that explains the comm system components and what they do? I've found a ULF guide and Frankie's e38 bluetooth retrofit but am still hoping to quench my thirst for a complete understanding.

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2005 Titanium Silver X5 4.8is (DD winter) * 2001 Steel Blue 750iL (DD summer) * 2001 Ford Excursion 7.3 L <> 2005 X5 3.0 * 2003 X5 4.4i * 2009 X3 3.0 * 2009 X5 3.0 * 2007 Toyota Avalon Limited