Bluetooth
 

my 06 E53 Bluetooth seems to have disappeared. my iPhone was paired with it and now nothing. I have attempted to reset it, but my telephone button doesn't seem to even work? possible issues?

Check your TCU. It's in the back on the left side down low. Try puling the fuse for it, then plug it back in. Like rebooting a computer.

found it, pulled it. that did it! thank you very much

Got the same issue - can I check which fuses you pulled - I think it's fuses 7, 73 and 74? How long did you leave them out for? I also disconnected the wiring harness - but no joy...

INPA and DIS say there's a "data transfer issue with the TCU" - or can't find blutooth connectivity - so sounds like it's suddenly fried... Another possibility is that the fuses have gone - but on visual inspection they look fine - so may try to see if there's any continuity with a voltmeter...