Ok, so I ran a wire from my amp ground distribution block to pin #3 on the 12-pin connector and while it dimmed the whine a tiny bit it is still there. Just to reconfirm it is the ULF I disconnected it and bam - whine all gone but of course not bluetooth.

So it definitely is the ulf module causing the whine. My only other thought is to run a wire from either the amp grounding block or the 12-pin connector to the ground wire on the 54-pin connector that connects to the ULF. Can anyone advise which wire is the ground wire there? Dumb thought but is it just the brown one?

Anyone else got any thoughts?

• 03 e39 13th gen BT with alternator whine - scotes 2008-04-08 01:30:41 (173 views)
  • Whine definitely form the ULF. What now? - scotes 2008-06-28 00:02:44 (66 views)
  • I think the ULF use the car's speaker & mic so the noise that you isolated from - bmw635 2008-04-18 02:47:27 (111 views)
    • So how to tie the grounds together? - scotes 2008-04-18 19:39:43 (113 views)
  • Anybody able to offer any help? - scotes 2008-04-18 01:30:06 (121 views)
  • Confirmed not the pairing button.... - scotes 2008-04-08 22:09:06 (121 views)