Hey. I had this same problem!
No noise from speakers and had the SOS malfunction. It's a known issue.
Check this thread:
SOS Call System Failure! - BMW M5 Forum and M6 Forums
This is how i fixed it too (copied from 2nd page).
Quote:
Just a follow up on this problem.
I had it too. Had a service appt booked and everything.
Then I did a brake fluid flush and cleared the associated maintence service warning for the flush. Somehow that cleared the SOS warning, and all my music/ etc is working again.
Long story short, try clearing your codes, and that might fix your problem.
I found this thread while searching for the issue on my e70 x5. Thought it might help others.
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