Telematics Control Unit (TCU) Bluetooth
I am posting this after the fact so I apologize for not initially posting here.
The phone system in m 2008 E60 displayed an SOS Phone system failure.
The Phone system, bluetooth and Satellite Radio are controlled by a Telematics Conrol Unit (TCU)
I located the TCU in the trunk beneath the spare tire. The TCU along with the Tire Pressure Control Module (TPCM) were both nearly submerged in water. NOTE TO SELF, relocate both the TCU and TPCM the current location is vulnerable to water/liquid leaks because the truck does not drain.
I fixed this by locating a used TCU "still lookig for TPCM". One of the main keys here is to obtain your Part Number off your failed/damaged TCU and ensure the replacement part has the same Part Number. No programming was required. I plugged in the new unit and the Phone system, Bluetooth and Satellite Radio all came alive and the Phone SOS problem no longer displayed.
That is all, Problem Fixed The End
Key take away:
1. Factory location of TCU and TPCM is vulnerable to leaks beneath the spare tire sitting in a nicely sealed Styrofoam molded fitting that will not drain, thus it holds liquid
2. Ensure your researched part has the Same Part Number as your damaged unit. P.S. Several vehicles use this same TCU "BMW Mini"
3. No programming is necessary so a dealer visit is not required. It May take you 10 minutes to replace it if you move really slow are are unable to to place a square peg in a square hole. The dealer will charge of $1,000.00 for this!