No, perform a MOST-bus system analysis.
Work through any MOST-bus communication faults. Diagnose and repair as necessary.
Check the MOST bus splice point for connection problems.
Check the MOST-bus optical connection. E.g. were the OPS/OPPS head is connected.
If anything was retrofitted on the MOST-bus (E.g. CDC, i-Pod, S-DARS, etc.) check the connections at the module that was retrofitted.
Uh oh, I just noticed my BMW assist is now inactive. I did get the MOST OEM iPod module installed a couple of months ago.
With non-iDrive cars is much less obvious that the SOS isn't working.
Bluetooth with iPhone still works fine. And I'm afraid if given the choice between iPod and emergency services, I'd choose iPod.