[M_Bimmer]

Based on the wiring on your A42.1B connector, it neither has HiFi nor Active Sound.....since your pin 13 isn't populated.

Maybe you could check to see if your radio still produces the "Radio_On" signal and you could populate a wire in slot 13.....

Also, this thread is on the F10 M5 forum and you're asking about the F15 X5...so I had to go back to all the previous posts and update to reflect the F15 and not the F10...similar systems, but their connectors references and wiring colors are slightly different....