Well I removed the radio again, and pulled the cable going into the CD changer section. Using a couple test probes I hooked it up to a ghetto blaster and got sound, but when plugged into the radio no sound output. When I switch to the CD changer mode I get CD CHECK and then the station on the display, but I don't even get static on the radio. I guess it's possible I've got a bad radio, but in the CD changer install instructions I see it has to be activated, does the activation enable the input on the radio? or do I have to try and get BMW to repair/replace my radio.

Thanks

Gary