Check the fuses under the hood and inside the car. That's a lot of different things on different sub-circuits that are inactive, which means it's probably a higher level fuse under the hood that supplies the smaller sub-circuits. It could be a module too, but I don't know enough about BMWs to know what the radio has to do with a module. Well, unless part of the radio function has to do with the security system or check engine codes or something similar. I'm guessing it's not the LKM because that shouldn't affect the window buttons or the radio (LKM is the light control module). So unless you have a bad LKM and some other unrelated problems, I don't think the LKM would be the issue.