I just changed out my DME and my CAS 3. They are used because I can't get a new one. They came as a set out of the same car with a key. But now I have no power at all, no lights ,radio or anything. I was told by the Mini dealer that my CAS 3 was going out that's why I changed them. I was told since they are a set out of the same car I would not have to do anything but replace them. So I'm not sure what's going on. Any help would be appreciated . Thank's Darrell