I had issues with my alarm on my 95 540i and couldnt get it off. I tried everything, like resetting the key but nothing and pulling the alarm fuse until I decided to tow it to a mechanic where he told me the alarm module and bcm are bad on the car. He says the ECM itself is fine but when I called the dealer they said I had to replace the entire ecm because the alarm module and bcm are part of it. The mechanic claims that's not true but now I'm not sure what to do.