I just asked this question at enterprise motors in wisconsin. I asked the service manager for help. My question was can you take a keyless remote out of another bmw that was equiped with tthe keyless system. He said that it is possible but you have to replace a chip that is in one of the computers. What I would do is call a local BMW dealer and talk to someone in service. They are usually extremelly nice and will help out whenever they can. Otherwise email me and I will give you the name and number of the service man that I talked to.