I just acquired a 97 540 at an auction. I was given a key but not a remote control key. First question, I replaced the battery now the alarm activates when I reconnect the new battery. Second question, is there any place to acquire a remote key other than at the dealer? Third question the driver window is balky, will not go down. Likely problem and solution. Fourth question, the windshield wiper does not work when I activate the control. How can I track down the problem - switch or motor. It worked temporarily then stopped. Thanks!