1994 525i starting problem too.
When I bought my car, I only rec'd 1 key with it, and no code for the radio.
Display just says 'code'. I had problems starting my car, until it quit starting at all. I bought a new battery, and I had the same response after that, nothing. No, click, no whirr...silence. I had the starter taken out and took it to be tested. The first try, the little part that goes in and out to engage the starter (pinion? bendix? was corroded (please excuse my 'girl' descriptions...I will learn). The second and third test showed all the numbers to be right, so I new it was just that cruddy part. After I got it all cleaned up, I had it reinstalled and it started the car with a wire from the starter to the battery terminal, but with the key...still nothing. After reading a bit more, I have a couple of questions. Could my onboard computer need to be reset? How? Could my key need to be recoded? How? When I turn the key to the accessory position, all the lights come on. Everything seems to work but the radio, still, and starting the car. I read somewhere to but the key in the ignition and turn it on and off 5 times real quick, with the doors shut, unlock, and relock 3 times and it would reset the key code. OK...don't laugh. Where is the lock/unlock switch? It always locked when I started the car so I never needed to find it before. Also, will this really work? I also read something about putting the key near the outside mirror, brcause this is where the resetter is located, or something. Please let me know if these are actual methods, and if they might work in my case. Is there a better solution?