You need to pull the radio out and get the seriel number off of the radio itself. They were not very reliable to begin with and most had been replaced over the years under warranty. That's why you pull the number from the radio and not the car. You can then take proof of car ownership (insurance card, title, etc) to your local dealer and they can get it for you.
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You probably need the special 5-sided tool to loosen the two screws under the little doors on either side of the faceplate to pull out the radio. Try other tools, but if the screws are really tight, you need the proper tool, which you can buy on line.
Slide out the radio, read the serial number, and give it to the service writer at a BMW dealer. If they want to charge you money to look up the code, try another dealer.
That means that the battery has been disconnected. You will need to pull the radio out of the dash far enough to read the serial number. Then ask a service writer at the dealer to look up the code to unlock the radio. You punch in the code using the number buttons on the radio.
You need to pull the radio far enough out of the dash so you can read the serial number. The radio may be held in by two special 5-sided cup head screws beneath little doors in the radio face. If so, you can buy that tool on line, or you may get lucky and be able to loosen the screws with some other sharp tool.
If your dealer wants money to look up the serial number and get the code for you, try another dealer. I got my code for free from Niello BMW in Sacramento. (great dealer)
You'll have to go to the dealer to have them do it. They can pull your radio and read the serial number to get info from computer on which codes work for your radio. For giggles, check inside your owners manual case for a card that has it on it. There were two cards supplied to the original owners when bought new. Most people just put the cards in there.