96 BMW 328ic radio theft code

When the battery was changed in my car and I powered up the radio to enter the anti theft code, it says code waiting. How do I reset the system to enable me to enter the code? I am unable to use my radio/CD player. HELP!!

you need to eithere remove the radio and obtain s/n off the radio and call bmw dealership,they can get code ,look in owners manual for a credit card sized tag which staes radio code or go to a bmw dealer and have them do it