radio locked

Does anyone know how to unlock the radio on a 1996 buick riviera, I don't have any books on it.
Thanks

It takes you getting the back up code out of the radio and calling a phone number to get the unlock code!! The only problem is you have to be a dealer to use the phone number because you need a special dealer code number just to use the system. So go see your dealer and ask them what the charge is to unlock your radio.

I got a bypass code at www.geocities.com/unlocker03
It worked great and was fast.