Anti theft help!

About a month ago I bought a used 98 Chevy Cavalier from a dealership. Yesterday, I put in a new battery and everything went fine, except my CD player. It is stock. It wouldn't even turn on, it just said LOC on the screen. So I looked that up in my manual and that is an antitheft feature that happens when you lose power. I can only turn it off by entering my secret code, which the last person enabled I guess. It also said though that if I forgot my code then I could contact my dealer. So I called them first thing this morning and their service department isn't even open until monday. I know that they will be able to tell me what to do but I would really rather not wait the whole weekend without it. So if anyone knows what to do, has links, etc. they would be appreciated.
Thanks

Unfortunatly you are going to have to wait until Monday and go to your GM dealer...They can pull a preset unlock code out of your radio and will have to call a secret squirrel number to get the unlock code.
Don't mess with it too much because you can put the radio into a lock down that wii result in them having to take the radio out and send it to a radio shop.