The car being as old as it is you won't be able to give the dealer the VIN to get your code, unless you bought it and have taken back to the same dealer for service. Check the glove box for small white sticker stuck on the side with numbers. Check the inside cover of the owners manual. I also saw someone mention looking on the back of the ashtray. If it's not in either of those places you will have to remove the radio to get the serial number off the back then the dealer can give you the code.