Why does the panic alarm go off when I try unlocking my doors?

This past week my dad and I did an engine swap, we put an 3.8 from a 1998 olds 88 into a 1996 olds 88, the swap went well after we found all the trany bolts. But when I got the car home I locked the doors with the power locks and when I went to unlock the doors with the key the panic alarm went off and it wont shut off everytime I open the door it goes off again. I unhooked the battery and hooked it back up and havent locked the doors since because I'm worried about the panic going off again. We dont have a remote on our key chain and never had one since we bought the car for a panic button so we didnt even know that it had a panic alarm on it until this happened. So my question is do I have to do something that makes the car reconize the new engine we put in or is there away to disconnect the panic or anything I can do to stop this from happening I dont want to have to leave my car unlocked all the time, lol. Thank you so much for your help