If you unhook your battery now, you'll have to reprorogram all your radio stations.
Just look in your owner's manual for the fuse layout. Locate the fuse for "PCM". This is usually a 5A or so fuse. Pull it and wait 15 minutes. Reinstall it and allow your PCM to relearn parameters.
exactly which fuse varies by model year which you failed to provid. For example, on a 97, it's in the underhood mini-fuse box. A 2000 uses F2 in the underdash fuse panel, etc.....
Anyway, just look in your owner's manual.