I have the code, ive used it a number of times, but for some reason since the other day when the battery went flat the code i put in just wont get the radio to work....this is in my Eb Fairmont II late 93 model(sorry i forgot to mention this earlier) LoL anybody no whats going on with it?

somebody has to know whats going on?....maybe if i reset the ecu?....im trying that now...see wat happens i guess.