i have a lancer oz rally 2002 and this morning my car alarm just started going off. when i tried to use the car beeper it didn't do any thing i kept going off for about 20 min. when it finally stopped i had to use the key to open it. then it started again so i just started my car. and it stopped so i figured it was fine so i shut my car off. as i was walking away it started again. i couldn't get it to stop so i just disconnected the battery. what could be wrong with it?

 

aftermarket alarm?

 

yes it is not sure what brand though....might try to re wire it and if that doesnt work ill just rip that crap out