So i bought a 4th gen with a viper alarm pre installed on it and just yesterday started having problems with it. the car locks fine and the alarm chirps but when i hit the unlock button the doors don't unlock and it seems like the factory alarm starts going off even tho the guy i bought it off of says he watched them take the original unit out. After about 10 minutes of my horn going off i figured out that if i unlock the trunk the alarm stops and i can start my car. its worked fine since i got it and now im stuck any ideas?