Is it after market? If so you may be in valet mode, there usually is a little toggle switch or red button down on the kick panel or on the back of the dash panel near your knees, turn the ignition to on, and press the button, usually ull hear a beep or at least your alarm led will turn off or on. If you know the model of your alarm please post i am a MECP Certified 12v tech. i install alarms and all that fun stuff all day.