All you have to do is unlock the door with the key. If the alarm continues to go off after you have unlocked the door, then there is a problem with the door lock. Now if you have a trunk key, not a valet key, you can unlock and open trunk, then open the door, do not close trunk before you open the door and start the vehicle. Opening the trunk disarms the alam, but will reset as soon as you close. This is a quick work around the door lock issue should you have that problem.