There is no a switch on the alarm system that can enable user to Arm and Disarm the alarm system. Usually, people can use keypad (need to input password), Keyfob, or send SMS to Arm and Disarm the alarm system. http://www.hkvstar.com/
Remove the fuse.
If it's the Hella system: Find the (black) fuse box under the bonnet in front of the battery. There's a separatly mounted flat fuse (apart from all the others). Remove the fuse and...
unplug the car battery this should reset the system. If it doesnt, i presume you do not have the remote for it? I assume the doors are locked also? put the key in the door turn it left, right, left....
Call the Police and they should be able to help you get in. If you are a burglar, then they probably wont help you, and your a bad burglar for trying to get the Police to help you rob a...