One thing I have to clear is that I am not talking about car central locking system, I am asking for the working of a car burglar alarm which is when we opens that switch then only the car starts if we doesn‘t open it the car doesn‘t starts. I have to give a presentation on that so guys please help me with some material and pictures of it.
Opening a switch to start a car, implies the switch is closed, and drawing current when the car is not in use. Sounds like a recipe for a dead battery. If it is not creating a noise upon detection of theft, it's not really an alarm, but rather, a theft-deterent device. You could simply hide a switch under the dash, or seat, in series with the ignition control module. If you insist on open start, then you'd probably want that switch connected to an unused digital input on the engine control computer. The computer could read the bit, and see if it is pulled high by a resistor, or shorted to ground, by the switch. Assuming the engine's computer was easily programmable, you could write code to monitor the switch before starting.
Normally this type of alarm systems are regulated with the sensors and light to, whenver they detect something unauthorised they will get active and start making sound , Car burglar alarm is little bit different from it. From Guard Security System you can get this service of home security devices at the best pricre. GuardSys.
