Abstract: An automobile theft prevention system including a bistable switching device that receives a voltage input, delivers and controls a voltage output to drive an essential electrical circuit in the engine electrical system of an automobile. The system has circuitry coupled with the switches of the standard door switch circuit installed on automobiles associated with interior lighting. When a door is opened, circuitry of the system will be actuated thereby, to sequentially activate visible alarm devices, electrically shut down the engine and activate audible alarms. Entering a coded signal before opening a door prevents shutting down of the engine. When the engine shuts down by opening a door or by depressing a panic button on a code impulse device, it requires the entry of a coded signal to be restarted, as well as to turn off the visible and audible alarms.