* A theft deterrent system: Some aftermarket security systems might include a kill switch, often hidden and wired into the ignition system or fuel pump. If this is the case, you'll need to find the location of the switch, which is entirely dependent on how it was installed. The installer would be the only person who would definitively know where it is. This often involves tracing wires.
* A malfunctioning part: If the car isn't starting, it's not likely a "kill switch" but rather a problem with the starter, battery, ignition system, or other components. This requires diagnostics to determine the actual cause.
* A misunderstanding: You might be misinterpreting something else. If you can describe the symptoms (e.g., the car won't start, a certain light is on, etc.), a more accurate answer can be given.
In short: If you're having car trouble, it's best to take it to a qualified mechanic for diagnosis and repair. Attempting to bypass or disable unknown electrical components is dangerous and could damage your car further.
