I want to start a circuit in my car when I insert my key in car ignition and let it turn off when the key gets removed. I have Honda Civic 2007. Can someone just help me out as to from where do I take 12v connection which switches ON when a key gets inserted and switches Off when key gets removed. NOTE that I don't want to wait for a key to turn On the main ignition i.e ACC.
I'm sorry I'm not any expert in electronics or electrical system. I'm a professional software developer and this is my hobby project. Actually my car security system doesn't allow the ignition system to On until I press a provided button switch hidden in console below the steering wheel. So I got an idea to replace that switch with an RFID card system. My RFID card system was a success and I tested that and everything works fine. But my system is connected all the time since I connected it with the main 12v line. Which I don't want. I only want it to run when I insert key so I could touch card which will ultimately switches On the main ignition system. And then only turn my system Off when I remove the key from the ignition system.