Hello, Recently I mislaid the second key for my car, I have now found it but it got me thinking about how this system works. I have found that the electronic part of the key can be taken off the key. I have started my car and then removed the electronic unit from the key to some distance away and the car engine keeps running so it only needs this part of the key to start the engine. The batteries in the key went flat some time ago and were removed so the key no longer works the doors etc. I assume that the electronic part of the key gets power from the wire ring that goes round the ignition switch then sends a return signal to the computer. As i used to be an electrical engineer and a radio amateur I am most interested to get more knowledge about this. I am now 84 so the knowledge that I have is a bit out of date. I am well able to build radio gear including transmitters receivers etc and my aim is to build a small unit that can replicate my car key but I do need more info. I know that one of you reading this will have that knowledge so please share it with me. There is a bunch of wires that go from the ignition wire ring to the computer so again I assume that the signal from the wire ring goes to the computer down these wires. I will get an old ring from a scrapped car and will open it up to see what is inside. Please do not tell me that I should not be doing this as I have no intention of using the information for any other reason but for curiosity.
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