If my key fob battery dies, I can insert it into a designed slot that is located under my armrest to start my car. My question is how is it sending a signal to the ignition to start? My key fob is 100 plastic with no metal contacts anywhere on its surface. So when I plug fob into designed plastic slot (under armrest) no electrical contact is made. How does it send signal?
There is a transponder antenna coil in the console slot that sends/receives a radio signal from the key. It works the same as a bladed key that has the transponder in the key handle.
Or the microchip in your dog that can be read when close enough to the scanner.
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So the transponder antenna coil in the console slot send a signal the the removable key in my plastic fob?
I don’t know for sure, but I assume it’s more or less this technology: