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.
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: