Originally Posted by
crymar
I know that the key fob for our cars contains both a transmitter and transponder that communicates with the car to create a no-start condition if an attempt is made to start the car with a non-original key. After reading the article about disassembling the key fob, it appears that there's no battery in it (or is there?). How does this communication take place? Doesn't the key fob need a power source if it's to transmit and respond?
After I wrote this I went to Wikipedia and got the answer by searching "Transponder Car Key." Very interesting. You can check it out at:
https://en.wikipedia.org/wiki/Transponder_car_key