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Originally Posted by JimSmith
Not sure if it has any electrical functions, as my "bad" key is really dead, electrically and it still works starting the car. Jim
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There are two independent functions in that key (not counting the mechanical blade). The RF transmitter (IIRC) and a transponder. The transmitter is battery-powered and serves the locking system. The transponder takes no battery power and is responsible for identifying the key to the computer. The transponder is powered by the ping from the car, and responds back. I assume that this part is hermetically sealed.