Quote:
Originally Posted by antman22
the fob works when in proximity of car. you could have the key sitting a couple feet away from teh car and it'll work. all the fobgina is there for is if the battery runs out, it supplies temporary power to get the fob working. it won't recharge it, but its enough to get the sensor to sync up and start the engine. you realize you don't have to put the key in the fobgina everytime you get in the car right? my keys always stay in my pocket.
i'm not sure what you're expecting out of an "intelligent" key, but that's about it.
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Its likely inductive coupling (kinda like the "wireless" chargers for the phone with 40,000 fart applications.... what's the commercial name? Oh yea the iPhone). It probably induces a current in a winding or trace on the PCB in the Fob when you place it in the fobgina. That gives the Fob power so the RFID can be transmitted to the ECU with a dead Fob battery. Its not a simple switch - its an inductive power supply.