Quote:
Originally Posted by ajcarson11
PS: even if your fob battery is completely dead the door (and the start button) can send a tiny RFID signal to your fob to power it/unlock the door. This ensures that you don't become stranded if you have a dead fob. If you are waiting a long time for the door to unlock it is likely that the fob is eventually receiving power from the RFID signal (thus the battery isn't doing its job like normal).
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Thanks for bringing this up. Here
https://en.wikipedia.org/wiki/Radio-...identification
RFID tags contain at least three parts: an
integrated circuit for storing and processing information that
modulates and
demodulates a
radio-frequency (RF) signals; a means of collecting DC power from the incident reader signal; and an
antenna for receiving and transmitting the signal. The tag information is stored in a non-volatile memory. The RFID tag includes either fixed or programmable logic for processing the transmission and sensor data, respectively.
Is it possible that the key works for the rest of the day b/c it collected some energy from the reader (in the car) while I drive? Fascinating. Anybody knows about the details?