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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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