I've had this happen a few times, then the next day or next time I restart the car, it works again.
And at times if the system is on for a while, in an underground carpark or somewhere that no sat contact is available, once you're back outside again, it can still take a little while for the system to try again and contact satellites...
That happened to me too, my car was buried about a foot of snow for a couple of days, and when i finally dug it out the GPS light never came on. It was like that for about 2 days before it thawed or whatever and works fine and i always have a signal.
Um. it ,might be as simple as the antenna coming unplugged from the back of the nav computer. You have to take the seat out and the metal bracket to get to it though, so I would take it to the dealer.
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