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I have a 2005 Cayenne S and the Nav thinks it is in the Atlantic Ocean. I get 0 Sat 0D-GPS on the info screen. Also the compass in the dash cluster always reads north. It still tries to navigate, but is several hundred miles off. I have checked the gps connections and they seem fine, but the compass makes me think that the GPS antenna may not be my issue. I believe it is pcm 2.1 as it uses nav DVD located under passenger seat. Any suggestions or help is appreciated.

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Sounds like your antenna or the fibre between the under seat unit and the PCM . Does the dvd eject ? if so take it out and then reinsert, if not you might have some sort of power issue to the unit or a blown fuse

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Yes DVD ejects and nav seems to work fine other than being in the incorrect location due to no sattelites and compass not sensing direction change. I wonder if there is any place where both compass and gps connections are located, and may have both come disconnected. Does anyone know the wiring path of both gps & compass? Perhaps there is a Shared wiring harness somewhere that I may have accidentally caused to disconnect?

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Sounds like your antenna or the fibre between the under seat unit and the PCM . Does the dvd eject ? if so take it out and then reinsert, if not you might have some sort of power issue to the unit or a blown fuse

Problem solved: It is either a defective gps antenna or the wire running to the antenna went bad.

I had previously tested the connections on the gps antenna under the rear spoiler, and the connections there were good, and the antenna unit was sealed and seemed fine. I purchased an antenna with the Blue FAKRA end on ebay for about $11 to plug into the nav unit under the seat to test. Didn't seem to work at first, but after about 15 minutes of driving it is working just fine. Now that it is working my next task is to run the wiring and mount it the new antenna. Thanks for the help!

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