Hi. I have an '05 XC90 with the factory fitted sat nav system, fibre optic version. At some time in its life the DVD unit , located under the passenger set, has been replaced with a second hand unit. (Without it in position the radio/CD or rear park sensor do not function either.) For wahtever reason this replacement unit won't seem to talk to the antenna and hence does not receive any satellite data. The system will navigate if you re-set the position using the wheel rotation sensor and compass but it is easily fooled and eventually loses its position, maybe it takes 50 yards or 300miles. Going into the diagnostics of the sat nav system reveals an error code of "DTC 3100: GPS (Open)". I saw you post and was wondering what options you could offer to get the sat nave system working? Many thanks, Nick.
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