Not sure if your unit is the same as this one on eBay. This suggests that if your car has the factory TV/NAV screen, the connector you are looking for is at the radio module in the trunk - you will need an extension cable to connect this.

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer