I am using the original key but it has not been exposed to any water.

One thing I haven't done which I avoid if at all possible is to try to find the wiring schematic in the handy dandy Bentley service manual. I take a look at that when I get back from the North woods.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas