Take a look at this, I sold my X5 a couple months ago but like to pop on here from time to time as I enjoyed being a member on this forum. I saw this and I remembered I experienced something very similar, hope it can be of some assistance.

https://xoutpost.com/bmw-sav-forums/...ne-wiring.html

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2004 BMW X5 4.4i-Sports Package-Premium-140,000 Miles