There is a BMW remote start if I read the book correctly. I think it has something to do with calling the car, and it starts (I think). I don't have my X5 accessory book with me, but I will go home and check how it works.

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2011 ///X5 M (On Order)

2009 X5 4.8 M Sport Space Gray/Black Fully Loaded

2007 GMC Yukon XL Denali Loaded and Customised