Happened to me and it turns out I did not fully seat the connections in the junction box inside the wheel well. It is a tight fit and just pushed harder until the plugs sat well
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2016 X5 35i F15 (Prod.date 2015-10-01)
2014 X3 2.8i F25 (Prod.date 2013-10-25)
2006 X5 3.0i E53 (Prod.date 2006-04-05)
2008 X3 3.0si E83 (Prod.date 2007-10-23)
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