fmugur, you may got the wrong model. The one you received may be fit for E53 2002-2006 with 40PIN connector and your X year is 2000 and it may needs the model for 2000-2001 with 16 PIN. Check with them again.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)