2 of the errors causing parasitic drains on my X5 were first the final stage resistor and then the telematics module causing the X5 to not stay in sleep mode. If your X5 is an post 2002 automatic transmission just look in the window and make sure the light next to park is out. If it is on the system is awake. If your interior AC fan is not acting strangly them try pulling fuse 74 in the rear hatch area and see if it is your telematics module. When mine went bad I had a small light on my business radio indicating "no service". There are a few threads here dealing with this.
https://xoutpost.com/bmw-sav-forums/...elematics+fuse