Check behind both the taillights behind the removable trim panels.

Check to see if any of interior carpet is damp or wet.

Check behind the glove box.

Check down by the driver's feet behind the trim piece in front of the door.

Check the DDE box.

Check these places for water or signs of wetted components or areas.

Also check and clean out your sunroof drains.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim