Hi,
Just wanted to share what happened to my X5 after first heavy rain in BC, Canada. Water got in through the moonroof and it leaked through the left rear column, over the speaker, and over all of the electronics. What I noticed first was the smell of the moisture, then soon after the iDrive froze, so after researching online I decided to disconnect the battery in the order to 'reset' the iDrive. HA!
I still don't know what the total damage is, but will update the post when I find out.
Here is the video
https://youtu.be/PXXqWSvtG-c
Best,
Sin