There was a pretty heavy rain storm a few days before this video.
The car, bmw 530xit, the computers were acting all crazy, with the trac controls, abs, idrive~ pretty much everything, and bleeping that there was an issue.
Did some research and it directed me to a possible flooding in the trunk where all the electronics are located. At 1am I got the tools out and took some stuff off… and sure enough flooded battery compartment and trunk.
I pulled all the electrical stuff out to a drier location… but the water stayed till the next morning, and it was vac’ed up.
Tried looking for videos on what to do with flooding in e61~ and really got nothing, so hope this helps!
(this helped the most)
(didn’t really use this one, but might be helpful to some)