Please give me details information about the fuse panels

Hello,

It is difficult to say what damage your car will suffer if you have water entry into the cabin.
If one or more electrical items are no longer working then please first check the condition of the fuses.

Locations of the 3 fuse boxes and which fuse powers which consumer can be seen below.

https://fuse-box.info/bmw/bmw-3-series-e90-e91-e92-e93-2005-2013-fuses-and-relay

How to test a fuse and how to replace a fuse can be seen in the below links.

https://www.2carpros.com/articles/how-a-car-fuse-works
and
https://www.2carpros.com/articles/how-to-check-a-car-fuse

Please let us know how you get along.

Cheers, Boris