Electrical Gremlin n Modules

[Bmwtvboy]

I'm back. this time, the door carrier isn't engaging release, it seems to be broken again; cheap junk.
But, after removing the window switch module I have wonky issue.
All the windows went down n doors unlocked with the key fob. NOW, the drivers door doesn't work; no window down, no unlock. The two rear windows no longer go down. And the window switch module isn't working at all from inside. What is the number one cause / module of electrical malfunction in an X this old. All my modules are original. I disconnected the battery. Hopefully that resets the system.
J