I'd start with checking the GM3, its the big white box sitting just behind the glove box. I believe there are 3 wiring harnesses that are plugged into it.

-This site shows you how to access the module: BMW General Module 3 removal E39 5-series
Click the link at the bottom of that page labeled, “BMW General Module III (GM3) Page” to learn everything there possibly is to know about BMW GM’s.-

That's where all the signals are sent for things like the windows and mirrors. It’s possible it has gotten wet due to seals leaking overtime or possible sunroof drain malfunction. Also a good place to look would be under the passenger side carpet, there is a fuse box that is known to rust over and cause all sorts of electrical mayhem.

You can find the description and location of said fuse box in this thread made by the notorious @bluebee : https://www.bimmerfest.com/threads/.../picture-amperage-description-of-every-single-fuse-relay-in-the-bmw-e39.679306/

 

I will definitely look into all of those fuse/relays and connections to gm3 module

 

Hope that helps, or at least gets you started on the right path. Keep this thread updated with any news on the situation. I'm sure other, more experienced, users will be along shortly to provided additional/more specific information if needed.

Our cars are works of art and they all deserve to be in their best possible condition. 🤙🏼

 

How long have you had the car?

You do know there is a button on the master window switch panel to shift the control between the left and right mirror, yes?

It almost sounds like the driver's door lock is faulty for starters.

Did the windows use to roll down from the master control?? Is the window defeat button engaged?

 

Yes, i tried replacing the whole driver's door and the issue remains, I'm convinced that the issue is in the wires/connections to the driver's door but which ones I have no idea since there are so many

 

Check the rubber covered bundle that passes between the main car body and the door itself. A wire or two may be broken in there.