Okay, so I got the problem sorted 🙂
The previous owner installed a custom sound system with subwoofer, and in the process he disconnected a connector leading to the driver door, but never reconnected it afterward! This resulted in the the entire door electronics to lack the sufficient amount of power...
After reconnecting this connector all problems were fixed, thankfully!
Thank you all for the help, I really appreciate it!
I will do the proxy alignment myself some time next week, just to be sure, because I want to make sure the car is in good shape.
The motors and regulators are practically new btw, and they indeed did not fail.
(Probably previous owner had also been struggling with this problem, but never figured out what he forgot 😝
(And there’s no way I’m selling her now haha)
Thanks for the tip on the software though!!
Do you have any recommendation on a usb to obd2 connector to use with this software?