I believe its behind the J pillar. by your left foot.
But it's more likely that you should find someone with a VCDS or even better, do an inspect of the wiring from the body to the door frame. About every item you mentioned except the wipers, operate through the door's wiring harness. That wiring has a really bad habit of breaking the insulation off and crossing everything up.
If you feel around on the bellows, there is a release tab at the top on the body. Pull the bellows back and check wiring. We have wiring harnesses for that job and even if you're good at it, it's a bit time consuming.
Fair warning, the door skin comes off, but look for a really good Youtube on it. Double warning, mark the screws that come out of the door skin for location. Some are different and if they go into the wrong spot, you end up with dimples in the door skin.