Don't overlook the switch itself. Mine has the opposite function, The one touch auto works great, but the manual select doesn't. Pop the handle off, should just pull up. Put an ohm meter across the leads and see if it has continuity.
Its the easiest test and that way you can eliminate the switch.
The door harness is a huge problem on the Mk5 cars.
A 2007 golf I worked on had all other functions working great, except the driver window and speakers. I opened the door jamb rubber "tunnel" and found several broken wires.
Not that that's what is wrong with your car, but just something to keep in mind.