I was going to try to walk you through the wiring diagram from fuse #8 ( American or Asian wiring diagrams are easy to explain), the Germans use what they call track diagrams which are harder for someone not familiar to tracing wiring diagrams to follow. If you felt comfortable trying to follow wiring diagrams, Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online but you may find it intimidating. One of the consumers you have mentioned is causing the fuse to blow. I would look for broken wires at the electrical harness between the door and door jamb. The driver's door is opened most often, put in a new fuse open the door and with both hands on the wiring harness wiggle the connection and see if the fuse blows, next try each window one by one and see which window may be drawing too much of a load.