On all 4 of those diagrams it shows 3 brown wires actually going to the headlight unit. They are all common Ground wires.
I can see from that statement that you don't understand how the wiring diagrams work. This is a nice simple one so I will attempt to explain.
View attachment 47733
The international standard used for the wiring designation numbers is DIN72552
http://en.wikipedia.org/wiki/DIN_72552
From the above you should be able to work out what color wire connects to what bulb and what pin.
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Karl.