Originally posted by fabbromix
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I've limited my response to your specific question about the famous wire 9 from the handle to the control unit BCM. Here's a wiring diagram that I developed some time ago that shows how the 9 wires are connected between the Euro-switch (what you call "the handle") and the BCM.

If your car wasn't factory fitted with the light (Rain/Humidity) sensor, then the missing wire would likely be the one that operates the AUTO function. As you can see from my picture, this is the connection to PIN #2 on the Euro-switch and the other end of the wire is connected to PIN #16 of Socket C on the BCM.
It's easy to find PIN #2 on the Euro-switch because the pin numbers are stamped on the base of the connector. The BCM connections are shown in the picture below

Good luck with the project
Don
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