I had the same affect you are wanting to achieve whilst retrofitting my auto lights/wiper ch/lh function. I had to add the required wiring and adjust the coding to get them working albeit all the time. If that makes sense?
Had a quick look and i didn't make a retrofit guide, although i do have the info on my laptop thats currently "a little unconscious in the processor department!" lol
Give the wiring ago as per the diagram and you should be golden. Any issues drop me a message and ill help where i can.
A quick pointer too, the rest of the wiring diagram for auto lights, rain sensor and auto dim mirror isn't 100% applicable for b7s. The diagram is for b6 models only.
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