Audi A3 8V S-Line Light & Rain sensor install

DenisOLeary

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Hello,

I am looking to install the Light & Rain sensor into my Right hand drive 2015 Audi A3 8v S-Line, I have checked and I don't have the wiring harness for the sensor so I have gone and ordered one online with the sensor and the automatic light switch,

I have the Xeon lights from factory
I have VCDS also (Offical cable)

I have also got elsawin but I don't understand the wire diagram that is on it , I have been told that I need to install them to the BCM but no idea what I am doing, so I have a few questions that I hope can be answered here.

1) Where is the BCM on the 2015 right hand drive Audi A3 8v S-Line?
2) Where do I plug the data lines into on the wire harness? (And the other cables)
3) What does the coding look like?

I have done a lot of googling and checking on this form, I can see people that say they have installed the wire harness but no one explains where it goes or how its installed.

Thank you