Hi everyone bought my RS4 B8 few months ago and was told it had high beam assist and guess what it didn't

It has been bugging me for ages now and cant find anything very helpful with regards retrofit for this.

Any idea what needs to be done and what i need to buy and do to make it work?
Cost & part numbers would be great.

Car already has lane assist and dimming mirrors and stalk to high beam assist.

When i activated it via VCDS it comes up fault on high beam assist

Thanks
Kam