[magic77]

Your spot on.

When I fitted xenon headlights to my e46 the headlight adjustment toggle did actually work manually. e90 as more things are than via electronis can see how that would not work. But then on e46 I didn't even have to code just stuck a in line capacitor and problem solved.. On cars with factory xenons you dont get a high adjuster it does it automatically using the two sensors on the suspension.

With high beam you are stuck as you cant even reuse the inboard units to create a high beam flash option. So looks like full wiring is needed as when you flash you need the bulb to ignite and the shutter to move. Something I hate as it kills the life of the bulb much prefer the old way for halogen to use as flash option

You will need to either Frankenstein a custom loom or wire it in properly and code as factory setup