BMW sells a harness for pre-LCI cars (with adaptive xenon lights) listed as 'conversion, headlights xenon LCI'. I assume this modifies pre-LCI AHL harness to accomodate LCI AHL lights.
Part no. 61122149448
Does someone have a wiring diagram or install instructions for this?
Here's a photo I stole from Euroactive, who used to sell it on eBay ($150).