Bumping this to post the ultimate solution to the headlight issue I was having.

It ended up being corrosion on the ALC module on my left (DS in the States) headlight. I ordered a used replacement off of Ebay, installed it and would still not get working ALC or low-beam. After months, I finally found that the ALC system had to be reset in INPA (ISTA could do it too I assume). After I reset the system I once again had working ALC (both leveling and directional movement). I was then able to remove my workaround wiring all together.

Hope this helps someone as I see non-func headlight posts come up every so often.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)