#5 is the ALC module...which you indicated you already checked. The link at the top of the diagram in my post above will take you directly to the part number index that gives the offical name (or at least what BMW calls it in the part number index).

And a simple google search using "BMW ALC issue" as the search phrase should brig up various threads were other bw owers have discussed this issue...and prbaby across multiple modules since adaptive HID lights are used across multiple BMW models...which adds more owners to the collective on this technology and issues/problems...the technology works thhe same across all BMW platforms. So this should bring common issues and solutions.

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