i see. Didnt notice that when I did my ballast.

I presume there will be one for each headlight? Maybe you can swap the modules left to right to see if the problem switches sides to confirm?

Also, I suggest checking the headlight wiring, as the insulation likes to crumble. Might be directly or indirectly part of the problem.

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04 X5 3.0i auto
03 X5 4.6is