Thanks, Ortho, for posting the DIY of the bulb changeout. Will no doubt help someone. Unfortunately, my bulb is not the problem, so proved by swapping the bulbs L&R. Finally last night I probed the wiring harness with a volt meter and found that I do have 12V going to the headlight assembly (15V, with the motor running -- wow!). Pretty certain that means it's the ballast. I haven't been able to get the headlight assembly out to access the ballast. I've read that some say I must remove fender & bumper cover, while some say it's not necessary. I've unbolted the fender but it doesn't budge. I can see the ballast on the bottom of the assembly, but I don't think I can get to all the screws and change it out unless I remove the assembly. I'd like to be able to remove it anyway to replace the lenses (found a good deal on those, so I want to replace rather than refinish). So wish I had a DIY video on removing these headlight assemblies!

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2009 X5 3.0
2001 X5 4.4 - Sold