Have they worked since you've owned it? The lights are powered by separate sources, headlamps with the ignition, the rest without. Do the euro-park-lights work? How about the flass-to-pass high-beams?

Sounding a little like the light monitor module is the only common point, other than the headlamp switch, possible that either of these are loose from their electrical connector/plug?

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Gone to the dark side

- Jeff