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I am certain from what you have said you will have water in the HID unit which powers up the xenon bulb.
I had this with mine and when it dried out it would start working again, I have posted in this thread how to waterproof the HID unit which sits in a well under the headlight, there is a photo on there of the tide mark I had on mine.
Read all the posts in this thread, there are a lot.
Read the thread that also tells you how to do the repair and waterproofing.
It was about 20 months ago since mine started to not work after heavy rain and I repaired it, it has worked perfectly ever since.
Good luck with it.
A problem well stated is a problem half solved !
Currently in davesss's garage:
2002 Laguna Sports Tourer 1.8 Dynamique Moondust VF1KGOB, Fiat Siecento Micheal Schumaker, Kawasaki KLE M/Cycle and a cheap Mountain Bike.