B5 S4 - HID headlight non-functional

[Ti Kan]

Bob Gregory writes:
> One of my headlights stopped working today.  There is
> some condensation on the outer lens, no doubt related
> to recent adventures in the Floods of Ivan in the NE. 
> How to diagnose?  Searched the archives without
> successs.  Help!

Try running VAG-COM on the HID light module to see if there are
any fault codes.  Maybe the moisture has damaged the ballast or
the control unit.  Other than that, perhaps the bulb has been
blown and needs replacement.  You should clean the inside of the
light housing to remove all moisture.  This will probably be
difficult to do unless you remove the headlight housing from the
car.

-Ti
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