I believe this is a known BMW fault on some of their recent cars. I think the same thing happens on the E70 when it freezes and they have been replacing the parts under warranty. Search google for e70 headlight washers (I can't get the link to work) and there are a couple of relevant results (xdrivers and bimmerforums).
Another one under the title E90/E92 - Disappearing Headlight Washers on BMW Land
I expect there are many more examples of the same problem with the E90. Time for a call to the dealer and demand a warranty repair.
Steven Quas , Hamburg
Edited by Steven Quas on 29/01/2011 at 00:44
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