If the HID head lights are flickering or have failed, it may be caused by the window washer fluid leaking onto the HID modules. The washer fluid check valve for the head light washers develops the leak and drips onto the modules mounted under the head light assemblies.Google+
Car Problem Reports
Saab 9-5 Flickering or Failure of the HID Lamps
Saab 9-5 Problem
Average Mileage: 89,458 mi (35,000 mi - 164,000 mi)
Visitor, 2008 Saab 9-5, 72,000 mi
Headlight flickered and now goes out completely. I can turn the aswitch and it lights upo for a 30 seconds. When it is out both low and high beams are out.
Visitor, 2008 Saab 9-5, 89,305 mi
Headlight failure light comes on and headlights flicker. Replaced bulbs once but this did not fix the problem.
Visitor, 2007 Saab 9-5, 55,000 mi
just started to notice the flickering of both headlights. Bulbs have not died yet, but im taking the flickering as a sign that I will be having problems in the near future.
Visitor, 2008 Saab 9-5
Flickering driver side headlight.
Visitor, 2003 Saab 9-5, 164,000 mi
Visitor, 2006 Saab 9-5, 84,000 mi
Xenon Headlights turn off intermittently
Passenger sued headlight flickers regardless of low or high beam.
I was told by a mechanic that this is "typical" of Saabs and I should get used to it.
He added that it will be a lifetime of bulb changing and frequent stops by highway patrol for faulty headlights.
Visitor, 2006 Saab 9-5, 87,000 mi
Flickering started at 87K. Then it would flicker for a few minutes and then the pass side would go out, and a dash light would come on. It progressed over the next year (no, I didn't fix it and now the car has 105K on it) until both bulbs would alternate flickering and then go out. Time to fix it I guess. Inde Saab guy says it needs new bulbs - both sides at $190 each. Will report if problem not solved.
Visitor, 2004 Saab 9-5, 107,000 mi
Replaced both bulbs
Visitor, 2003 Saab 9-5, 92,500 mi
Flickering hid on drivers side