HIDs shut off intermittently...need help! | 2008 IS350
It's unfortunate that this is my first post, but I would like to get input from the my.IS community.
I recently purchased a used obsidian IS350 from a local Mercedes dealership. The car is a one owner and appears to have been a road car based upon the front end rock chips and 68K on the odometer. Otherwise the car is in great shape and has had all regular maintenance done at the local dealer.
Recently, I have noticed that while driving at night, either (both on one occasion) of the HID headlights will switch off randomly. When I cycle the lights by turning the light switch off and back on, the lights will ignite. Sometimes they will remain on upon the second activation, or may shut off again. They also occasionally flicker slightly just before they switch off.
In my previous experience with HIDs, this would indicate some sort of voltage issue or issue with the ballast, not the bulb. My local Lexus dealer has recommended that I replace both bulbs, though I certainly will be doing it myself since I refuse to pay the $402.50 they would charge for the bulb replacement.
I do have an extended warranty, but the bulbs are not covered under the warranty, while the ballast are. Since the technician could not replicate the issue, he will not replace the ballast since he cannot confirm their failure to satisfy the warranty. The technician that performed the diagnostic on the headlight issue swore that the ballast were fine, but was unable to explain to me how he had tested them. That didn't do much for my confidence in his diagnostic skills. He also SWORE that replacing the bulbs fixed the issue every time he had experienced it before. It seems high improbable that both lights would begin to deteriorate at the exact same time.
Is this issue with the headlights common in the 2008 IS350?
I would appreciate any input on the remedy for the issue and how to appropriately present the solution to the dealership.
Thanks so much!