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I have high/low/fog 6000K 35w HIDs with LED Taillights with Hyperflash Harness on a '01 C5. I don't drive much.
However the last time I drove @ night the lights started flickering and the driver side low went dead. I purchased a replacement and install and the HID bulb did not work. So I move the "new" HID bulb to passenger side and it didn't work as well. I reinstalled the working HID bulb on passenger side and now that and all HIDs high & low on both sides are not working.
The HID Fogs work fine.
I removed the all high/low HIDs and replaced with the standard 9005 & 9006 bulbs and they work fine.
If it's the relay wouldn't the regular bulbs also not work?
Did you install a dedicated relay harness for the HID's? Assuming you did, and you plugged the 9005/9006 bulbs into the OEM connectors they would not be going through the dedicated relay harness.