Low beam headlights do not work?

The two bulbs on the passenger side that are supposed to light when the low beams are turned on don't. There is power to the blue wire in the connector. I suspect there is a breakdown possibility somewhere in the headlight assembly. I tried to test for continuity from the connector to the bulb socket, but I don't understand the pathway for ground and current. These are HID lights. I also have continuity from the harness connector to the connection on the back of the bulb which is new. Hopefully your site will upload my photos. Apparently, it won't. I had this issue before, are others having the same issue?