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I was using a 12v test light, and it lit that at the fuse - but there was no measurable power at headlight plug. So, somewhere between the fuse block and the end of the wireharness that pugs into the headlight nacelle there is a disruption in power. Could be a wire, could be the CEM - that's the question.
It is a ground wire and I found both ends of the ground, tested it for continuity and voltage and it seems to be good. It grounds the whole headlight assembly, and he high beam works just fine, so there is at least enough ground to run the low beam.
I did try jumping power directly to the headlight assembly to light specific bulbs, but there appears to be either some kind of sensor trickery that makes that a difficult task, or I was unable to sufficiently ground the assembly with a jumper wire.
The wiring harness dives down into the engine and disappears from view almost immediately after it leaves the headlight, so I'm having a hard time tracing it back - so I don't even really know if it goes to from the fuse to the CEM then to the light - but, as I said, there is something between the fuse and the bulb or the bulb would be on all the time, since the fuse seems to be always getting power from the battery - whether the car is on or not. (The fuse is getting power right now, while I type this, and the keys are in my pocket!) - so there is something between the fuse and the headlights, I just don't know if it's the CEM or some other relay. That's what I want to know. I think it might be easier to trace the wire if I knew where it went between the fuse the headlight.
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