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I got a 2001 TA and found I have no bright or dim on the drivers side only. The headlights go up and down fine and the passenger has high and low beams functioning. Checked bulbs and they are good, even tried swapping them. I checked for a fuse but all seems good. Tried researching and find to check fusible link, but not sure I found the right things...3 wires in pic to follow, correct?.... and I saw reference to a relay, but I do not see one.
Well i found my plug had been hacked off at some point and this in its place. I do not think it is the cause though because for 2 years it has worked fine and now it just like a fuse is blown and no power to either high or low on DR side. The connections are all tight and look clean other than tape residue since they had it wrapped really well.
So frustrating. I thought when I swapped the gear in the headlight motor last year I was done with headlight issues.
You'll need to take those connectors apart and confirm. The two to your motor are obviously fine. You likely have a problem with the ground wire if your bulbs are good - but you can check all three wires to confirm.
There are also a number of other relays and modules upstream of this that could cause issues, but this is the place to start in tracing the problem. (Measure for 12V from the two bulb wires to the ground wire and then from the two bulb wires to the body.) If you don't have voltage at the connectors, then you can register on AutoZone.com and download the lighting schematics for the car.
From: Jacksonville, FL (originally from Toronto Canada)
The first thing that comes to mind is the ground. The headlights have separate left and right ground points on either side of the radiator mount. If the ground on the left was bad (corroded, disconnected, broken wire, etc.) you would have both high beam and low beam quit on that side while the other side still worked.
The ground looks great, but I will double check it. The connectors seemed good when I took them apart.
I do occasionally have a grinding from the gear replacement on the driver side, but it has been going on 6 months. The lights always turned on, just would occasionally not flip up. However could the module be bad or confused by this? I do not think it is capable of not turning on the lights due to position.
Thanks for the input. I will do some testing tonight
I tried searching through all of that and it seemed to concentrate on motors which was not my issue, but if this needs tossing into that thread...I completely understand.
I am not great with electrical nor the diagrams, but will try to use that to work through. Thanks
I tried searching through all of that and it seemed to concentrate on motors which was not my issue, but if this needs tossing into that thread...I completely understand.
I am not great with electrical nor the diagrams, but will try to use that to work through. Thanks
Sorry - that diagram was confirming that your problem was not the headlight door motor control and I was pointing out where you can get the schematic for that.
You just have to undo those connectors at your motor and start tracing.
I figure to create/test a new ground before tearing into wire bundles and check it. Dang kids just need to give me the garage time.
Since I do get the occasional grinding even with the brass gear in there, I will take the motor for up/down out and see whats up with it too. Hoping I can get it all working this weekend and not have to mess with it for a good while.
It's a brutal cycle with these things. The brass gear is not a silver bullet as the design of the unit is flawed in general. (The motor comes detached from the gear housing and will also grind metal gears.)
I've had a good long run of peace and quiet with mine, but I had to completely replace the motors with the new Cardone units.
Well it was rather anticlimactic. However, i hate when people do not follow up to report results, so here it is.
I got the "fix" of the connection for ground and power all undone and tested a new ground, no dice. I unhook everything and plug em back in, boom. I got lights. Find the cheap connectors used on the hot wires to both lights are loose. I pinch em tight and taped them up until I can pull the bumper and get some better connectors to fully replace them. Why they used two connections and such crap on the hot wires when the grounds they twisted together are still good makes lil sense.
I appreciate all the ideas and help working through this. Was nice to have fully lit car in the snow this morning.
I do think I may buy a new motor for the lights on that side and install when I do the wiring since it does grind. They really are not too expensive.
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No driver high or low beam 
but I wish you the best of luck.