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Originally Posted by MT-2500
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Thanks MT, here is another update. I could not find any Photocell information online because it is listed as a Sensor. A quick call to my local Dealership and found out that the GM part number is 12450120. It costs $14 USD. The unit itself has two wires and the actual sensor snaps on and off with a standard plastic clip found on just about all GM connectors. All that being said, it was not the problem. I replaced the sensor and still had the same issue with the low beams not wanting to light. I was giving up for the evening, pretty pissed that I spent the $14 and slammed the Hood shut, and the *#@&)#!% lights came on! I opened the hood back up and proceded to check the grounding wires. I found 4 different grounds, one on the negative battery cable to the block, one from the battery pigtail to the frame, another one from the second battery pigtail located under the passenger's headlight, the fourth one under the driver's headlight. All were tight and I tightened them again to be sure. The peculiar thing is that the High Beams work all the time when I pull the turn signal handle.
I am not sure if there are anymore grounding locations, any suggestions?
One thing the guy at the parts counter said was the ECM tells the headlights when to turn on and off. Where is the ECM Ground wire?