My lights were stuck on. I could pull the HDM and they would go out. I was trying make sure the BCM was not holding the line low or a wire was shorted to ground. It was within a few years that I have replaced the HDM for lights not working. With your post of the actual pins (A12 is power,B12 is headlamp low beam,C12 is bcm lamp control, B11 is ground) that is what I needed. Before that I was trying to reverse engineer the schematic on the HDM, to figure out the pins. Which by the way after getting the information from you, I was able to confirm my BCM was working and no wires were shorted. Then again with your information, I ohm between 2 and 4 and there was a dead short. Then went to the parts store, verified the new one was open between 2 and 4 and it was. So $35 and I was fixed. I am so thankful God did answer my prayer :-).
Found it, got confused at first, it is exactly where you said, at first I looked up under the dash, but it more toward the rear, away from the firewall. After dropping the bottom panel, crawling under the dash, there is a connector that has a green lever that lifts the connector off of the BCM. I did not go any father since it was not my problem.
There is something I am missing here. According to the post with the pins (A12 is power,B12 is headlamp low beam,C12 is bcm lamp control, B11 is ground), which is correct, does not seem to match the two diagrams that I see in this post. In the 2006 and 2007 C12 goes to the headlamp fuse and it is the control from the BCM. Am I looking at the wrong diagrams?
Again, thank you so…….. much. You saved me lots of $$$$$$$$ :-)