Here is what I know.
I am pretty sure relay is fine. If I put my hand on the relay and have someone press the button inside, I can feel it click.
Now, does the relay provide direct power to the rear window defogger? I am guessing it does but I do not know for sure. According to the Haynes manual, there should be a light blue and white wires going to the rear window. Do these wires connect right to the relay? I guess one of those 2 wires is probably a ground.
How in the world do you find the wire going to the rear? where does it run. My car has the pioneer amp installed in the trunk, looks like I will have to pull that out of the way and maybe I can find the wire that comes down from the glass. Where it goes from there might be a different story.
Also, which side of the defogger is the positive side? My Silverado has power at the drivers side. Is the Cobalt the same way?
Thanks for the help.