Sounds like that one could be the switch. I would suggest taking the glass out and seeing if it works then. One other thing I noticed when I was working on my son's car is that once Itook the do apart, I noiced that one of the guides for the window had come loose and that might be he reason his original regulator went out. I had re-secrured the tracks and replaced the regulator ant was still binding. Once that was all done, I used that spray lube, and it worked line a charm.