I had the fuse pulled because the self test thing was frustrating me. I put it back in, checked all of the resistances for the sensors, and went about my day today with no light. I'm assuming that having the fuse pulled had something to do with the tire pressure light coming on. Actually, the self test hasn't been making as much noise as it used to, so maybe I re-secured one of the wires while checking the sensors, as well!!