No wiring diagram; sorry. I used a more scientific method: I waited for awhile, until the light just went out on its own.

That was a perfect solution! ...until the light started blinking on and off again sporadically. I knew a tougher solution was needed...so I waited HARDER.

That seems to have done the trick, because the Winter Mode light has been contentedly dark for over a month now. Waiting seems to work. I also found that I didn't notice the light as much in the daytime, or when I was looking out the windows.

Regardless, it's out for now. Seems to be fine. Weird problem, huh?