 And then they've just got a trigger wire that comes down from the control, and it just turns on and off. And the more it stays on versus off, the faster the blower will run. So what we can do is in the shop, we get our voltmeter out, and we put it on the pulse width setting after we've verified all those other powers, and we check and see, do we have a signal coming in? If we don't, we either have a broken wire between that module and the control and the dash, or we have a bad dash control.