Sure, yank the pressure line from the nozzle holder and pipe it out to spray on the windshield. Set the controller's initial trigger point to something way low. See if anything comes out. Of course, you could always put a multimeter or test light on the controller's output lines (that go to the pump). Is there any current or not? It's pretty simple.
P.S. Winter time is a perfect season to spray water/meth. Cold is great and COLDER is truly BETTER. There's no limit. For every 10degF drop in IAT you get about more hp out of the engine. Yeah, you feel a power loss when the temperature gets higher than what you're used to. However, you'll achieve a wonderful power gain when you drop it big time.