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When the washer fluid gets low you will get a warning on the DIC. They have been known to send the message even when they are not low, so maybe the previous owner disconnected it, or had the tank out and forgot to plug it back in.
I just found this plug myself in attempting to get my windshield washers to work again. I plugged it in, turned on the car, and the washer pump runs non-stop without even turning on the wipers.
Did some research and found this is most likely a switch that has gone south or the wiper stalk. I just unplugged it and will just forget about it, if I can.