That's not really a water pump light. That is the coolant level light, and it goes off when the sensor in the resevoir detects the level to be too low. In our cars the sensor is a little over zealous. If you fill the coolant level to be about a half-inch over the max line it should take care of the problem.
This is also detailed in the FAQs:
http://www.contour.org/FAQ/FAQ.php?s=probs&displayid=21 
