Q: The windshield wipers on my GMC SUV will not work when it rains but work fine when it is dry outside. What could be the problem?
A: General Motors (GM) had a recall for 2002-2003 mid-size SUVs for windshield wiper related issues. What may be happening is that water enters the wiper control module, shorting it out. Your vehicle may have a similar design. Call your dealer to see if your vehicle is covered under the recall. Technicians will inspect the electrical circuitry and may put a patch over a vent hole that is letting the moisture into the unit.