A couple of things come to mind, first is you have a relay sticking which will keep the washers going. Next is the BCM is having a problem. Here is a guide and a diagram (below) that will help you do some testing to see what the problem is and get it fixed.
Please run some tests and get back to us so we can continue helping you.
Cheers, Ken
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Jun 27, 2017 at 11:22 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.