I have a 2002 DeVille DTS with rain sensing wipers. The wipers and washers do not work in auto or any manual position. I have checked the fuse under the hood (#3) and removed the wiper mechanism. After inspection, the motor appears to be fine. No visible damage to the circuit board. Is there any way to test the motor or the leads from the firewall to see if the problem is the motor or the switch? I am leaning toward the switch because the washer also doesn't work. This may be faulty logic though. I would appreciate any suggestion that may help me diagnose.