see if this helps
quote from mitchell on demand
1. unplug wiper motor connector at motor. check for battery voltage at Violet/Black
wire. move wiper switch to lower speed position. volatage should be present at Black/White wire.
2. If voltage is present and motor is properly grounded, wiper motor should operate. if motor fails to operate, it is defective. Check fuses and wiring if no votage is present.
I would check the wiper control unit to see if it is pooched. a good voltmeter and a wiring drawing will help solving this prob.
I would send the files from this program but it has the copy function disabled and so far havent found anyone savvy enough to tell me how to defeat this option.