Hi,
I do not believe the selector switch has a replaceable resistor for speed selection. You can try turning your switch to low speed and testing for voltage signal at the wiper motor. If no voltage, turn to high. If voltage, either bad switch or broken wire in harness. Tilt steering wheel up and down with wiper speed on low. If you get any wiper movement, probably broken / shorted wire in steering column. If not, bad multi function selector switch. Switch is in the $200 range plus labor to replace.
If replacing your self, caution must be used to disconnect the battery and pull the air bag fuse, as steering wheel and air bag assembly must be removed in process and you do not want the air bag to accidently deploy. A great step by step video for replacement is here:
http://www.youtube.com/watch?v=Bkt9tfgJFdI
Please reply and let us know how you come out! Thanks, Mike
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