hey there, thanks for the question.
the switch does function though? as in changing wiper speeds?
does the washer function work?
Then you have a short at the washer motor. It's sending a signal to have the wipers run like when you use the wash function.
This is why the switch is not working and why its at mid speed just like your washing the windshield.
as long as your model does not recieve the ground from the washer harness, you could simply unplug the washer motor in the meantime and it should operate normally minus the washer until you can replace it.
unplug the washer motor like i said previously.
absolutely, i'll be here when you return.