i've checked the wiring i had tested the motor directly to the battery checked to make shore that nuthing was neir or broken on the wiper linkage and had the switch tested i don't know if it has a relay or not probable does don't know were to look
The problem is probably with the stalk control, which is the typical bunch of cheap plastic parts and can easily fail - OR with the wiring that leads to the same place. If the car was in an accident and the airbags deployed, this can damage the control and its wiring.
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