Hi you have a short your favourite place to look is the wipers relay they are more likley to short than the switch and there cheaper if no joy remove your steering wheel cowls so you can get at the switch find out which wire feeds the relay to turn the wipers on see if its permenantly live when you turn the switch off if so replace switch if the switch works as it should and the relays ok then the motors faulty yates210456
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So that wipers park properly, the wipers have 2 power sources. One is from the dash switch to turn the wipers no and off, but the second is the parking power, which is always supposed to be on. The parking power is supposed to be shut off by a rotating cam inside of the wiper motor housing itself. If you don't want to take it out and fix it, you could always just pull the parking wire to the wipers, and then try to manually park them by shutting off the wipers at exactly the right time.
Could be either one. The wiper switch could be providing power, and there is a park switch in the motor that provides power until the wiper arms "park". You may be able to disconnect the wiper switch to find out. Chances are you'll need a wiring diagram to test the circuits.
try changing the wiper relay first and check out the fuses if all is good then the motor itself may have seized or the worm drive may be worn or broken check the toothed spline where the wiper blade attaches the splines may be smooth or broken which will stop the blades moving back and forth
just a suggestion: remove the wiper transmission from the motor. turn the motor on, then off so it returns to the park positon and re-connect the trans to it, with the trans in the park position as well. then try it. (make sure the motor is properly grounded.)