It's the motor. I had exactly the same problem with my 2000 Avalon XLS. I thought it was the switch so I changed that first. It had no effect. After I changed the motor, everything was fine.
it is possible
If intermittent wiper won't work either, it is most likely a bad wiper motor. Had a dealer replace the wiper switch, but that did not fix either problem. After dealer replaced wiper motor, problems were resolved.
There is a switch inside the wiper motor that identifies the home spot for the wipers. If you have intermittent wipers there is also a controller for that. Either can give you problems but more likely the wiper motor switch. The wiper motor switch usually is not a separate part (comes with wiper motor assy.) Oh yeah, 1 other thing, be sure the wiper arms are installed correctly on wiper motor.
Ford Motor Company
The motor needs to be replaced. There is a "switch" in the motor that "parks" the wipers. This happens when current is removed from the motor. Your "switch" in the motor is not allowing this to happen. Replace the motor.
The wiper motor has a switch inside of it. When they are turned off and the wipers go to the down position it trips the switch in the motor that tells the computer they are in the down position. If that switch in the motor is faulty, the wipers are repositioning until the switch is tripped to the off position. THE FIX.... Replace the wiper motor.
There aren't any switches to check/replace i.e. wiper switch, wiper relay therefore it must be a bad motor.
It is most likely the wiper stalk/switch. Try pulling the fuse for the wipers. If that stops them, then it is the stalk/switch.
I used to have this problem. The wipers would sweep at odd intervals in intermittent mode and when I turned the wipers off they would not go back in to the 'park' position (they would stop where I turned the switch off). The wiper motor has an issue with the brushes and contact assembly. Oil from the bearing coats the surface of the slip ring and causes intermittent operation. I removed the motor assy from my '96 caravan and cleaned the slip ring and brush with rubbing alcohol. The non-stop operation stopped as well as the 'ghost sweep' operation when in intermittent mode.
Check to see if the wiper motor has a loose or bad ground.
check the wiper fuse. then check the switch, then check the wiper motor
There is no switch. If the wipers park in the middle or at the top of the winshield you need to replace the motor. the fault is in the logic