2012 Wiper+Wash goes on by itself

[CTScott]

Originally Posted by lopat08865

Cancelled my diagnostic tom'w w/dealer. Back to CTScott's original plan to replace stalk 1st, then wiper motor if stalk replacement fails to fix [it didn't].

Figuring even w/rain, I can pull washer fuse & still drive w/wiper function. Saw no crimped wiring in engine compartment & way too much to tear-out-to-track-down the wire's full run.

Still thinking it's washer-switch electrical problem since BOTH go on intermittently.

But saw something here saying that switch inside motor fails to show ground at "park" [or bottom] position, so wipers keep moving until it finds it. So let's try that?

Still appreciate any advice on this thread. I will keep it open until solved.

Opened another thread looking for pdf/imagery/video/or just plain advice on how to get at the wiper motor in a 2012 Yaris H/B.

It is very unlikely the motor, as the wiper motor could not cause the washer to spray. If you want to definitely prove that, disconnect the grey wire in the smaller wiper stalk connector, which will prevent the backfeed from the washer motor to the wiper logic. When you do that the wiper will still work, and if the wiper does not pop on by itself you will verify that the problem is between the washer motor and the stalk.