2012 Wiper+Wash goes on by itself

[lopat08865]

Originally Posted by CTScott

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.

Disconnected gray wire & will see if wipers ever come on by themselves. If yes then it's likely wiper motor, if no then likely a fault in the washer motor ground wire?

Disconnect of gray wire killed all washer function. Was hoping to find I could still use stalk to wash, followed by then using stalk a second time to do a wipe. Oh well.

But got me thinking, maybe I could splice in a toggle switch on the grey wire? Then, whenever I needed wash, I could toggle-on and use the stalk for a wash-and-wipe? Otherwise, keep it toggle-off, so I always maintain my access to wiper-only function? Any flaws or potential downsides you envision?

Thanks again, sir, as you saved me at least $107 for a dealer diagnostic, plus expectedly hundreds more for a fix. May ultimately end up surrendering to them for a fix, but in the meantime I have hope that, with your help, I can handle this myself for under $50 :-)