2010 Yaris Windshield wiper malfunction

[WalterWhite61]

Wipers work only at fast speed and when turned off do not park. I read everywhere that this means its the switch. Installed a used switch and wipers did the same. Thinking that maybe the used switch had the same problem, installed a brand new switch - still the same !

Anyone ever run into this issue ?

I've been trying to get a schematic without buying a whole book. Does anyone have something they can share ?

I don't think the car computer has anything to do with circuit
I guess the wiper motor could be at fault but doesn't seem as likely for this type of problem.

Any help would be appreciated.

[bronsin]

Wipers don’t park. Does this mean they stop moving when you turn off the switch?

[BLH]

In my 2007 service manual. The wiper motor has two speed inputs. One for Fast and the other one for Slow. It also has a park switch in it. So it could be the motor assembly or the wiring harness that powers the motor.

[toyotavios_11]

it happens few times to me while wipers operate at full speed regardless the stalk input. Unplug and plug again the negative battery terminal solve my problem