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Looks like a Body Control Module communication issue.
Windshield Washer
When the washer switch is pulled towards the driver, the SASM sends the washer request to the BCM over the LIN. The BCM activates the windshield wash relay (internal to the BCM) and sends a message to the driver side windshield wiper motor. When the BCM activates the windshield wash relay, voltage is provided to the washer pump, directing washer fluid to the windshield. When the switch is released, the windshield wiper motor continues to activate the windshield wipers for 3 additional wipes and then turns the windshield wipers off.
P1686 is a Transmission Control Module issue. You need an auto-electrician with a pro grade scan tool computer do diagnose why these codes are coming up?
Check the Fluid First, check that the windshield washer bottle has fluid and that ... If the pump is not heard, check the fuse panel to see if there is a blown fuse.
? 10:00
https://www.youtube.com/watch?v=0SdUhyQF4tY
Sep 9, 2012 - Uploaded by RatchetsAnd Wrenches
Here is a step by step guide to diagnose any trouble with yourwindshield washer pump, or other issues that ...
A 2012 should be under warranty . These cars have to be scanned when lights come on usually because of their computers. It could be as simple as a reset, but I would take it to the dealer, or try running the fluid low purposely, and filling it up again as they may have a float inside the washer resevior sticking, Toyota is good to fix their customers up, if all else fails, I would bring it in. Hope this was helpful
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