This video shows you how to get your touch tracer display steering wheel buttons to work again after installing an aftermarket stereo in a 3rd generation Toyota Prius. You need to run the pink wire to ground. There are at least two pink wires in this area of the dash. So it may take a couple of attempts before you find the correct one. This pink wire is located on the wide white connector which used to be plugged into the factory head unit.

A wiring diagram and detailed explanation can be found in ChapmanF's post in this priuschat.com thread.

https://priuschat.com/threads/steerin...