Prius V gen 3 dead radio SOLVED!

So my 2013 Prius V gen 3 non-JBL stereo went dead, DOA. It would display the Toyota logo at startup and then display "Power Off" in the upper left hand corner for a few secs then go to a black screen. It would do a few things briefly then revert back to black screen. The backup camera would pop on for a sec, if I pressed and held any of the buttons on the right, that feature would pop up then disappear.

My local dealer took a look at it & said the radio was shot & needed replacement to the tune of $1300. But the guy I dealt with was honest & said it really isn't worth it and Toyota has a problem with their radios. He recommended an aftermarket radio as a better option.

I wanted to retain all the functionality and the rear camera without installing an aftermarket rear camera. Ebay provided me with a used replacement unit. Today I went to install it and realized: 1) there is an extension module under the head unit and 2) the replacement had no extension unit. I removed my existing extension unit, installed it on the replacement and plugged everything in for a test. The behavior was unchanged. Brief operation & then dead screen. So I began to suspect the extension unit.

There are two wires that plug into the extension unit & a jumper from extension to radio. One dark grey plug going into the extension unit was the same as an unused port on the radio. So I hooked up everything but the jumper. The grey plug went into the unused port on the radio. IT FIRED RIGHT UP!

I now have all the functions I want and use: AM/FM, bluetooth, backup camera, car into and the steering wheel controls work. I lost: AUX, USB, APPS which I never use anyway. So big, big win. I am returning the Ebay radio.

The VERY Short Fix Summary:
1) disconnect the jumper between extension unit and radio
2) remove the darker grey plug from the extension unit and plug it into the matching radio port.
DONE!

I hope this simple fix helps some fellow Prius owners.