NO Sound JBL Radio No Volume display/Tune

I have a 2010 Toyota Prius III. JBL radio with JBL amp (86280-0W622). I purchased the car and the radio has power but no sound at all. From the JBL radio unit, I notice that the volume does not display any numbers when turning the volume knob, or using the steering wheel controls. Usually it would display "VOL ##" right?

Display of the actual volume level in numbers/??

Also the "Tune" button pressing it (treble and bass adjust) on the right does not function but turning the knob tunes the radio as normal.

Could this be an amp issue? I've purchased a used unit on eBay and have had the same symptoms.

And help or let me know if you have experienced this issue too.

Thank you

 

Anybody?

 

So I did a little bit of diagnosing. I looks like I may not be getting power to the amp. I did a bypass jump thur my amp and sound came thru the speaker that I was jumping. So it had to be the amp. I tested with a new amp and still didn't get any sound.

So I started with a volt meter:

From my pin coming in, I am getting a full 12 volts from the remote wire (Grey). But the "Constant battery power" i am getting 0 volts from. See the picture below:


Does this need constant battery power? Should I try to run a wire from the battery to see? Where can I check this short maybe? Man i am horrible with electricals.