2010 ES350 Radio not working
 

My college son's radio is not working on his 2010 ES350 with touch screen navigation and amplifier 86280-33170. The touchscreen is working fine.

When you push the audio button on the side, FM, AM and Bluetooth are the only symbols on the touchscreen. Touching the symbols will lightly highlight the screen but, nothing happens. The volume control does not work by the knob or steering wheel.

The first time this happened, I disconnected the negative battery post and then when the radio rebooted everything was fine. Then about 1 month later, the ES350 did it again and now removing the battery post does nothing to help.

So far, I have checked the radio fuse and two amplifier fuses under the hood. I disconnected the battery. I also disconnected the amplifier and reconnected. I checked the ohm level on one amplifier plug to see if a speaker was shorted out (all read around 4 ohms). I have searched all over the internet and YouTube to see if anyone had the same problem.

Can anyone help me?