Audio quit working, what could be wrong?

Check whether the audio is muted by accidental press at remote control button. Enter its sound menu, and check it. If muted, as you know there will be no audio output. If not muted, check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/

check your fuses first .as it can be a failing bulb failure warning relay.

Check their website, most, but not all, have the option of 'siren', 'voice', or 'silent' for SAME alerts.

check shorted speakers or they are getting old and need replacing

The bluetooth and radio are located in the radio itself. I would suggest having the radio replaced at you local toyota dealership

wrong connection.

ghost

There might be something wrong on the volume dial, or the speaker connection.
SOLUTION: Check the speaker cables on the back.

your problem is in sound section only. 1 signal line for sound coming from vif section 2 supply to audio section. 3 component fail in audio output section. 4 loose contact in audio section 5 speakr & its connecting wire.

this problemis your amp is dead powerflux you need the asistance techinic