Audio completely died?

[atlauren]

Hi all! My CX-5 is a 2016.5 Touring.

Just lately, the audio function in my 2016.5 system has completely died. The control knob elicits zero response from the Music section of the display. No FM, no AM, no CDs, no ... any other audio source. Just before it went dead, the sound was garbled; it sounded kind of a like when someone butt-dials you and you get the sounds from their pocket.

Bluetooth still functions (attaches to paired phones), but no audio.

CarPlay functions and controls the phone as a a display, but no audio. If you start playing audio on a CarPlay app, it plays through the phone's physical speaker.

I've checked all three "Audio" fuses, and the "Bose" fuse. (My car doesn't have the Bose system. Why does it have a Bose fuse?)

Is this a head unit issue? A software issue? And amp / wiring issue?

Ideas welcome!

 

[N7turbo]

CarPlay functions and controls the phone as a a display, but no audio. If you start playing audio on a CarPlay app, it plays through the phone's physical speaker.

I am unsure how it would know to use the phone speaker. But in the case of a blown amp, you would have no change in operation other than silence or noise in the output. To me this points to the head unit.

 

[druiz35]

the amp in the non-Bose radio is actually in the radio. So you may have to replace the head unit.

 

[MzdCX_5]

Please No, it's not the head unit. It's the non-Bose amp (TAU). I powered the CMU on the bench and it acted exactly the way OP described it. No audio sources selection and CP audio played from the phone speaker. There's an independent CAN bus network between CMU and TAU necessary for the system to operate. Check for loose plugs at both ends but unfortunately, I believe it died.
It's located behind the glove box, get the part number and source one from Ebay, at around $100.