Why doesn't bluetooth audio work with my car stereo?

[Cristian M]

I have Samsung Galaxy A3 (2017) (model SM-A320F) phone with Android 7.0. The problem is that after successfully pairing (Bluetooth) with my car stereo (Sony DSX-A400BT), when I receive a call, I cannot hear any audio, neither the caller.

In the call menu, the Bluetooth icon is selected. It works if I press twice the icon, to deselect BT and select it again. My previous phone, did not have any problems. Also, if I use a Bluetooth headset (Samsung Mono Headset HM1100), it works fine.

I've tried the app Mono BT router, but it keeps the stereo always on BT audio and I want to listen to the radio and let the phone automatically switch to BT audio only when a receiving a phone call. I've tried SoundAbout app, but it does not work.

Is there a solution to get BT working correctly?

 

[dontpanicbobby]

Turn up the volume in your car on
HtH

 

[Dannydet]

Each car manufacturer builds Bluetooth into their vehicles differently year by year.
Case in point: I own 2 Chevy Trax, a 2016 and a 2018. The 2016 connects and plays music and phone calls with no issues. The 2018 has been nothing but issues with Bluetooth.
At this point, I have absolutely no trust with any car company and Bluetooth, ever.

 

[Cristian M]

Turn up the volume in your car on
HtH

It is not a volume problem. I cannot hear the caller, nor can he hear me.

 

[Dannydet]

Check your Bluetooth connection on both phone and car, be sure audio and calls are checked...

 

[Cristian M]

Check your Bluetooth connection on both phone and car, be sure audio and calls are checked...

I confirm they are checked. Also, when answering a call BT is selected and the tuner switches to BT audio, but no sound is heard.

 

[Dannydet]

My conclusion with Bluetooth on all vehicle makes is just downright hit or miss, from brand to brand per phone.
Good luck.