My car has some 3rd party I think called CARPLAY system installation from previous owner. I disconnected all the wireless pairings as I got annoyed everytime I switched car on my phones WiFi would connect to it automatically (it connects via Bluetooth and WiFi simultaneously). Now I’ve gone back to trying to use it I re paired the Bluetooth and WiFi all works Apple car play and the mirrioring feature works But no sound will come through the cars speakers I sat in my car for a few hours trial and error trying every setting alternative on the CarPlay settings and my iPhone settings but nothing seems to work very frustrating. I’ve contacted the people that installed it but they was not much help and they 400 miles away now.