What if there is no sound in car carplay navigation?

There are three ways to deal with the car Carplay navigation when there is no sound: you need to disconnect the phone from the car and reconnect it. After the phone is disconnected from the car, restart the phone and the car and reconnect them. Restore the in-vehicle system to the factory settings, and then reconnect the mobile phone. Carplay is an in-vehicle system released by Apple, which connects to iphone through USB. At present, it can support navigation, music, answering phone calls, short messages, podcasts, audio books and other functions. All functions in Carplay are linked with the mobile phone, and all controls can be input through Siri. At present, the car manufacturer brands that support Carplay mainly include Ferrari, Mercedes-Benz, Volvo and Roewe 360. This in-vehicle system is limited to IOS systems, IOS phones and IOS tablets.