First of all, the mobile phone and the car Bluetooth device should establish a pairing relationship. Turn on the Bluetooth function of the mobile phone and the car Bluetooth device respectively, and set the Bluetooth setting of the mobile phone to "visible to all". Then search for Bluetooth devices in the mobile phone, and select the pairing connection after finding it. The pairing password is: , and the connection is successful after pairing. After the car Bluetooth is successfully connected with the mobile phone Bluetooth, you can make and receive calls. Play music on your mobile phone and enjoy music on your car Bluetooth device.

1. Other possible problems:

1. It may be that the volume is muted or not turned down very low. It is recommended to check the sound setting first.

2. The speaker may be broken, so it is recommended to send it for inspection and replace it.

3. The mobile phone system itself has a bug or the system is unstable. It is recommended to restore the factory settings and try. Either upgrade the system or refresh the firmware.

4. Check whether the third-party dialing software or music playing software causes conflicts. It is suggested to uninstall such software and try using the factory software that comes with the mobile phone instead.

5. Then play music to see if the link is successful.