Why there is no sound when playing music through Bluetooth:

1. The volume on the car navigation system or mobile phone is not turned on; enter the phone settings, sound, find the media option, and open the media volume. The same goes for car navigators.

2. Some mobile phone music player programs are incompatible with the docking codes of certain models. You can only answer calls but not listen to music; the solution is to change the Bluetooth playback frequency band so that it can be used normally;

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3. The car Bluetooth multimedia music is not turned on; the solution is to find the multimedia option on the screen and select Bluetooth to play music.

4. The media audio on the mobile phone is not turned off, causing signal interference with the Bluetooth function; the solution is to enter the Bluetooth settings interface of the mobile phone, turn off the media audio, and retain the mobile phone audio.

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