1. First turn on the car audio system, long press the "mode" key on the audio host to enter the "Media" mode, use the "Tune" key or "Seek" key on the audio panel to select the desired The source of the music being played.

2. After selecting the music source, press the "Menu" button on the audio panel and select "Scan" or "Playback" and other options in the menu.

3. Finally, you can use the "Tune" key and "Seek" key on the audio panel to select music to play. If you want to pause playback or adjust the volume, you can use the corresponding buttons on the audio panel.