To use USB to play music in the car, you only need to plug the external storage device directly into the vehicle's USB interface with a data cable. At this time, the vehicle will automatically enter the music playback mode. 2 How to use USB music in the car The following is an introduction to the car: There are generally two ways to plug in USB in the car. One is to directly insert the external USB disk; the other is to insert the external memory card. If the music player's built-in socket is damaged, you need to buy a suitable external socket from an auto parts store. 3. How to use USB music in the car. There are various models of music players, but the functions are probably the same. Generally, the music playback function will be clearly marked on the interface.