The USB disk format is not supported, the USB disk stores information abnormally, and the volume setting may be turned off.

1. The USB disk format is not supported: The music file type in the USB disk may not be supported by the car audio. Car audio generally supports common audio formats such as mp3, wav, etc. You can check the user manual of the car audio for supported audio formats.

2. Abnormal information stored in the USB flash drive: Abnormal data on the USB flash drive will also result in the inability to play it on the car audio. When inserting the USB flash drive, it is recommended not to pull it out and use the backup data as much as possible to avoid data damage and failure to play normally.

3. The volume setting may be turned off: In the settings, there may be mute or volume setting turned off. You can try adjusting the volume and mute switches to see if you can play music normally.

The Subaru XUV is a small crossover SUV manufactured by the Japanese car brand Subaru. It was launched in China in 2019 and is one of Subaru's new models.