Poor button contact and improper software settings.

1. Poor button contact: When the internal button contact is poor, the adjustment buttons on the steering wheel cannot be used. When the navigation steering wheel cannot switch songs, you can remove the buttons and then clean them. The location of the contact point is enough.

2. Improper software settings: You can check whether the "Support Bluetooth operation" option is not turned on after the music software is updated. If it is turned off, the navigation steering wheel cannot switch songs.