- Edited
You have a CD player and the physical buttons are the CD player's own buttons which only control the CD player.
When you change the big screen car machine, the power supply and speaker cable to the CD host are disconnected, so the CD does not work, and the physical buttons that come with the CD player will not work.
If you want to keep the original CD host, it is estimated that you need to enter in the case of not unplugging the CD cable to modify their own flywire out to connect to the big screen car machine alone to be able to. This we do not have the technical conditions, you can study by yourself if necessary.