Steps:
1. Connect the USB to RCA Adapter to one of the USB ports of the head unit.
2. Connect the Yellow RCA to 2nd Row and, if available, 3rd Row Male Yellow RCA from the Main harness.
3. If available, on the screen, look for "Car Setting" then "Rear Seat Ceiling Screen"
4. Put a check mark on the "Rear Seat Screen"
5. Choose "Aux" under Backseat Media Source
6. If there is no sound for rear seat entertainment, please also make sure 'AUX' app instead of 'Front Cam' is showing in the apps.