See also:

Ejecting all discs from the player (all disc ejection mode)
1. If you continue to press the “” button, the player will produce beep sound and will enter the all disc ejection mode. At this time, the disc number indicator and “ALL EJECT” indicator will flash. ...

When “CHECK DISC” is displayed
Press the eject button to unload the discs. Check that the disc is not damaged or scratched, and also check that the disc is inserted correctly. This message may appear when using some CD-RW discs ...

Precautions against vehicle modification
WARNING To avoid accidental activation of the system or rendering the system inoperative, which may result in serious injury, no modifications should be made to any components or wiring of the SR ...