See also:

How to insert a CD (type A and C)
Hold a disc with a finger in the center hole while gripping the edge of the disc, then insert it into the slot (with the label side up) and the player will automatically pull the disc into position. ...

Rear seats
Seatbelts provide maximum restraint when the occupant sits well back and upright in the seat. Do not put cushions or any other materials between occupants and seatbacks or seat cushion ...

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 ...