Cable between radio and CD changer, checking

• Switch radio off.
• Simultaneously press and hold MODE button (Concert radio) or button no. 4 (Symphony radio) on radio while turning radio on.
• Release buttons.

If the cable connection is OK: 

The radio display indicates: "CONCERT" and "CD."

If the cable connection is NOT OK: 

The radio display indicates: "NO CDC."

• Check electrical connections on CD changer.
• Repeat check as described above.

If not OK:

• Check wiring connections. See SYSTEM WIRING DIAGRAMS .