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Troubleshooting Guide
What might seem to be a malfunction in your unit may
just be the result of slight misoperation or miswiring.
Before calling service, first check the following table for
possible problems.
General
? The power does not turn ON.01
✔ The fuse has blown.
☞ After checking for short circuits in the wires, replace the fuse with
one with the same rating.
✔ No ACC position on vehicle ignition.02
☞ Connect the same wire to the ignition as the battery wire.
? Nothing happens when the buttons are pressed.04
✔ The computer chip in the unit is not functioning normally.
☞ Press the Reset button on the display unit (page 3).
? No sound or sound is low.52
✔ The radio volume is sets to the minimum level.3
☞ Turn the radio volume up.
✔ The input/output wire or wiring harness is connected incorrectly.55
☞ Connect the input/output wire or wiring harness correctly. See
"Connecting Wires to Terminals" (Page 20).
? Sound distortion.67
✔ The signal levels differ depending on sources.
☞ Change the Modulation level / Dynamic control setting. (Page 14)
? Nothing appears on the display.04
✔ The control output of the display unit is not connected properly.
☞ Connect the control output properly.
Sirius source
? The Sirius mode cannot be selected.2
✔ The Sirius connection wire is not connected.
☞ Use the Sirius connection wire to connect the control unit and the
Sirius satellite radio tuner.
✔ Connect the power supply of the Sirius satellite radio tuner.53
☞ Connect the battery wire and ground wire to the Sirius satellite radio
tuner.
✔ The Sirius satellite radio tuner is not connected properly.55
☞ Connect the Sirius satellite radio tuner directly to this unit.
? No sound can be heard, or the volume is low.58
✔ The input/output wires or wiring harness are connected incorrectly.
☞ Reconnect the input/output wires and/or the wiring harness
correctly.
? No broadcast can be received2
✔ The Sirius antenna is not connected.
☞ Connect it properly.
✔ No subscription is established.53
☞ Subscribe to SIRIUS.
? No sound is heard even though the information concerning the Sirius
satellite radio tuner is displayed.67
✔ The radio volume is sets to the minimum level.
☞ Turn the radio volume up.
✔ The microcomputer does not function correctly.68
☞ Press the Reset button of the display unit.(Page 3)
✔ The system is not connected properly.69
☞ Connect the system properly. See <Connecting Wires to
Terminals>. (Page 20)
KDC-C521FM_C471FM_(KE)_U.S 2004.01.16 10:51 AM Page 22