Symptom Troubleshooting

Audio System Symptom Troubleshooting - USB input sound is low or cannot be heard

USB input sound is low or cannot be heard (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.
- Not all players and player functions work with the USB adapter. Please see the Owner's Manual for more information. Always test the customers USB device in a known-good vehicle of the same year and trim (if possible). Technologies change and are updated frequently which may result in USB devices working in newer vehicles, but not in older vehicles of the same model.

1. Turn the ignition switch to ON (II).

2. Do the speaker check mode with the self-diagnostic mode.

Do all speakers make a sound?

YES -

Go to step 3.

NO -

Go to No sound is heard from the speaker(s) No Sound Is Heard From The Speaker(s) (Display Is Normal) (Without Navigation).

3. Turn the ignition switch to LOCK (0).

4. Connect the customer's USB device to a known-good vehicle (same year/trim) equipped with an USB adapter, and check the USB device operation.

Is the USB device working properly?

YES -

Go to step 5.

NO -

The USB device is faulty. Also check the USB adapter and the USB adapter connector condition.

5. On the customer's vehicle, connect the customer's USB device to the USB adapter.

6. Turn the ignition switch to ON (II), and turn on the audio unit.

7. Check if the USB device can be operated with the audio unit (Folders or Files UP/DOWN, etc.).

Can the USB device be operated but no sound is heard?

YES -

Go to step 8.

NO -

If the sound is normal, USB device is OK at this time. If the USB device cannot be operated, go to USB audio device does not function Symptom Troubleshooting.

8. Turn the ignition switch to LOCK (0).

9. Disconnect audio unit connector C (14P).

10. Disconnect USB adapter unit connector A (14P).

11. Check for continuity between the terminals of audio unit connector C (14P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wires between the audio unit and the USB adapter unit. Replace the affected shielded harness.

NO -

Go to step 12.

12. Check for continuity between audio unit connector C (14P) and USB adapter unit connector A (14P) according to the table.









Is there continuity?

YES -

Substitute a known-good USB adapter unit USB Adapter Unit Replacement, then reconnect all of the connectors and recheck. If the symptom/indication goes away, replace the original USB adapter unit USB Adapter Unit Replacement. If the symptom/indication is still present, replace the audio unit Audio Unit Removal/Installation.

NO -

Open in the wire(s) between the USB adapter unit and the audio-navigation unit or audio unit. Replace the affected shielded harness.