Symptom Troubleshooting

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

USB input sound is low or cannot be heard

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.

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).

- with navigation No Sound Is Heard From The Speaker(s) (Display Is Normal) (With Navigation).�
- without navigation 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 cable 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 or the audio-navigation unit.

7. Check if the USB device can be operated with the audio unit or audio-navigation 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 or audio-navigation unit connector E (14P).

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

11. Check for continuity between the terminals of audio unit or audio-navigation unit connector E (14P) according to the table.

Without navigation





With navigation









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.

- Audio: replace the affected shielded harness.
- With navigation: replace the dashboard wire harness.�

NO -

Go to step 12.

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

Without navigation





With navigation









Is there continuity?

YES -

Substitute a known-good USB adapter unit, then reconnect all of the connectors and recheck. If the symptom/indication goes away, replace the original USB adapter unit. If the symptom/indication is still present, replace the audio-navigation unit or audio unit.�

NO -

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

- Audio: replace the affected shielded harness.�
- With navigation: replace the dashboard wire harness.�