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. Testing and Inspection
- Check the connectors for poor connections or loose terminals.
- Not all players and player functions work with the USB adapter.

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

2. Do the speaker check mode with the self-diagnostic mode Initial Inspection and Diagnostic Overview.

Do all speakers make a sound?

YES -

Go to step 3.

NO -

Go to no sound is heard from 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.�