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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. 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 that USB devices may work in newer vehicles, but not in order vehicles of the same model.

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

2. Do the Speaker Check Mode with the Self-Diagnostic Function.

Do all speakers make a sound?

YES -

Go to step 3.

NO -

Go to No sound is heard from the speaker(s) (display is normal) troubleshooting:

- With premium audio No Sound Is Heard From The Speakers (Display Is Normal) (With Premium Audio System).
- Without premium audio No Sound Is Heard From The Speakers (Display Is Normal) (without Premium Audio System).

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

4. On the customer's vehicle, connect the customer's USB device to the USB port.

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

6. Turn on the audio unit.

7. Press the AUX button until USB appears on the audio-HVAC subdisplay or the audio-HVAC display.

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

Can you operate the USB device, but there is no sound heard?

YES -

Go to step 9.

NO -

If the sound is normal, the USB device is OK at this time. If the USB device cannot be operated, go to step 9.

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

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

Is the USB device working properly in the known-good vehicle?

YES -

Go to step 11.

NO -

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

11. Return to the customer's vehicle.

12. Measure the voltage between USB adapter control unit connector A (14P) terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 14.

NO -

Go to step 13.

13. Measure the voltage between audio unit connector E (14P) terminal No. 1 and body ground.





Is there battery voltage?

YES -

Repair an open or high resistance in the wire between USB adapter control unit connector A (14P) terminal No. 1 and audio unit connector E (14P) terminal No. 1.

NO -

Replace the audio unit:

- With navigation Audio Unit Removal/Installation (With Navigation).
- Without navigation Audio Unit Removal/Installation (Without Navigation).

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

15. Measure the voltage between USB adapter control unit connector A (14P) terminal No. 11 and body ground.





Is there less than 0.2 V?

YES -

Go to step 16.

NO -

Repair an open or high resistance in the wire between audio unit connector E (14P) terminal No. 11 and USB adapter control unit connector A (14P) terminal No. 11. If the wire is OK, replace the audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).

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

17. Disconnect these items:

- Audio unit connector E (14P)
- USB adapter control unit connector A (14P)
- XM receiver connector A (14P)

18. Check for continuity between USB adapter control unit connector A (14P) terminal No. 2 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between USB adapter control unit connector A (14P) terminal No. 2 and audio unit connector E (14P) terminal No. 2.

NO -

Go to step 19.

19. Check for continuity between audio unit connector E (14P) terminal No. 2 and USB adapter control unit connector A (14P) terminal No. 2.





Is there continuity?

YES -

Go to step 20.

NO -

Repair an open in the wire between the audio unit and the USB adapter control unit.

20. Check for continuity between audio unit connector E (14P) and body ground according to the table.









Is there continuity?

YES -

There is a short to body ground in the wire(s) between the audio unit and the USB adapter control unit. Replace the affected shielded harness.

NO -

Go to step 21.

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













Is there continuity?

YES -

Substitute a known-good USB adapter control unit USB Adapter Control Unit Replacement, then reconnect all of the connectors, and recheck. If the symptom/indication goes away, replace the original USB adapter control unit USB Adapter Control Unit Replacement. If the symptom/indication is still present, replace the audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).

NO -

There is an open in the wire(s) between the audio unit and the USB adapter control unit. Replace the affected shielded harness.

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