Symptom Troubleshooting

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

USB input sound is low or cannot be heard (with premium audio)

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) (display is normal) troubleshooting No Sound Is Heard From the Speaker(s) (Display Is Normal) (With Premium Audio).�

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

4. On the client's vehicle, connect the client'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 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 USB device does not function troubleshooting Symptom Troubleshooting.�

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

10. Connect the client'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 client's vehicle.

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

13. Turn on the audio unit, and check for sound in each mode (XM and Bluetooth audio).

Is the sound normal?

YES -

Go to step 14.

NO -

Go to XM or HFL troubleshooting.�

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

15. 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 17.

NO -

Go to step 16.

16. 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 the USB adapter control unit connector A (14P) terminal No. 1 and audio unit connector E (14P) terminal No. 1.�

NO -

Replace the audio unit Audio Unit Removal/Installation.�

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

18. 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 19.

NO -

Repair an open or high resistance in the wire between USB adapter control unit connector A (14P) terminal No. 11 and audio unit connector E (14P) terminal No. 11.�

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

20. Disconnect these items:

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

21. 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 22.

22. 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 23.

NO -

Repair an open in the wire between audio unit connector E (14P) terminal No. 2 and USB adapter control unit connector A (14P) terminal No. 2.�

23. 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 Audio Unit Removal/Installation.�

NO -

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