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 12 Volt 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 customer's 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 older vehicles of the same model.

1. Turn the ignition switch ON (II).

2. Check to see if there is a specific speaker that has no sound.

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. 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 display.

8. Check if the USB device can be operated with the audio unit (Folders of 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 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 -

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

11. Return to the customer's vehicle.

12. Remove the audio unit Audio Unit Removal / Installation, and disconnect audio unit connector E (14P).

NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.

13. Disconnect USB adapter control unit connector A (14P).

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









Is there any 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 15.

15. Check for continuity between the audio unit connector E (14P) according to the table.









Is there continuity between any of the terminals?

YES -

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

NO -

Go to step 16.

16. 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.