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 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 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 USB/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 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. Disconnect audio unit connector C (14P) and audio display-USB adapter control unit connector A (32P).

13. Check for continuity between audio unit connector C (14P) and audio display-USB adapter control unit connector A (32P) according to the table.













Is there continuity?

YES -

- With XM receiver: Go to step 14.
- Without XM receiver: Go to step 15.

NO -

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

14. Disconnect XM receiver connector A (14P).

15. Disconnect the HandsFreeLink control unit 32P connector and XM receiver connector A (14P).

16. Check for continuity between body ground and audio unit connector C (14P) 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 audio display-USB adapter control unit. Replace the affected shielded harness.

NO -

Substitute a known-good audio display-USB adapter control unit Audio Display-USB Adapter Control Unit Removal/Installation, then reconnect all of the connectors, and recheck. If the symptom/indication goes away, replace the original audio display-USB adapter control unit Audio Display-USB Adapter Control Unit Removal/Installation. If the symptom/indication is still present, replace the audio unit Audio Unit Removal/Installation.