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 navigation)

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. 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.

Is there sound from all speakers?

YES -

Go to step 3.

NO -

Go to no sound is heard from the speaker(s) No Sound Is Heard From The Speaker(s) From All Inputs (Display Is Normal) (With Rear Entertainment System And/Or 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 system.

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 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 control unit, 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 cable and USB adapter connector condition.�

11. Return to the customer's vehicle.

12. Disconnect audio unit connector C (14P).

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

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

15. 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 USB adapter control unit. Replace the affected shielded harness.�

NO -

Go to step 16.

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









Is there continuity between any of the terminals?

YES -

There is a short in the wires between the audio unit and the USB adapter control unit. Replace the affected shielded harness.�

NO -

Go to step 17.

17. Check for continuity between audio unit connector C (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.�