Symptom Troubleshooting

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.

- Check the connectors for poor connections or loose terminals.

- Not all players and player functions work with the USB adapter.

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 speaker(s).


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

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

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

6. Turn on the audio system.

7. Press the AUX button until USB appears on the navigation display.

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

Can you operate the USB device, and is the sound normal?
YES - Intermittent failure The USB device is OK at this time.

NO - If you can operate the USB device, but there is no sound, go to step 9. If you cannot operate the USB device, go to USB audio device does not work.


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 cable and USB adapter connector condition.


11. Return to the customer's vehicle.

12. Disconnect audio-navigation unit connector D (14P).

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

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

15. Check for continuity between audio-navigation unit connector D (14P) and body ground according to the table.





Is there any continuity?
YES - Short to body ground in the wire(s) between the audio-navigation unit and the USB adapter unit. Replace the affected shielded harness.

NO - Go to step 16.






16. Check for continuity between the terminals of audio-navigation unit connector D (14P) according to the table.





Is there continuity between any of the terminals?
YES - Short in the wires between the audio-navigation unit and the USB adapter unit. Replace the affected shielded harness.

NO - Go to step 17.






17. Check for continuity between audio-navigation unit connector D (14P) and USB adapter unit connector A (14P) according to the table.





Is there continuity?
YES - Substitute a known-good USB adapter unit, USB Adapter Unit Replacement (With Navigation) then reconnect all of the connectors, and recheck. If the symptom/indication goes away, replace the original USB adapter unit. If the symptom/indication is still present, replace the audio-navigation unit. Audio-Navigation Unit Removal/Installation (With Navigation)

NO - Open in the wire(s) between the audio-navigation unit and the USB adapter unit. Replace the affected shielded harness.