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 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 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 in USB devices working 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) (With 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-navigation unit.

7. Press the CD/AUX button to select USB mode.

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 can you hear the sound?

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

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

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









Is there continuity?

YES -

There is a short to body ground in the wire(s) between the audio-navigation unit and the USB adapter control unit. Replace the affected shielded harness.�

NO -

Go to step 15.

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









Is there continuity between any of the terminals?

YES -

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

NO -

Go to step 16.

16. Check for continuity between audio-navigation 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-navigation unit Audio-Navigation Unit Removal/Installation.�

NO -

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