Symptom Troubleshooting

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.

- Check the connectors for poor connections or loose terminals.

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

2. Do the speaker check mode with the self-diagnostic mode.

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. Connect the customer's USB device to a known-good vehicle that equipped with the USB adapter, and check the USB device operation.

Is the USB device working properly?
YES - Go to step 5.

NO - USB device is faulty. Also check the USB cable and USB adapter connector condition.


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

6. Turn the ignition switch to ON (II) and turn on the audio unit.

7. 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 8.

NO - If the sound is normal, the USB device is OK at this time. If the USB device cannot be operated, go to USB audio device does not work.


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

9. Disconnect audio unit connector E (14P).

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

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





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

NO - Go to step 12.






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





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

NO - Go to step 13.






13. Check for continuity between audio unit connector E (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, 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 unit. Audio Unit Removal/Installation (Without Navigation, With Audio)

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