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. Testing and Inspection

- 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 Function. How To Troubleshoot The Audio System (Without Navigation)

Do all speakers make a sound?
YES - Go to step 3.

NO - Go to No sound is heard from speaker(s). Audio Unit Power Switch Will Not Turn On (No Information Display and No Sound) (With Navigation)


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 navigation unit.

7. Check if the USB device can be operated with the navigation 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 device does not function.


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

9. 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 10.

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


10. Return to the customer's vehicle.

11. Measure the voltage between body ground and USB adapter unit connector A (14P) terminal No. 1.

Is there battery voltage?
YES - Go to step 12.

NO - Repair an open in the wire between the audio-navigation unit and the USB adapter unit.






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

13. Measure the voltage between body ground and USB adapter unit connector A (14P) terminal No. 11.

Is there less than 0.2 V?
YES - Go to step 14.

NO - Repair an open or high resistance in the wire between the audio-navigation unit and the USB adapter unit.






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

15. Measure the voltage between body ground and USB adapter unit connector A (14P) terminal No. 2.

Is there 10 V or more present?
YES - Go to step 17.

NO - Go to step 16.






16. Measure the voltage between body ground and audio-navigation unit connector E (14P) terminal No. 2.

Is there 10 V or more present?
YES - Repair an open or short in the wire(s) between the audio-navigation unit and the USB adapter unit.

NO - Substitute a known-good audio-navigation unit Audio-Navigation Unit Removal/Installation (With Navigation) and recheck. If 10 V or more are present, replace the original audio-navigation unit. Audio-Navigation Unit Removal/Installation (With Navigation)






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

18. Measure the voltage between body ground and audio-navigation unit connector E (14P) terminal No. 2.

Is there 2.0 V or more present?
YES - Substitute a known-good audio-navigation unit, Audio-Navigation Unit Removal/Installation (With Navigation) and recheck. If less than 2.0 V are present, replace the original audio-navigation unit.

NO - Go to step 19.






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

20. Disconnect audio-navigation unit connector E (14P) and USB adapter unit connector A (14P).

21. Check for continuity between the terminals of audio-navigation unit connector E (14P) and body ground 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 unit. Replace the affected shielded harness.

NO - Go to step 22.






22. 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 unit. Replace the affected shielded harness.

NO - Go to step 23.






23. Check for continuity between audio-navigation 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-navigation unit. Audio-Navigation Unit Removal/Installation (With Navigation)

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