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. 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 that USB devices may work in newer vehicles, but not in order vehicles of the same model.
1. Turn the ignition switch to 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) (display is normal) troubleshooting 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) and turn on the audio system.
6. Check if the USB device can be operated with the audio-navigation unit (Folders or 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 7. If you cannot operate the USB device, go to USB device does not function troubleshooting Symptom Troubleshooting.�
7. Turn the ignition switch to LOCK (0).
8. 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 9.
NO -
USB device is faulty or not compatible. Also check the USB adapter 5P connector condition.�
9. Return to the customer's vehicle.
10. Measure the voltage between body ground and USB adapter control unit connector A (14P) terminal No. 1.
Is there battery voltage?
YES -
Go to step 12.
NO -
Go to step 11.
11. Measure the voltage between body ground and audio-navigation unit connector E (14P) terminal No. 1.
Is there battery voltage?
YES -
Repair an open or high resistance in the wire between the audio-navigation unit and the USB adapter control unit.�
NO -
Replace the audio-navigation unit Audio-Navigation Unit Removal/Installation (With Navigation).�
12. Turn the ignition switch to ON (II).
13. Measure the voltage between body ground and USB adapter control 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 control unit.�
14. Turn the ignition switch to LOCK (0).
15. Disconnect these items:
- Audio-navigation unit connector E (14P)
- USB adapter control unit connector A (14P)
- XM receiver connector A (14P)
16. Check for continuity between body ground and USB adapter control unit connector A (14P) terminal No. 2.
Is there continuity?
YES -
Repair a shot to body ground in the wire between USB adapter control unit connector A (14P) terminal No. 2 and audio-navigation unit connector E (14P) terminal No. 2.�
NO -
Go to step 17.
17. Check for continuity between audio-navigation unit connector E (14P) terminal No. 2 and USB adapter control unit connector A (14P) terminal No. 2.
Is there continuity?
YES -
Go to step 18.
NO -
Repair an open in the wire between the audio-navigation unit and the USB adapter control unit.�
18. Check for continuity between 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 control unit. Replace the affected shielded harness.�
NO -
Go to step 19.
19. 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 20.
20. 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 (With Navigation).�
NO -
There is an open in the wire(s) between the audio-navigation unit and the USB adapter control unit. Replace affected shielded harness.�