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Symptom Troubleshooting




Audio System Symptom Troubleshooting - USB device does not function

USB device does not function (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.
- Check the USB device compatibility:
- Mass-storage class ready digital audio player with USB 2.0 port
- More than 256 MB of RAM
- Supports MP3, WMA, and AAC (encoded with the i-Tunes) files, DRM files are not supported

- 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 to ON (II).

2. Turn on the audio unit.

3. Press the AUX button to select USB mode.

NOTE: Do not connect the USB device.

Is USB NO DATA displayed in the audio display?

YES -

Go to step 4.

NO -

Go to step 9.

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

5. 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?

YES -

Go to step 6.

NO -

USB device is faulty. Also check the USB cable and the USB port condition.

6. On the customer's vehicle, remove the USB adapter unit USB Adapter Unit Replacement.

7. Disconnect USB adapter unit connector B (5P).

8. Check for continuity between terminals of USB adapter unit connector B (5P) and the USB jack 5P connector according to the table.













Is there continuity?

YES -

Substitute a known-good USB adapter, and recheck. If the symptom/indication goes away, replace the original USB adapter. If the symptom/indication is still present, go to step 10.

NO -

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

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

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





Is there battery voltage?

YES -

Go to step 12.

NO -

Check for an open or a short to ground in the wire between the audio unit and the USB adapter unit. If the wire is OK, substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom goes away, replace the original audio unit Audio Unit Removal/Installation.

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





Is there battery voltage?

YES -

Go to step 13.

NO -

Substitute a known-good USB adapter unit USB Adapter Unit Replacement, and recheck.

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

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





Is there less than 2.0 V?

YES -

Go to step 18.

NO -

Go to step 14.

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

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

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

17. Check for continuity between USB adapter unit connector A (14P) terminal No. 2 and audio unit connector E (14P) terminal No. 2.





Is there continuity?

YES -

Substitute a known-good audio unit Audio Unit Removal/Installation, reconnect all the connectors, and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation. If the symptom/indication is still present, replace the USB adapter unit USB Adapter Unit Replacement.

NO -

Repair an open in the wire between the USB adapter unit and the audio unit.

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





Is there less than 0.2 V?

YES -

Go to step 20.

NO -

Repair an open in the wire between the USB adapter control unit and the audio unit.

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

20. Remove the audio unit Audio Unit Removal/Installation, and disconnect audio unit connector C (14P).

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

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









Is there continuity between any of the terminals?

YES -

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

NO -

Go to step 23.

23. Check for continuity between terminals of audio unit connector C (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 USB Adapter Unit Replacement. If the symptom/indication is still present, replace the audio unit Audio Unit Removal/Installation.

NO -

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

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