USB Device Does Not Function

Symptom Troubleshooting: USB device does not function

USB device does not function

NOTE:

- Check the vehicle battery condition first. Testing and Inspection

- Check the connectors for poor connections or loose terminals.

- Make sure you have the client's USB device to use for testing.

- Some music players (connected through the USB port) may not work with all models.

- Make sure that the music player connected to the USB port works properly.

- The USB memory used for testing should conform to the USB mass storage class standard.

- The USB function is not compatible with a USB memory of 128 MB or below.

- The music must be saved to the player as WMA (Windows Media Audio) files or MP3. MP3 files saved in a variable bit rate are not compatible.

1. Connect a known-good music player to the USB port.

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

3. Press the AUX button, and check if it changes to USB mode.

Does it change to the USB mode?
YES - Go to step 4.

NO - Go to step 13.


4. Check that the client's USB memory device functions properly when connected to a known-good vehicle.

Does the music on the USB play?
YES - Go to step 5.

NO - The music player is either defective or incompatible.


5. Return to the client's vehicle with the client's USB and check if NO DATA appears when the music player is connected to the USB port.

Does NO DATA appear?
YES - Go to step 6.

NO - Go to step 9.


6. Check the connectors at USB adapter unit connector B (5P) and the USB adapter cable and the USB jack.

Are the connectors and terminals connected properly?
YES - Go to step 7.

NO - Repair the connection, and recheck.


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

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





Is there continuity?
YES - Replace the USB adapter unit USB Adapter Unit Replacement or the USB jack. USB Jack Replacement

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






9. Turn on the audio unit, and check for sound in each mode (AM, FM, XM, and CD).

Is the sound normal?
YES - Go to step 10.

NO - Go to no sound is heard from the speaker(s). No Sound Is Heard From the Speaker(s) (Display Is Normal)


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

11. Disconnect USB adapter unit connector A (14P) and audio unit connector C (14P).

12. Check for continuity between USB adapter unit connector A (14P) and audio unit connector C (14P) according to the table.





Is there continuity?
YES - Replace the USB adapter unit. USB Adapter Unit Replacement

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






13. Measure the voltage between USB adapter unit connector A (14P) terminals No. 1 and No. 11.

Is there battery voltage?
YES - Go to step 14.

NO - Go to step 26.






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

15. Disconnect USB adapter unit connector A (14P), navigation display unit 20P connector, HandsFreeLink control unit 28P connector, AcuraLink control unit connector A (32P), and XM receiver unit connector A (14P).

16. Check for continuity between USB adapter unit connector A (14P) and the navigation display unit 20P connector according to the table.





Is there continuity?
YES - Go to step 17.

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










17. Check for continuity between body ground and USB adapter unit connector A (14P) terminals No. 9 and No. 10 individually.

Is there continuity?
YES - There is a short in the wire(s) between USB adapter connector A (14P) and body ground. Replace the affected shielded harness.

NO - Go to step 18.






18. Check for continuity between terminals of USB adapter unit connector A (14P) according to the table.





Is there continuity?
YES - There is a short in the wire(s) between the USB adapter unit and the navigation display unit. Replace the affected shielded harness.

NO - Go to step 19.






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

20. Disconnect USB adapter unit connector A (14P), and the navigation display unit 20P connector.

21. Check for continuity between audio unit connector C (14P) and the navigation display unit 20P connector according to the table.





Is there continuity?
YES - Go to step 22.

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










22. Check for continuity between body ground and audio unit connector C (14P) terminals No. 9 and No. 10 individually.

Is there continuity?
YES - There is a short in the wire(s) between audio unit connector C (14P) and body ground. Replace the affected shielded harness.

NO - Go to step 23.






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





Is there continuity?
YES - There is a short in the wire(s) between the audio unit and navigation display unit. Replace the affected shielded harness.

NO - Go to step 24.






24. Turn on the audio unit, and check for sound in each mode (AM, FM, XM, and CD).

Is the sound normal?
YES - Replace the USB adapter unit. USB Adapter Unit Replacement

NO - Replace the audio unit. Audio Unit Removal/Installation


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

26. Disconnect USB adapter unit connector A (14P) and audio unit connector C (14P) [and XM receiver connector A (14P)].





27. Check for continuity between USB adapter unit connector A (14P) and audio unit connector C (14P) according to the table.





Is there continuity?
YES - Go to step 28.

NO - Repair an open in the wire(s) between the USB adapter unit and the audio unit.






28. Reconnect audio unit connector C (14P).

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

30. Measure the voltage between body ground and USB adapter unit connector A (14P) terminals No. 1 and No. 2 individually.

Is there battery voltage?
YES - Go to step 31.

NO - Repair an open in the wire(s) between the USB adapter unit and the audio unit.






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

32. Reconnect USB adapter unit connector A (14P).

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

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

Is there less than 0.2 V?
YES - Check pin fit and connection, then substitute a known-good audio unit, Audio Unit Removal/Installation and recheck. If the symptom/indication goes away, replace the original audio unit. Audio Unit Removal/Installation If the symptom is still present, substitute a known-good USB adapter unit, USB Adapter Unit Replacement and recheck. If the symptom/indication goes away, replace the original USB adapter unit. USB Adapter Unit Replacement

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