USB Input Sound Is Low or Cannot Be Heard

Symptom Troubleshooting: USB input sound is low or cannot be heard

USB input sound is low or cannot be heard

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.

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

2. Do the speaker check mode with the self-diagnostic mode. How to Troubleshoot the Audio System

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

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

6. Turn on the audio system.

7. Press the AUX button until USB appears on the audio display.

8. 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 9.

NO - If the sound is normal, the USB device is OK at this time. If the USB device cannot be operated, go to step 9.


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

10. Connect the client'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 11.

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


11. Return to the client's vehicle.

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

13. Turn on the audio unit, and check for sound in each mode (XM and Bluetooth audio).

Is the sound normal?
YES - Go to step 14.

NO - Go to XM or HFL troubleshooting.


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

Is there battery voltage?
YES - Go to step 15.

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






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

Is there less than 0.2 V?
YES - Go to step 16.

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






16. 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 17.

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






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

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

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

20. Check for continuity between audio unit connector E (14P) and the 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, with ELS audio system, Audio Unit Removal/Installation (With AcuraLink) with premium audio system. Audio Unit Removal/Installation (With Premium Audio System)

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