Audio System Symptom Troubleshooting - USB input sound is low or cannot be heard
USB input sound is low or cannot be heard
NOTE:
Check the vehicle 12 volt battery condition first.
Check the USB device's volume settings.
Not all players and player functions work with the USB adapter. Please see the Owner's Manual for more information. Always test the customer's 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.
Check the connectors for poor connections or loose terminals.
1.
Self-diagnostic function check:

Self-diagnostic function check
?1.
Turn the vehicle to the ON mode.

?2.
Do the Self-Diagnostic Function, and use the speaker check mode.

Do all speakers make a sound?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Problem verification:

Problem verification
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
On the customer's vehicle, connect the customer's USB device to the USB port located in the center console.

?3.
Turn the vehicle to the ON mode.

?4.
Turn on the audio unit, and press the AUX button to select the USB mode.

?5.
Check if the USB device can be operated with the audio 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: You can select USB device but sound is low or cannot be heard
     
     
     
The failure is duplicated, go to step 3.
     
NO: USB device does not work
     
     
     
3.
Determine possible failure area (USB device, others):

Determine possible failure area (USB device, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
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.

Does the USB device work properly in the known-good vehicle?

     
YES: With HandsFreeLink
     
     
     
Go to step 4.
     
YES: Without HandsFreeLink
     
     
     
Go to step 5.
     
NO
     
     
     
USB device is faulty or not compatible.?
4.
Determine possible failure area (related unit, others):

Determine possible failure area (related unit, others)
?1.
Return to the customer's vehicle.

?2.
Disconnect the following connector.
HandsFreeLink control unit 32P connector

?3.
Turn the vehicle to the ON mode.

?4.
Check if the USB audio can be played.

Is the USB audio sound normal?

     
YES
     
     
     
     
NO
     
     
     
Go to step 5.
5.
Shorted wire check (GA AUDIO lines) 1:

Shorted wire check (GA AUDIO lines) 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio unit connector C (14P)
Multi-information display unit connector A (32P)

?3.
Check for continuity between these test points and body ground individually.
Test condition
Vehicle OFF (LOCK) mode
 
HandsFreeLink control unit 32P connector: disconnected
 
Audio unit connector C (14P): disconnected
 
Multi-information display unit connector A (32P): disconnected

Connector
Terminal
Audio unit connector C (14P)
No. 1
No. 2
No. 7
No. 8

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire(s) between the audio unit and the multi-information display unit. Replace the affected shielded harness.?
     
NO
     
     
     
The GA AUDIO wires are not shorted to ground. Go to step 6.
6.
Shorted wire check (GA AUDIO lines) 2:

Shorted wire check (GA AUDIO lines) 2
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HandsFreeLink control unit 32P connector: disconnected
 
Audio unit connector C (14P): disconnected
 
Multi-information display unit connector A (32P): disconnected

Test point 1
Audio unit connector C (14P)
Test points 2
Audio unit connector C (14P)
No. 1
No. 2, No. 3, No. 7, No. 8
No. 2
No. 3, No. 7, No. 8
No. 3
No. 7, No. 8
No. 7
No. 8

Is there continuity between any of the terminals?

     
YES
     
     
     
There is a short in the wires between the audio unit and the multi-information display unit. Replace the affected shielded harness.?
     
NO
     
     
     
The GA AUDIO wires are not shorted in the wires. Go to step 7.
7.
Open wire check (GA AUDIO lines):

Open wire check (GA AUDIO lines)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
HandsFreeLink control unit 32P connector: disconnected
 
Audio unit connector C (14P): disconnected
 
Multi-information display unit connector A (32P): disconnected

Test point 1:
Audio unit connector C (14P)
Test point 2:
Multi-information display unit connector A (32P)
No. 1
No. 9
No. 2
No. 8
No. 7
No. 25
No. 8
No. 24

Is there continuity?

     
YES
     
     
     
The GA AUDIO wires are OK. Go to step 8.
     
NO
     
     
     
There is an open in the wire(s) between the audio unit and the multi-information display unit. Replace the affected shielded harness.?
8.
Multi-information display unit check (substitution):

Multi-information display unit check (substitution)
?1.
Substitute a known-good multi-information display unit.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
     
NO