USB input sound is low or cannot be heard (without navigation)
- Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
- 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 in USB devices working in newer vehicles, but not in older vehicles of the same model.
- Turn the ignition switch ON (II).
- 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) (see NO SOUND IS HEARD FROM THE SPEAKER(S) (DISPLAY IS NORMAL) (WITHOUT NAVIGATION) ).
- Turn the ignition switch to LOCK (0).
- On the customer's vehicle, connect the customer's USB device to the USB adapter.
- Turn the ignition switch to ON (II).
- Turn on the audio unit.
- Press the AUX button until USB appears on the audio display.
- Check if the USB device can be operated with the audio unit (Folders of Files UP/DOWN, etc.).
Can you operate the USB device, and can you hear the sound?
YES -Go to step 9.
NO -If the sound is normal, the USB device is OK at this time. If you cannot operate the USB device, go to USB device does not function (see USB DEVICE DOES NOT FUNCTION (WITHOUT NAVIGATION) ).
- Turn the ignition switch to LOCK (0).
- 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 11.
NO -USB device is faulty. Also check the USB cable and USB adapter connector condition.
- Return to the customer's vehicle.
- Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and disconnect audio unit connector E (14P).
- Disconnect USB adapter unit connector A (14P).
- Check for continuity between body ground and audio unit connector E (14P) according to the table.AUDIO UNIT CONNECTOR CHART
Audio unit connector Wire color E5 BLK E6 WHT E13 RED E14 GRN Is there any continuity?
YES -There is a short to body ground in the wire(s) between the audio unit and the USB adapter unit. Replace the affected shielded harness.
NO -go to step 15.
- Check for continuity between the terminals of audio unit connector E (14P) according to the table.AUDIO UNIT CONNECTOR CHART
From terminal (wire color) To terminal (wire color) E4 (GRY) E5 (BLK), E6 (WHT), E13 (RED), E14 (GRN) E5 (BLK) E6 (WHT), E13 (RED), E14 (GRN) E6 (WHT) E13 (RED), E14 (GRN) E13 (RED) E14 (GRN) 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 16.
- Check for continuity between audio unit connector E (14P) and USB adapter unit connector A (14P) according to the table.AUDIO UNIT CONNECTOR CHART
Audio unit connector USB adapter unit connector Wire color E5 A5 BLK E6 A6 WHT E13 A13 RED E14 A14 GRN Is there continuity?
YES -Substitute a known-good USB adapter unit (see 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 (see 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.