USB audio device input sound is low or cannot be heard
NOTE:
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Turn the ignition switch to ON (II).
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Do all speakers make a sound?
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YES
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-
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NO
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-
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Go to no sound is heard from speaker(s).■
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Turn the ignition switch to LOCK (0).
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Connect the customer′ s USB device to a known-good vehicle that equipped with the USB adapter and check the USB device operation.
Is the USB device working properly?
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YES
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-
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NO
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-
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USB device is faulty. Also check the USB cable and USB adapter connector condition.■
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On the customer′s vehicle, connect the customer′s USB device to the USB adapter.
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Turn the ignition switch to ON (II) and turn on the audio unit.
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Check if the USB device can be operated with the audio unit (Folders or Files UP/DOWN, etc.).
Can the USB device be operated but no sound is heard?
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Turn the ignition switch to LOCK (0).
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Disconnect audio unit connector C (14P).
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Disconnect USB adapter unit connector A (14P).
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Check for continuity between the terminals of audio unit connector C (14P) according to the table.
From terminal(wire color)
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To terminals(wire color)
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C4 (PNK)
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C5 (BRN), C6 (WHT), C13 (RED), C14 (LT BLU)
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C5 (BRN)
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C6 (WHT), C13 (RED), C14 (LT BLU)
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C6 (WHT)
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C13 (RED), C14 (LT BLU)
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C13 (RED)
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C14 (LT BLU)
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Is there continuity between any of the terminals?
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YES
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-
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Short in the wires between audio unit and USB adapter unit. Replace the affected shielded harness.■
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NO
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-
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