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Audio System Symptom Troubleshooting - USB audio device does not work

USB audio device does not work
NOTE:
  • Check the vehicle battery condition first.
  • Check the connectors for poor connections or loose terminals.
  • Check the USB device requirement:
  • -
    Mass-storage class ready digital audio player with USB 2.0 port
    -
    More than 256 MB of RAM
    -
    Supports MP3, WMA, and AAC (encorded with the i-Tunes) files, DRM files are not supported
  1. Turn the ignition switch to ON (II) and turn on the audio unit.
  1. Push the AUX button to select USB mode.
Is USB NO DATA displayed?
YES -
Go to Step 3 .
NO -
Go to Step 8 .
  1. Turn the ignition switch to LOCK (0).
  1. 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?
YES -
Go to Step 5 .
NO -
USB device is faulty. Also check the USB cable and USB adapter connector condition.■
  1. On the customer′s vehicle, remove the USB adapter.
  1. Disconnect USB adapter unit connector B (5P).
  1. Check for continuity between the terminals of USB adapter unit connector B (5P) and USB adapter 5P connector according to the table.
    USB adapterunit connector
    USB adapterconnector
    B1
    1
    B2
    2
    B3
    3
    B4
    4

Is there continuity?
YES -
Substitute a known-good USB adapter cable and recheck. If the symptom/indication goes away, replace the original USB adapter cable. If the symptom/indication still present, go to Step 9 .
NO -
Open in the wire(s) between the USB adapter unit and the USB adapter. Replace the affected shielded harness.■
  1. Turn the ignition switch to LOCK (0).
  1. Remove the audio unit. Check that the audio unit connectors and the USB adapter unit connectors properly connected.
Is the connectors properly connected?
YES -
Go to Step 10 .
NO -
Connect the connectors and recheck.■
  1. Disconnect USB adapter unit connector A (14P).
  1. Turn the ignition switch to ON (II).

  1. Measure the voltage between body ground and USB adapter unit connector A (14P) No. 1 and No. 2 terminals individually.
Is there battery voltage?
YES -
Go to Step 14 .
NO -
Go to Step 13 .

  1. Measure the voltage between body ground and audio unit connector C (14P) No.1 and No.2 terminals individually.
Is there battery voltage?
YES -
Repair open or short in the wire(s) between the audio unit and the USB adapter unit.■
NO -
Replace the audio unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect audio unit connector C (14P).

  1. Check for continuity between audio unit connector C (14P) No. 11 terminal and USB adapter unit connector A (14P) No. 11 terminal.
Is there continuity?
YES -
Go to Step 17 .
NO -
Repair open in the wire between the audio unit and the USB adapter unit.■

  1. Check for continuity between the terminals of audio unit connector C (14P) according to the table.
    From terminal(wire color)
    To terminals(wire color)
    C3 (GRY)
    C9 (YEL), C10 (GRN)
    C9 (YEL)
    C10 (GRN)

Is there continuity between any of the terminals?
YES -
Short in the wires between the audio unit and the USB adapter unit. Replace the affected shielded harness.■
NO -
Go to Step 18 .

  1. Check for continuity between the terminals of audio unit connector C (14P) and USB adapter unit connector A (14P) according to the table.
    Audio unit connector
    USB adapter unit connector
    Wire color
    C9
    A9
    YEL
    C10
    A10
    GRN

Is there continuity?
YES -
Substitute a known-good USB adapter unit, 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.
NO -
Open in the wire(s) between the audio unit and the USB adapter unit. Replace the affected shielded harness.■