Audio System Symptom Troubleshooting - USB device does not function
  1. Check for continuity between USB adapter unit connector A (14P), and the audio unit connector D (14P) according to the table.
    USB adapter unit connector
    Audio unit connector
    +B
    A1 (WHT)
    D1 (WHT)
    GND
    A11 (BLK)
    D11 (BLK)

Is there continuity?
YES -
Go to Step 27 .
NO -
Repair open in the wire(s) between the USB adapter unit connector A (14P) terminal No. 1, No. 11 and audio unit connector D (14P) terminal No. 1, No. 11.■