Audio System Symptom Troubleshooting - USB device does not function
  1. Check for continuity between USB adapter unit connector A (14P) terminal No. 4 and No. 5, No. 6, No. 13, No. 14 according to the table.
    From terminal
    To terminals
    No. 4 (GRY)
    No. 5 (GRN), No. 6 (BLK), No. 13 (WHT), No. 14 (RED)

Is there continuity?
YES -
Repair short in the wire(s) betweens USB adapter connector A (14P). Replace the appropriate shield harness.■
NO -
Repair the USB adapter unit. ■