Audio System Symptom Troubleshooting - USB device does not function
  1. Check for continuity between the body ground and USB adapter unit connector A terminals No. 2, No. 9 and No. 10 terminal of the USB adapter connector A (14P) individually.
Is there continuity?
YES -
Repair short in the wire(s) between the USB adapter connector A (14P) and body ground.■
NO -
Go to Step 22 .