DTC Troubleshooting: B1776 - With NAV.
  1. Check for continuity between the terminals shown of the Hands Free Telephone control unit 28P connector and the HFT/navigation microphone 7P connector.
Is there continuity?
YES -
Go to Step 10 .
NO -
Replace the faulty harness between the Hands Free Telephone control unit and the HFT/navigation microphone.■
  1. Disconnect navigation unit connector C (16P).