DTC Troubleshooting: B1779
  1. Check for continuity between HFT control switch the 5P connector terminal No. 4 and body ground.
Is there voltage?
YES -
Go to Step 16 .
NO -
Repair open in the wire between the switch, cable reel, and the audio unit or poor ground (G505).■
  1. Reconnect the Hands Free Telephone control unit 22P connector.
  1. Turn the ignition switch ON (II).