DTC Troubleshooting: B1779
DTC B1779:
 HFT Switch or Voice Control Switch (HFT TALK/HFL BACK Buttons) Circuit Open/Short to Power
  1. Connect the HDS to the DLC.
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
  1. Check for DTCs with the HDS.
Is DTC B1779 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Turn the ignition switch to LOCK (0).
  1. Do the HFT switch test.
Is the switch OK?
YES -
Go to Step 7 .
NO -
Replace the HFT switch. ■
  1. Remove the passenger's dashboard undercover.
  1. Disconnect Hands Free Telephone control unit 28P connector.
  1. Disconnect HFT switch 7P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage of the HFL switch connector (7P) terminal No. 4 to body ground.
Is there voltage?
YES -
Repair a short to power on BLU wire.■
NO -
Go to Step 12 .