DTC Troubleshooting: B1780

DTC B1780: HFT-Voice Control Switch (HFT TALK/HFT BACK Buttons) Circuit Short NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A. Clear the DTCs with the HDS. Turn the ignition switch OFF, then start the vehicle and turn the steering wheel back and forth several times. Check for DTCs with the HDS. Is DTC B1780 indicated?
YES | - | Go to Step 4 .
NO | - | Intermittent failure, the system is OK at this time.■
Turn the ignition switch OFF. Do the HFT-voice control switch test. Is the switch OK?
YES | - | Go to Step 6 .
NO | - | Replace the HFT-voice control switch. ■
Remove the upper panel. Disconnect the 22P connector from the hands free telephone control unit. Disconnect the 5P connector from the HFT-voice control switch. Turn the ignition switch OFF. Check for continuity between the hands free telephone control unit 22P connector terminal No. 2 and HFT-voice control switch 5P connector terminal No. 3. Is there continuity?
YES | - | Repair short in the wire.■
NO | - | Replace the hands free telephone control unit .■