HFT System Symptom Troubleshooting - The HFT messages cannot be heard or are weak
  1. Check for continuity between body ground and Hands Free Telephone control unit 28P connector terminal No. 3.
Is there continuity?
YES -
Repair short to body ground in the wire between Hands Free Telephone control unit and audio unit.■
NO -
Substitute a known-good Hands Free Telephone control unit and recheck. If symptom goes away, replace the original Hands Free Telephone control unit. If the symptom does not go away, replace the audio unit with navigation system, without navigation system. ■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the Hands Free Telephone control unit 28P connector and HFT switch 7P connector.