HFT System Symptom Troubleshooting - The HFT messages cannot be heard or are weak
  1. Check for continuity between the terminals of audio unit connector B (20P) according to the table.
    From terminal
    To terminal
    B19
    B9, B10
    B9
    B10

Is there continuity?
YES -
Short in the wire(s) between Hands Free Telephone control unit and audio unit. Replace the appropriate harness.■
NO -
Substitute a known-good Hands Free Telephone control unit and recheck. If the 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. Press the HFT talk button.
Does the audio-HVAC subdisplay (audio/navigation switch panel display or center display unit) the HFT menu and the subdisplay show HandsFreeLink when pressing the HFT talk button?
YES -
Go to Step 10 .
NO -
Go to Step 14 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the Hands Free Telephone control unit 28P connector and audio unit connector B (20P).