Check for continuity between Hands Free Telephone control unit 28P connector terminal No. 13 and HFT/navigation microphone 7P connector terminal No. 3.
Is there continuity?
YES
-
Substitute a known-good Hands Free Telephone control unit, then recheck. If the symptom goes away, replace the original Hands Free Telephone control unit.■
NO
-
Replace the faulty harness between the Hands Free Telephone control unit and the HFT/navigation microphone.■