1. Check for continuity between hands free telephone control unit 22P connector terminal No. 9 and roof console 10P (LHD) or 12P (RHD) connector terminal No. 1 (LHD) or No. 2 (RHD).

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 | - | Repair open in the wire between the hands free telephone control unit and the roof console.■