Diagnosis Procedure

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONTINUITY BETWEEN TEL ADAPTER UNIT AND MICROPHONE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TEL adapter unit connector and microphone connector.
3. Check continuity between TEL adapter unit harness connector terminals 7, 8, 29 and microphone harness connector terminals 1, 2, 4.
  7 - 1: Continuity should exist.
  
  8 - 2: Continuity should exist.
  
  29 - 4: Continuity should exist.
4. Check continuity between TEL adapter unit harness connector terminals 7, 29 and ground.
  7, 29 - Ground: Continuity should not exist.
Is the inspection result normal?

Yes: GO TO 2.

No: Repair harness or connector.
CHECK VOLTAGE MICROPHONE VCC
1. Connect TEL adapter unit connector.
2. Turn ignition switch ON.
3. Check voltage between TEL adapter unit harness connector terminal 29 and 8.
  29 - 8: Approx. 5 V
Is the inspection result normal?

Yes: GO TO 3.

No: Replace TEL adapter unit.

CHECK MICROPHONE SIGNAL

Connect microphone connector.

Check signal between TEL adapter unit harness connector terminals 7 and 8.

SIGNAL REFERENCE TABLE

Terminal	Condition		Reference value
7 - 8	Ignition switch ON	Give a voice.	Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

Yes: Replace TEL adapter unit.

No: Replace microphone.