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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Audio, Visual, Navigation System (Navigation)) >> DTC/Circuit Diagnosis >> Microphone Signal Circuit >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK MICROPHONE SIGNAL CIRCUIT CONTINUITY 
    1. Turn ignition switch OFF.
    2. Disconnect AV control unit connector M97 and microphone connector R8.
    3. Check continuity between AV control unit connector M97 and microphone connector R8.
      AV control unit Microphone Continuity
      Connector Terminal Connector Terminal
      M97 41 R8 2 Yes
      42 4
      43 1
    4. Check continuity between AV control unit connector M97 and ground.
      AV control unit Ground Continuity
      Connector Terminal
      M97 41 - No
      42
      43

      Is inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace harness or connectors.

  2. CHECK MICROPHONE VCC VOLTAGE 
    1. Connect AV control unit connector M97.
    2. Turn ignition switch ON.
    3. Check voltage between terminals of AV control unit connector M97.
      AV control unit connector M97 Voltage (Approx.)
      (+) (-)
      Terminal Terminal
      42 41 5.0 V

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".

  3. CHECK MICROPHONE SIGNAL 
    1. Connect microphone connector.
    2. Check signal between terminals of AV control unit connector M97.
      AV control unit connector M97 Condition Reference value
      (+) (-)
      Terminal Terminal
      43 41 Speak into microphone.
      G04879120

      Is the inspection result normal? 

      YES: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Replace microphone. Refer to "REMOVAL AND INSTALLATION ".