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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio, Visual & Navigation System (INFINITI INTOUCH) (Diagnostic Trouble Codes (DTCS) & Symptom Tests (Exc Hybrid) >> DTC/Circuit Diagnosis >> Microphone Signal Circuit >> With Telematics System >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONTINUITY BETWEEN DISPLAY CONTROL UNIT AND TCU CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect display control unit harness connector and TCU harness connector.
    3. Check the continuity between display control unit harness connector and TCU harness connector.
      Display control unit TCU Continuity
      Connector Terminals Connector Terminals
      M101 72 M81 21 Existed
      71 22
      87 23
    4. Check the continuity between display control unit harness connector and ground.
      Display control unit Ground Continuity
      Connector Terminals
      M101 72 Not existed
      71

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair or replace malfunctioning parts.

  2. CHECK VOLTAGE TEL ON SIGNAL

    1. Connect display control unit harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between display control unit harness connector and ground.
      Terminals Voltage
      (Approx.)
      (+) (-)
      Display control unit
      Connector Terminal
      M101 72 Ground 5.0 V

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Replace display control unit. Refer to REMOVAL AND INSTALLATION .

  3. CHECK MICROPHONE SIGNAL (display CONTROL UNIT TO TCU)

    1. Turn ignition switch OFF.
    2. Connect TCU harness connector.
    3. Turn ignition switch ON.
    4. Check the signal between display control unit harness connector.
      Display control unit  
      Condition      		 Reference value
      Connector Terminals
      (+) (-)
      Terminal
      M101 71 52 Give a voice.
      G04084885Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES 

    Replace display control unit. Refer to REMOVAL AND INSTALLATION .

    NO 

    GO TO STEP 4  .

  4. CHECK CONTINUITY BETWEEN TCU AND MICROPHONE CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect TCU harness connector and microphone harness connector.
    3. Check the continuity between TCU harness connector and microphone harness connector.
      TCU Microphone Continuity
      Connector Terminals Connector Terminals
      M81 18 R12 4 Existed
      19 1
      20 2
    4. Check the continuity between TCU harness connector and ground.
      TCU Ground Continuity
      Connector Terminals
      M81 18 Not existed
      19

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace malfunctioning parts.

  5. CHECK VOLTAGE MICROPHONE POWER SUPPLY

    1. Connect TCU harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between TCU harness connector ground.
      Terminals Voltage
      (Approx.)
      (+) (-)
      TCU
      Connector Terminal
      M81 18 Ground 5.0 V

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace TCU. Refer to REMOVAL AND INSTALLATION .

  6. CHECK MICROPHONE SIGNAL (TCU TO MICROPHONE)

    1. Turn ignition switch OFF.
    2. Connect microphone harness connector.
    3. Turn ignition switch ON.
    4. Check the signal between TCU harness connector.
      TCU  
      Condition      		 Reference value
      Connector Terminals
      (+) (-)
      Terminal
      M81 19 20 When inputting interior sound.
      G04084885Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES 

    Replace TCU. Refer to REMOVAL AND INSTALLATION .

    NO 

    Replace microphone. Refer to REMOVAL AND INSTALLATION .

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