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Home >> Infiniti >> 2017 >> QX70 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 225 (Audio, Visual & Navigation System (INFINITI INTOUCH) (Diagnostic Trouble Codes (DTCS) B1F10-U1725 And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> Microphone Signal Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

  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 Terminal Connector Terminal
      M101 71 M159 12 Existed
      52 11
    4. Check the continuity between display control unit harness connector and ground.
      Display control unit Ground Continuity
      Connector Terminal
      M101 71 Not existed

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair or replace malfunctioning parts.

  2. CHECK MICROPHONE SIGNAL (DISPLAY CONTROL UNIT TO TCU)

    1. Connect TCU harness connector.
    2. Turn ignition switch ON.
    3. Check the signal between display control unit harness connector.
      Display control unit  
      Condition      		 Reference value
      Connector (+) (-)
      Terminal
      M101 71 52 Give a voice.
      G04124472Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES 

    Replace display control unit. Refer to REMOVAL AND INSTALLATION .

    NO 

    GO TO STEP 3  .

  3. 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 Terminal Connector Terminal
      M159 16 R12 2 Existed
      17 1
      18 4
    4. Check the continuity between TCU harness connector and ground.
      TCU Ground Continuity
      Connector Terminal
      M159 17 Not existed
      18

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace malfunctioning parts.

  4. CHECK VOLTAGE MICROPHONE POWER SUPPLY

    1. Connect TCU harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between TCU harness connector ground.
      (+) (-) Voltage
      (Approx.)
      TCU
      Connector Terminal
      M159 18 Ground 5.0 V

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace TCU. Refer to REMOVAL AND INSTALLATION .

  5. 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 (+) (-)
      Terminal
      M159 17 16 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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