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AUDIO AND VISUAL SYSTEM(for Radio and Display Type), Diagnostic DTC:B1579

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DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected
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DESCRIPTION

The radio and display receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1579 Voice Recognition Microphone Disconnected Telephone microphone signal is lost

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

  • Telematics transceiver*

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.

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PROCEDURE


  1. Click here

    CONFIRM MODEL


    1. Choose the model to be inspected.

      Model
      Model Proceed to
      w/o Telematics Transceiver A
      w/ Telematics Transceiver B

  2. Click here

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the G37 radio and display receiver assembly connector.

    2. Disconnect the Q3 map light assembly (telephone microphone assembly) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-4 (MACC) - Q3-15 (MACC) Always Below 1 Ω
      G37-5 (MIN+) - Q3-14 (MCO+) Always Below 1 Ω
      G37-19 (MIN-) - Q3-13 (MCO-) Always Below 1 Ω
      G37-18 (SGND) - Body ground Always 10 kΩ or higher
      G37-4 (MACC) or Q3-15 (MACC) - Body ground Always 10 kΩ or higher
      G37-5 (MIN+) or Q3-14 (MCO+) - Body ground Always 10 kΩ or higher
      G37-19 (MIN-) or Q3-13 (MCO-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

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    2. Inspect the map light assembly.

      Click here

      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      1. Body Electrical > Navigation System > Clear DTCs


    3. Recheck for DTCs and check if the same DTC is output again.

      Click here


      1. Body Electrical > Navigation System > Trouble Codes


      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    • OK

      END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    • NG

      REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLYClick here

  5. Click here

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEMATICS TRANSCEIVER)


    1. Disconnect the G37 radio and display receiver assembly connector.

    2. Disconnect the G130 telematics transceiver connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-5 (MIN+) - G130-18 (MCO+) Always Below 1 Ω
      G37-19 (MIN-) - G130-19 (MCO-) Always Below 1 Ω
      G37-5 (MIN+) or G130-18 (MCO+) - Body ground Always 10 kΩ or higher
      G37-19 (MIN-) or G130-19 (MCO-) - Body ground Always 10 kΩ or higher
      G37-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY)


    1. Disconnect the G130 telematics transceiver connector.

    2. Disconnect the Q3 map light assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G130-33 (MCVD) - Q3-15 (MACC) Always Below 1 Ω
      G130-34 (MCI+) - Q3-14 (MCO+) Always Below 1 Ω
      G130-35 (MCI-) - Q3-13 (MCO-) Always Below 1 Ω
      G130-33 (MCVD) or Q3-15 (MACC) - Body ground Always 10 kΩ or higher
      G130-34 (MCI+) or Q3-14 (MCO+) - Body ground Always 10 kΩ or higher
      G130-35 (MCI-) or Q3-13 (MCO-) - Body ground Always 10 kΩ or higher
      G130-32 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. Inspect the map light assembly.

      Click here

      Result
      Proceed to
      OK
      NG

  8. Click here

    CHECK TELEMATICS TRANSCEIVER


    1. B0027EWC24
      *a

      Component with harness connected

      (Telematics Transceiver)

      Disconnect the Q3 map light assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G130-33 (MCVD) - Body ground Ignition switch ACC 4 to 6 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G130-32 (SGND) - Body ground Always Below 1 Ω
      G130-35 (MCI-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      1. Body Electrical > Navigation System > Clear DTCs


    3. Recheck for DTCs and check if the same DTC is output again.

      Click here


      1. Body Electrical > Navigation System > Trouble Codes


      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    • OK

      END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    • NG

      REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLYClick here