AUDIO AND VISUAL SYSTEM(except 8 Speakers), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio 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 Microphone signal is lost

  • Radio receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • DCM (telematics transceiver)*

  • Harness or connector

WIRING DIAGRAM


  1. w/o Telematics Transceiver

    A01XOWJE03
    *a Shielded
    *b Telephone Microphone Assembly
    *c Map Light Assembly
    *d Radio Receiver Assembly

  2. w/ Telematics Transceiver

    A01XORVE01

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.

Click here

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

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

    B

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

    A

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


    1. Disconnect the I38 radio receiver assembly connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I38-29 (MACC) - T7-4 (MACC) Always Below 1 Ω
      I38-27 (MIN+) - T7-3 (MCO+) Always Below 1 Ω
      I38-48 (MIN-) - T7-2 (MCO-) Always Below 1 Ω
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      I38-49 (SNS2) or T7-1 (SNS2) - Body ground Always 10 kΩ or higher
      I38-29 (MACC) or T7-4 (MACC) - Body ground Always 10 kΩ or higher
      I38-27 (MIN+) or T7-3 (MCO+) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) or T7-2 (MCO-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK RADIO RECEIVER ASSEMBLY


    1. A01XNKNC71
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-28 (SGND) - Body ground Always Below 1 Ω
      I38-48 (MIN-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I38-29 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. B00586FE35

      Remove the map light assembly (telephone microphone assembly).

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SNS2) - 2 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. CHECK MAP LIGHT ASSEMBLY


    1. A01XP6YC01
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the radio receiver assembly connector.

    2. Reconnect the map light assembly connector.

    3. Turn the engine switch on (ACC).

    4. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) of the map light assembly connector.

    5. Check the waveform of the telephone microphone assembly using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly is not output. A
      A waveform synchronized with the voice input to the map light assembly is output. B

    B

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    A

  6. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.

      Click here


      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 MAP LIGHT ASSEMBLY Click here

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


    1. Disconnect the I38 radio receiver assembly connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I38-49 (SNS2) or T7-1 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])


    1. Disconnect the I38 radio receiver assembly connector.

    2. Disconnect the I40 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-27 (MIN+) - I40-18 (MCO+) Always Below 1 Ω
      I38-48 (MIN-) - I40-19 (MCO-) Always Below 1 Ω
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      I38-27 (MIN+) or I40-18 (MCO+) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) or I40-19 (MCO-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY)


    1. Disconnect the I40 DCM (telematics transceiver) connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-33 (MCVD) - T7-4 (MACC) Always Below 1 Ω
      I40-34 (MCI+) - T7-3 (MCO+) Always Below 1 Ω
      I40-35 (MCI-) - T7-2 (MCO-) Always Below 1 Ω
      I40-32 (SGND) - Body ground Always 10 kΩ or higher
      I40-33 (MCVD) or T7-4 (MACC) - Body ground Always 10 kΩ or higher
      I40-34 (MCI+) or T7-3 (MCO+) - Body ground Always 10 kΩ or higher
      I40-35 (MCI-) or T7-2 (MCO-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK RADIO RECEIVER ASSEMBLY


    1. A01XNKNC72
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-28 (SGND) - Body ground Always Below 1 Ω
      I38-48 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  11. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. B0057H2C08
      *a

      Component with harness connected

      (DCM [Telematics Transceiver])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-32 (SGND) - Body ground Always Below 1 Ω
      I40-35 (MCI-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I40-33 (MCVD) - Body ground Engine switch on (ACC) 4 to 6 V
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 4 Click here

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here