AUDIO AND VISUAL SYSTEM, Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The multi-media module 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 Code DTC Detection Condition Trouble Area
B1579 Telephone microphone signal is lost.

  • Multi-media module receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • DCM (telematics transceiver)*

  • Harness or connector

WIRING DIAGRAM

A01FSNFE09

INSPECTION PROCEDURE

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/o Emergency Call Switch A
      w/ Emergency Call Switch B

    B

    CHECK HARNESS OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the N164 multi-media module receiver assembly connector.

    2. Disconnect the Y11 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-49 (SNS2) - Y11-1 (SNS2) Always Below 1 Ω
      N164-29 (MACC) - Y11-4 (MACC) Always Below 1 Ω
      N164-27 (MIN+) - Y11-3 (MCO+) Always Below 1 Ω
      N164-48 (MIN-) - Y11-2 (MCO-) Always Below 1 Ω
      N164-49 (SNS2) - Body ground Always 10 kΩ or higher
      N164-29 (MACC) - Body ground Always 10 kΩ or higher
      N164-27 (MIN+) - Body ground Always 10 kΩ or higher
      N164-48 (MIN-) - Body ground Always 10 kΩ or higher
      N164-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. Reconnect the multi-media module receiver assembly connector.

    2. A01FS18E68
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-28 (SGND) - Body ground Always Below 1 Ω
      N164-48 (MIN-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N164-29 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. A01FT5FE04

      Remove the map light assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (MCO-) - 1 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  5. CHECK MAP LIGHT ASSEMBLY


    1. Reconnect the multi-media module receiver assembly connector.

    2. A01FR77E02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the map light assembly connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals Y11-3 (MCO+) and Y11-2 (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 MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    A

  6. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same DTC is output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

  7. CHECK HARNESS OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the N164 multi-media module receiver assembly connector.

    2. Disconnect the Y11 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-49 (SNS2) - Y11-1 (SNS2) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])


    1. Disconnect the N164 multi-media module receiver assembly connector.

    2. Disconnect the N86 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-27 (MIN+) - N86-7 (MCO+) Always Below 1 Ω
      N164-48 (MIN-) - N86-8 (MCO-) Always Below 1 Ω
      N164-27 (MIN+) - Body ground Always 10 kΩ or higher
      N164-48 (MIN-) - Body ground Always 10 kΩ or higher
      N164-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the N86 DCM (telematics transceiver) connector.

    2. Disconnect the Y11 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N86-20 (MCVD) - Y11-4 (MACC) Always Below 1 Ω
      N86-6 (MCI+) - Y11-3 (MCO+) Always Below 1 Ω
      N86-5 (MCI-) - Y11-2 (MCO-) Always Below 1 Ω
      N86-20 (MCVD) - Body ground Always 10 kΩ or higher
      N86-6 (MCI+) - Body ground Always 10 kΩ or higher
      N86-5 (MCI-) - Body ground Always 10 kΩ or higher
      N86-21 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01FS18E69
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

      Reconnect the multi-media module receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-28 (SGND) - Body ground Always Below 1 Ω
      N164-48 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  11. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. A01FRZ1E18
      Text in Illustration
      *a

      Component with harness connected

      (DCM [Telematics Transceiver])

      Reconnect the DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N86-21 (SGND) - Body ground Always Below 1 Ω
      N86-5 (MCI-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N86-20 (MCVD) - Body ground Power switch on (ACC) 4 to 6 V

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

  12. INSPECT MAP LIGHT ASSEMBLY


    1. A01FT5FE04

      Remove the map light assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (MCO-) - 1 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  13. CHECK MAP LIGHT ASSEMBLY


    1. Reconnect the multi-media module receiver assembly connector.

    2. Reconnect the DCM (telematics transceiver) connector.

    3. A01FR77E02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the map light assembly connector.

    4. Turn the power switch on (ACC).

    5. Connect an oscilloscope to terminals Y11-3 (MCO+) and Y11-2 (MCO-) of the map light assembly connector.

    6. 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 MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    A

  14. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same DTC is output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)