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

A000YFLE32

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 (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 L164 multi-media module receiver assembly connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L164-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω
      L164-29 (MACC) - X4-22 (ACC) Always Below 1 Ω
      L164-27 (MIN+) - X4-21 (MI1+) Always Below 1 Ω
      L164-48 (MIN-) - X4-20 (MIC-) Always Below 1 Ω
      L164-49 (SNS2) or X4-31 (SNS2) - Body ground Always 10 kΩ or higher
      L164-29 (MACC) or X4-22 (ACC) - Body ground Always 10 kΩ or higher
      L164-27 (MIN+) or X4-21 (MI1+) - Body ground Always 10 kΩ or higher
      L164-48 (MIN-) or X4-20 (MIC-) - Body ground Always 10 kΩ or higher
      L164-28 (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. A000ZVME02
      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
      L164-28 (SGND) - Body ground Always Below 1 Ω
      L164-48 (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
      L164-29 (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. A000TGUE08

      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
      20 (MIC-) - 31 (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. A000WNSE02
      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 X4-21 (MI1+) and X4-20 (MIC-) 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 known good one Click here.


    NEXT

  7. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  8. CHECK FOR DTC


    1. Recheck for DTCs and check if the same DTC is output again Click here.

      OK
      No DTCs are output.

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

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


    1. Disconnect the L164 multi-media module receiver assembly connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L164-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the L164 multi-media module receiver assembly connector.

    2. Disconnect the L191 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L164-27 (MIN+) - L191-18 (MCO+) Always Below 1 Ω
      L164-48 (MIN-) - L191-19 (MCO-) Always Below 1 Ω
      L164-27 (MIN+) or L191-18 (MCO+) - Body ground Always 10 kΩ or higher
      L164-48 (MIN-) or L191-19 (MCO-) - Body ground Always 10 kΩ or higher
      L164-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the L191 DCM (telematics transceiver) connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L191-33 (MCVD) - X4-22 (ACC) Always Below 1 Ω
      L191-34 (MCI+) - X4-21 (MI1+) Always Below 1 Ω
      L191-35 (MCI-) - X4-20 (MIC-) Always Below 1 Ω
      L191-33 (MCVD) or X4-22 (ACC) - Body ground Always 10 kΩ or higher
      L191-34 (MCI+) or X4-21 (MI1+) - Body ground Always 10 kΩ or higher
      L191-35 (MCI-) or X4-20 (MIC-) - Body ground Always 10 kΩ or higher
      L191-32 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A000Y7BE02
      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
      L164-28 (SGND) - Body ground Always Below 1 Ω
      L164-48 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  13. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. A000TAYE02
      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
      L191-32 (SGND) - Body ground Always Below 1 Ω
      L191-35 (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
      L191-33 (MCVD) - Body ground Power switch on (ACC) 4 to 6 V

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

  14. INSPECT MAP LIGHT ASSEMBLY


    1. A000TGUE08

      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
      20 (MIC-) - 31 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  15. CHECK MAP LIGHT ASSEMBLY


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

    2. Reconnect the DCM (telematics transceiver) connector.

    3. A000WNSE02
      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 X4-21 (MI1+) and X4-20 (MIC-) 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

  16. CHECK TELEPHONE MICROPHONE ASSEMBLY


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


    NEXT

  17. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  18. CHECK FOR DTC


    1. Recheck for DTCs and check if the same DTC is output again Click here.

      OK
      No DTCs are output.

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here