AUDIO AND VISUAL SYSTEM(w/ Multi-display), 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

  • Harness or connector

WIRING DIAGRAM

A01XBIFE08

PROCEDURE


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


    1. Disconnect the F77 multi-media module receiver assembly connector.

    2. Disconnect the R7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-49 (SNS2) - R7-20 (SNS2) Always Below 1 Ω
      F77-29 (MACC) - R7-25 (ACC) Always Below 1 Ω
      F77-27 (MIN+) - R7-27 (MI1+) Always Below 1 Ω
      F77-48 (MIN-) - R7-26 (MIC-) Always Below 1 Ω
      F77-49 (SNS2) or R7-20 (SNS2) - Body ground Always 10 kΩ or higher
      F77-29 (MACC) or R7-25 (ACC) - Body ground Always 10 kΩ or higher
      F77-27 (MIN+) or R7-27 (MI1+) - Body ground Always 10 kΩ or higher
      F77-48 (MIN-) or R7-26 (MIC-) - Body ground Always 10 kΩ or higher
      F77-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01XA71E01
      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
      F77-28 (SGND) - Body ground Always Below 1 Ω
      F77-48 (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
      F77-29 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. B001WKJE13

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

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. A01X4PDE01
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the multi-media module receiver assembly connector.

    2. Reconnect the map light assembly connector.

    3. Turn the engine switch on (ACC).

    4. Connect an oscilloscope to terminals R7-27 (MI1+) and R7-26 (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

  5. REPLACE TELEPHONE MICROPHONE ASSEMBLY


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


    NEXT

  6. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  7. 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