AUDIO AND VISUAL SYSTEM(w/o Navigation 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B1579

Voice Recognition Microphone Disconnected

Microphone signal is lost.

  • Map light assembly

  • Telephone microphone assembly

  • Multi-media module receiver assembly

  • Harness or connector

WIRING DIAGRAM

E287198E01

PROCEDURE

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

    1. Disconnect the H57 multi-media module receiver assembly connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H57-5 (MIN+) - W7-12 (MCO+)

      Always

      Below 1 Ω

      H57-4 (MACC) - W7-11 (MACC)

      Always

      Below 1 Ω

      H57-19 (MIN-) - W7-13 (MCO-)

      Always

      Below 1 Ω

      H57-6 (SNS2) - W7-14 (SNS2)

      Always

      Below 1 Ω

      H57-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      H57-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      H57-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      H57-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      H57-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

    1. E280108C03

      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H57-4 (MACC) - Body ground

      Engine switch on (ACC)

      4 to 6 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H57-18 (SGND) - Body ground

      Always

      Below 1 Ω

      H57-19 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY

    Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY

    1. E140936N08

      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

      13 (MCO-) - 14 (SNS2)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLYClick here

    OK

  4. CHECK MAP LIGHT ASSEMBLY

    1. Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the map light assembly connector.

    3. E205727C04

      *a

      Component with harness connected

      (Map Light Assembly)

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

    4. Proceed to the next step based on the inspection result.

    Result

    Result

    Proceed to

    A waveform synchronized with the voice input to the map light assembly is output.

    A

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

    B
    A

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY

    Click here

    B

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY

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

      Click here

    2. Check if the same DTC is output again.

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY

    Click here