AUDIO AND VISUAL SYSTEM (for Radio and Display Type), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio and display receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

This DTC is stored when the microphone connection detection signal is disconnected.

DTC Code DTC Detection Condition Trouble Area
B1579 Telephone microphone signal is lost.

  • Telephone microphone assembly

  • Map light assembly

  • Radio and display receiver assembly

  • Harness or connector

WIRING DIAGRAM

A010PIOE03

INSPECTION PROCEDURE

PROCEDURE


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


    1. Disconnect the D124 radio and display receiver assembly connector.

    2. Disconnect the K15 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D124-6 (SNS2) - K15-5 (SNS2) Always Below 1 Ω
      D124-19 (MIN-) - K15-14 (MIC-)
      D124-6 (SNS2) - Body ground Always 10 kΩ or higher
      D124-19 (MIN-) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A010QN3E01
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D124-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. CHECK MAP LIGHT ASSEMBLY


    1. A010N6PE06

      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
      14 (MIC-) - 5 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY


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

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)