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

E270419E08

PROCEDURE

  1. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. U124002E02

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-19 (MIN-) - Body ground

      Always

      Below 1 Ω
      Table 1. Text in Illustration

      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

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

    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-6 (SNS2) - Q10-4 (SNS2)

      Always

      Below 1 Ω

      H105-19 (MIN-) - Q10-13 (MIC-)

      H105-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

      H105-19 (MIN-) - Body ground

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT MAP LIGHT ASSEMBLY

    1. E267338E05

      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 (MIC-) - 4 (SNS2)

      Always

      Below 1 Ω

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone with a normal one (Click here).

    2. Clear the DTCs (Click here).

    3. Check for DTCs (Click here).

      OK

      No DTCs are output.

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    REPLACE MAP LIGHT ASSEMBLY

    (Click here)