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

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

Microphone signal from the telephone microphone assembly is sent to the radio and display receiver assembly.

Also, power is supplied from the radio and display receiver assembly to the telephone microphone assembly.

If microphone signal is disconnected, this DTC is stored.

This DTC is stored when a malfunction occurs in a connected device.

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

  • Map light assembly (telephone microphone assembly)

  • Radio and display receiver assembly

WIRING DIAGRAM

A01J4JAE15

INSPECTION PROCEDURE

Tech Tips

For vehicles equipped with an Extension Module, refer to optional equipment's manuals.

PROCEDURE


  1. CHECK MICROPHONE (OPERATION CHECK)


    1. Enter the "Microphone & Voice Recognition Check" screen Click here.

    2. A01J7C1

      When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

      OK
      Check result is normal.

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - MAP LIGHT) Click here

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

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


    1. Disconnect the R19 radio and display receiver assembly connector.

    2. Disconnect the M4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R19-4 (MACC) - M4-4 (MACC) Always Below 1 Ω
      R19-5 (MIN+) - M4-3 (MCO+)
      R19-19 (MIN-) - M4-2 (MCO-)
      R19-6 (SNS2) - Body ground
      R19-4 (MACC) - Body ground Always 10 kΩ or higher
      R19-5 (MIN+) - Body ground
      R19-19 (MIN-) - Body ground
      R19-18 (SGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01J5CAE16
      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
      R19-18 (SGND) - Body ground Always Below 1 Ω
      R19-19 (MIN-) - Body ground

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R19-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  4. REPLACE TELEPHONE MICROPHONE WITH ANOTHER AND CHECK


    1. Replace the telephone microphone with a normal 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)