NAVIGATION 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 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.

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

WIRING DIAGRAM

A01DSYUE06

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01DOJ9E17
      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
      H51-18 (SGND) - Body ground Always Below 1 Ω
      H51-19 (MIN-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H51-4 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the H51 radio and display 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
      H51-4 (MACC) - W7-11 (MACC) Always Below 1 Ω
      H51-5 (MIN+) - W7-12 (MCO+) Always Below 1 Ω
      H51-19 (MIN-) - W7-13 (MCO-) Always Below 1 Ω
      H51-6 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H51-4 (MACC) - Body ground Always 10 kΩ or higher
      H51-5 (MIN+) - Body ground Always 10 kΩ or higher
      H51-19 (MIN-) - Body ground Always 10 kΩ or higher
      H51-18 (SGND) - Body ground Always 10 kΩ or higher
      H51-6 (SNS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TELEPHONE MICROPHONE ASSEMBLY


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

    2. Check for DTCs Click here.

      OK
      No DTCs are output.

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)