NAVIGATION SYSTEM, Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The navigation ECU sub-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.

  • Map light assembly (telephone microphone assembly)

  • Navigation ECU sub-assembly

  • Harness or connector

WIRING DIAGRAM

A005CSCE37
*a Map Light Assembly (Telephone Microphone Assembly)
*b Navigation ECU Sub-assembly

PROCEDURE


  1. INSPECT NAVIGATION ECU SUB-ASSEMBLY


    1. A005AE9E02
      Text in Illustration
      *a

      Component with harness connected

      (Navigation ECU Sub-assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L38-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))


    1. Disconnect the L38 navigation ECU sub-assembly connector.

    2. Disconnect the U3 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L38-6 (SNS2) - U3-5 (SNS2) Always Below 1 Ω
      L38-19 (MIN-) - U3-4 (MCO-) Always Below 1 Ω
      L38-6 (SNS2) - Body ground Always 10 kΩ or higher
      L38-19 (MIN-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. A005AZ9E02
      Text in Illustration
      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U3-5 (SNS2) - U3-4 (MCO-) Always Below 1 Ω

    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    NG

  4. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs and check if the same DTC is output again.

      OK
      No DTCs are output.

    OK

    END

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here