NAVIGATION SYSTEM(for HDD), 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 No. Detection Item DTC Detection Condition Trouble Area
B1579 Voice Recognition Microphone Disconnected Telephone microphone signal is lost.

  • Map light assembly (telephone microphone assembly)

  • Navigation ECU sub-assembly

  • Harness or connector

WIRING DIAGRAM

A01QP9CE01
*1 Telephone Microphone Assembly
*2 Map Light Assembly
*3 Navigation ECU Sub-assembly

PROCEDURE


  1. CHECK NAVIGATION ECU SUB-ASSEMBLY


    1. A01QQ2QC01
      *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
      G139-19 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    OK

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


    1. Disconnect the G139 navigation ECU sub-assembly connector.

    2. Disconnect the Q7 map light assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G139-6 (SNS2) - Q7-12 (SNS2) Always Below 1 Ω
      G139-19 (MIN-) - Q7-9 (MCO-) Always Below 1 Ω
      G139-6 (SNS2) - Body ground Always 10 kΩ or higher
      G139-19 (MIN-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Remove the map light assembly (telephone microphone assembly).

      Click here

    2. A01QP53E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      12 (SNS2) - 9 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    NG

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY


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

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

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

      Click here


      Body Electrical > Navigation System > Trouble Codes
      Result
      Proceed to
      No DTCs are output
      DTCs are output

    No DTCs are output

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    DTCs are output

  5. CHECK MAP LIGHT ASSEMBLY


    1. Replace the map light assembly with a new or normally functioning one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

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

      Click here


      Body Electrical > Navigation System > Trouble Codes
      Result
      Proceed to
      No DTCs are output
      DTCs are output

    No DTCs are output

    END (MAP LIGHT ASSEMBLY IS DEFECTIVE)

    DTCs are output

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here