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

E270419E01

PROCEDURE

  1. CHECK NAVIGATION ECU SUB-ASSEMBLY

    1. E238726C01

      *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 hereClick 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. E244514E03

      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 hereClick 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 hereClick here

      Body Electrical > Navigation System > Clear DTCs

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

      Click hereClick 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 hereClick here

      Body Electrical > Navigation System > Clear DTCs

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

      Click hereClick 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 hereClick here