AUDIO AND VISUAL 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 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

  • Radio and display receiver assembly

  • Harness or connector

WIRING DIAGRAM

E270419E06

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY [TELEPHONE MICROPHONE ASSEMBLY])

    1. Disconnect the G143 radio and display receiver assembly connector.

    2. Disconnect the Q16 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

      G143-6 (SNS2) - Q16-5 (SNS2)

      Always

      Below 1 Ω

      G143-19 (MIN-) - Q16-6 (MCO-)

      Always

      Below 1 Ω

      G143-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

      G143-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. Remove the radio and display receiver assembly with its connector still connected.

      Click here

    2. E237416C02

      *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

      G143-19 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY

    1. Remove the map light assembly.

      Click here

    2. E333810E03

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (SNS2) - 6 (MCO-)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a new or known good 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.

      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

    REPLACE MAP LIGHT ASSEMBLY

    Click here