NAVIGATION SYSTEM(for SD), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The navigation 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B1579

Voice Recognition Microphone Disconnected

Telephone microphone signal is lost.

  • Navigation receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

WIRING DIAGRAM

E280091E06

CAUTION / NOTICE / HINT

Note:

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

Click hereClick hereClick here

PROCEDURE

  1. CHECK NAVIGATION RECEIVER ASSEMBLY

    1. E280108C06

      *a

      Component with harness connected

      (Navigation Receiver Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G139-18 (SGND) - Body ground

      Always

      Below 1 Ω

      G139-19 (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

      G139-4 (MACC) - Body ground

      Engine switch on (ACC)

      4 to 6 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE NAVIGATION RECEIVER ASSEMBLY

    Click here

    OK

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

    1. Disconnect the G139 navigation receiver assembly connector.

    2. Disconnect the Q7 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G139-4 (MACC) - Q7-11 (MACC)

      Always

      Below 1 Ω

      G139-5 (MIN+) - Q7-10 (MCO+)

      Always

      Below 1 Ω

      G139-19 (MIN-) - Q7-9 (MCO-)

      Always

      Below 1 Ω

      G139-6 (SNS2) - Q7-12 (SNS2)

      Always

      Below 1 Ω

      G139-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      G139-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      G139-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      G139-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      G139-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY

    Click here