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

A01QRYYE06
*a Telephone Microphone Assembly
*b Shielded
*c Map Light Assembly
*d Navigation Receiver Assembly

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK NAVIGATION RECEIVER ASSEMBLY


    1. A01QTMEC06
      *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