NAVIGATION 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 (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.

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

WIRING DIAGRAM

A01QPSGE04

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 RADIO & DISPLAY RECEIVER ASSEMBLY


    1. A01QTMEC11
      *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
      G143-18 (SGND) - Body ground Always Below 1 Ω
      G143-19 (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
      G143-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY Click here

    OK

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


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

    2. Disconnect the Q16 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G143-4 (MACC) - Q16-3 (MACC) Always Below 1 Ω
      G143-5 (MIN+) - Q16-4 (MCO+) Always Below 1 Ω
      G143-19 (MIN-) - Q16-6 (MCO-) Always Below 1 Ω
      G143-6 (SNS2) - Q16-5 (SNS2) Always Below 1 Ω
      G143-4 (MACC) - Body ground Always 10 kΩ or higher
      G143-5 (MIN+) - Body ground Always 10 kΩ or higher
      G143-19 (MIN-) - Body ground Always 10 kΩ or higher
      G143-18 (SGND) - Body ground Always 10 kΩ or higher
      G143-6 (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. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. 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