NAVIGATION SYSTEM, 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 Code

DTC Detection Condition

Trouble Area

B1579

Telephone microphone signal is lost.

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

WIRING DIAGRAM

E291289E05

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 AND DISPLAY RECEIVER ASSEMBLY

    1. U124074E02

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-18 (SGND) - Body ground

      Always

      Below 1 Ω

      H105-19 (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

      H105-4 (MACC) - Body ground

      Ignition switch ACC

      4 to 6 V
      Table 1. Text in Illustration

      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

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

    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H105-4 (MACC) - Q10-15 (MACC)

      Always

      Below 1 Ω

      H105-5 (MIN+) - Q10-14 (MIC+)

      Always

      Below 1 Ω

      H105-19 (MIN-) - Q10-13 (MIC-)

      Always

      Below 1 Ω

      H105-6 (SNS2) - Q10-4 (SNS2)

      Always

      Below 1 Ω

      H105-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      H105-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      H105-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      H105-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      H105-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a known good one (Click here).

    2. Check for DTCs (Click here).

      OK

      No DTCs are output.

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    REPLACE MAP LIGHT ASSEMBLY

    (Click here)