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AUDIO AND VISUAL SYSTEM(for Radio and Display Type), Diagnostic DTC:B1579

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DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected
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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

  • Roof console box assembly

  • Telephone microphone assembly

  • Harness or connector
Table 1. *a Telephone Microphone Assembly *b Shielded *c Map Light Assembly *d Radio and Display Receiver Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

When replacing the radio and display receiver assembly, it is necessary to perform the vehicle contract setting for Connected Services (w/ Connected Services Function).

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PROCEDURE


  1. Click here

    CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. B001YIBE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F124-18 (SGND) - Body ground Always Below 1 Ω
      F124-19 (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
      F124-4 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V
      Table 2. Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

  2. Click here

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


    1. Disconnect the F124 radio and display receiver assembly connector.

    2. Disconnect the R7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F124-4 (MACC) - R7-25 (ACC) Always Below 1 Ω
      F124-5 (MIN+) - R7-27 (MI1+) Always Below 1 Ω
      F124-19 (MIN-) - R7-26 (MIC-) Always Below 1 Ω
      F124-6 (SNS2) - R7-20 (SNS2) Always Below 1 Ω
      F124-4 (MACC) - Body ground Always 10 kΩ or higher
      F124-5 (MIN+) - Body ground Always 10 kΩ or higher
      F124-19 (MIN-) - Body ground Always 10 kΩ or higher
      F124-18 (SGND) - Body ground Always 10 kΩ or higher
      F124-6 (SNS2) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK TELEPHONE MICROPHONE ASSEMBLY


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

    2. Clear the DTCs (Click here).

    3. Check for DTCs (Click here).

      OK
      No DTCs are output.

    • OK

      END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    • NG

      REPLACE MAP LIGHT ASSEMBLY (Click here)