AUDIO AND VISUAL SYSTEM(for 10.3 Inch Display), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio receiver assembly and 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 receiver assembly

  • Telephone microphone assembly

  • Harness or connector

WIRING DIAGRAM

B002HE8E06
*a Telephone Microphone Assembly
*b Radio Receiver Assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the radio receiver assembly, always replace it with a new one.

    If a radio receiver assembly which was installed to another vehicle is used, the following may occur:


    • A communication malfunction DTC may be stored.

    • The radio receiver assembly may not operate normally.

Tech Tips

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.

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PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the I153 radio receiver assembly connector.

    2. Disconnect the T20 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I153-25 (SNS2) - T20-3 (SNS2) Always Below 1 Ω
      I153-22 (MIN-) - T20-4 (MCO-) Always Below 1 Ω
      I153-25 (SNS2) - Body ground Always 10 kΩ or higher
      I153-22 (MIN-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. INSPECT TELEPHONE MICROPHONE ASSEMBLY (SNS2, MCO-)


    1. Remove the telephone microphone assembly.

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    2. B002KAZN01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (SNS2) - 4 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG