AUDIO AND VISUAL SYSTEM(for 7 Inch Display) Microphone Circuit

DESCRIPTION

The radio receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.

WIRING DIAGRAM

B004EXGE09
*a (Shielded)
*b Telephone Microphone Assembly
*c Radio Receiver Assembly

CAUTION / NOTICE / HINT

Note


  • 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.

    Click here

  • 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.

PROCEDURE


  1. CHECK MICROPHONE (OPERATION CHECK)


    1. B004EX4

      Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio receiver assembly) in Operation Check.

      Click here

    2. When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

      OK
      Check result is normal.
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

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


    1. Disconnect the O147 radio receiver assembly connector.

    2. Disconnect the W14 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O147-25 (SNS2) - W14-3 (SNS2) Always Below 1 Ω
      O147-23 (MACC) - W14-1 (MACC) Always Below 1 Ω
      O147-21 (MIN+) - W14-2 (MCO+) Always Below 1 Ω
      O147-22 (MIN-) - W14-4 (MCO-) Always Below 1 Ω
      O147-25 (SNS2) or W14-3 (SNS2) - Body ground Always 10 kΩ or higher
      O147-23 (MACC) or W14-1 (MACC) - Body ground Always 10 kΩ or higher
      O147-21 (MIN+) or W14-2 (MCO+) - Body ground Always 10 kΩ or higher
      O147-22 (MIN-) or W14-4 (MCO-) - Body ground Always 10 kΩ or higher
      O147-24 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK RADIO RECEIVER ASSEMBLY


    1. B004G44C33
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Remove the radio receiver assembly with the connector(s) still connected.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O147-23 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O147-22 (MIN-) - Body ground Always Below 1 Ω
      O147-24 (SGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY (OUTPUT TO RADIO RECEIVER ASSEMBLY)

    B004F1HC31
    *a

    Component with harness connected

    (Telephone Microphone Assembly)

    1. Check the output waveform.


      1. Remove the telephone microphone assembly with the connector(s) still connected.

        Click here

      2. Connect an oscilloscope to terminal W14-2 (MCO+) and W14-4 (MCO-).

      3. Turn the power switch on (ACC).

      4. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Measurement terminal W14-2 (MCO+) - W14-4 (MCO-)
        Tool setting 50 mV/DIV., 500 ms/DIV.
        Vehicle condition

        1. Power switch on (ACC)

        2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.
        OK
        The waveform is similar to that shown in the illustration.

        Tech Tips

        The oscilloscope waveform shown in the illustration is an example for reference only.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here