AUDIO AND VISUAL SYSTEM(for Radio and Display Type) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

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

Using this circuit, the radio and display receiver assembly sends power to the amplifier microphone assembly, and the amplifier microphone assembly sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM

A004FNOE18
*a (Shielded)
*b Amplifier Microphone Assembly
*c Radio and Display Receiver Assembly

PROCEDURE


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


    1. Disconnect the F69 radio and display receiver assembly connector.

    2. Disconnect the F34 amplifier microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F69-6 (SNS2) - F34-4 (SNS2) Always Below 1 Ω
      F69-4 (MACC) - F34-1 (MACC) Always Below 1 Ω
      F69-5 (MIN+) - F34-2 (MCO+) Always Below 1 Ω
      F69-19 (MIN-) - F34-3 (MCO-) Always Below 1 Ω
      F69-6 (SNS2) - Body ground Always 10 kΩ or higher
      F69-4 (MACC) - Body ground Always 10 kΩ or higher
      F69-5 (MIN+) - Body ground Always 10 kΩ or higher
      F69-19 (MIN-) - Body ground Always 10 kΩ or higher
      F69-18 (SGND) - Body ground Always 10 kΩ or higher

    4. Reconnect the amplifier microphone assembly connector.

    5. Reconnect the radio and display receiver assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A004F60E02
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F69-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F69-18 (SGND) - Body ground Always Below 1 Ω
      F69-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT AMPLIFIER MICROPHONE ASSEMBLY


    1. A004FAHE11
      Text in Illustration
      *a

      Component without harness connected

      (Amplifier Microphone Assembly)

      Remove the amplifier microphone assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 (SNS2) - 3 (MCO-) Always Below 1 Ω

    NG

    REPLACE AMPLIFIER MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK AMPLIFIER MICROPHONE ASSEMBLY


    1. A004G4KE02
      Text in Illustration
      *a

      Component with harness connected

      (Amplifier Microphone Assembly)

      Turn the ignition switch to ACC.

    2. Connect an oscilloscope to terminals 2 (MCO+) and 3 (MCO-).

    3. Check the waveform of the amplifier microphone assembly using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the amplifier microphone assembly is output A
      A waveform synchronized with the voice input to the amplifier microphone assembly is not output B

    A

    END

    B

    REPLACE AMPLIFIER MICROPHONE ASSEMBLY Click here