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

DESCRIPTION

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

WIRING DIAGRAM

A0048EWE02
*a (Shielded)
*b Amplifier Microphone Assembly
*c Radio Receiver Assembly

PROCEDURE


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


    1. Disconnect the F47 radio receiver assembly connector.

    2. Disconnect the F95 amplifier microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F47-6 (SNS2) - F95-4 (SNS2) Always Below 1 Ω
      F47-4 (MACC) - F95-1 (MACC) Always Below 1 Ω
      F47-5 (MIN+) - F95-2 (MCO+) Always Below 1 Ω
      F47-19 (MIN-) - F95-3 (MCO-) Always Below 1 Ω
      F47-6 (SNS2) - Body ground Always 10 kΩ or higher
      F47-4 (MACC) - Body ground Always 10 kΩ or higher
      F47-5 (MIN+) - Body ground Always 10 kΩ or higher
      F47-19 (MIN-) - Body ground Always 10 kΩ or higher
      F47-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY


    1. Reconnect the radio receiver assembly connector.

    2. Reconnect the F95 amplifier microphone assembly connector.

    3. A0046YEC01
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F47-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F47-18 (SGND) - Body ground Always Below 1 Ω
      F47-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT AMPLIFIER MICROPHONE ASSEMBLY


    1. Disconnect the amplifier microphone assembly connector.

    2. A0046WXC01
      *a

      Component without harness connected

      (Amplifier Microphone Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F95-3 (MCO-) - F95-4 (SNS2) Always Below 1 Ω

    NG

    REPLACE AMPLIFIER MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT AMPLIFIER MICROPHONE ASSEMBLY


    1. Reconnect the F47 radio receiver assembly connector.

    2. A0048NAC01
      *a

      Component with harness connected

      (Amplifier Microphone Assembly)

      Reconnect the amplifier microphone assembly connector.

    3. Turn the ignition switch to ACC.

    4. Connect an oscilloscope to terminals 2 (MCO+) and 3 (MCO-) of the amplifier microphone assembly connector.

    5. 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

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

    B

    REPLACE AMPLIFIER MICROPHONE ASSEMBLY Click here