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

DTC Code DTC Name
Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

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

WIRING DIAGRAM

E287054E02

PROCEDURE

  1. CHECK MICROPHONE (OPERATION CHECK)

    1. E277821

      Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.

      Click here

    2. When a 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

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

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

    1. Disconnect the E32 radio and display receiver assembly connector.

    2. Disconnect the M2 telephone microphone assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E32-4 (MIN+) - M2-3 (MCO+)

      Always

      Below 1 Ω

      E32-18 (MIN-) - M2-1 (MCO-)

      Always

      Below 1 Ω

      E32-4 (MIN+) - Body ground

      Always

      Below 20 kΩ

      E32-18 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. Disconnect the E32 radio and display receiver assembly connector.

    2. E221758C15

      *a

      Component without harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E32-18 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    OK

  4. INSPECT TELEPHONE MICROPHONE ASSEMBLY

    1. Turn the ignition switch to ACC.

    2. E287056C02

      *a

      Component with harness connected

      (Telephone Microphone Assembly)

      Connect an oscilloscope to terminals 3 (MCO+) and 1 (MCO-) of the M2 telephone microphone assembly connector.

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

      Result

      Result

      Proceed to

      A waveform synchronized with the voice input to the telephone microphone assembly is output.

      A

      A waveform synchronized with the voice input to the telephone microphone assembly is not output.

      B
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY

    Click here