AUDIO AND VISUAL SYSTEM(for Radio Receiver 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 receiver assembly sends power to the telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

E290228E01

PROCEDURE

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

    1. Disconnect the E55 radio 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

      E55-4 (MIN+) - M2-3 (MCO+)

      Always

      Below 1 Ω

      E55-18 (MIN-) - M2-1 (MCO-)

      Always

      Below 1 Ω

      E55-4 (MIN+) - Body ground

      Always

      10 kΩ or higher

      E55-18 (MIN-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY

    1. Disconnect the E55 radio receiver assembly connector.

    2. E221758C16

      *a

      Component without harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E55-18 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

    OK

  3. INSPECT TELEPHONE MICROPHONE ASSEMBLY

    1. Reconnect the E55 radio receiver assembly connector.

    2. Reconnect the M2 telephone microphone assembly connector.

    3. Turn the ignition switch to ACC.

    4. 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.

    5. 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