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

DESCRIPTION

The radio and display receiver assembly and telephone 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 telephone microphone assembly, and the telephone microphone assembly sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM

B006OO7E42
*a (Shielded)
*b Telephone Microphone Assembly
*c Radio and Display Receiver Assembly

PROCEDURE


  1. CHECK MICROPHONE (OPERATION CHECK)


    1. B006KLX

      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 F39 radio and display receiver assembly connector.

    2. Disconnect the S18 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F39-6 (SNS2) - S18-3 (SNS2) Always Below 1 Ω
      F39-4 (MACC) - S18-1 (MACC) Always Below 1 Ω
      F39-5 (MIN+) - S18-2 (MCO+) Always Below 1 Ω
      F39-19 (MIN-) - S18-4 (MCO-) Always Below 1 Ω
      F39-6 (SNS2) - Body ground Always 10 kΩ or higher
      F39-4 (MACC) - Body ground Always 10 kΩ or higher
      F39-5 (MIN+) - Body ground Always 10 kΩ or higher
      F39-19 (MIN-) - Body ground Always 10 kΩ or higher
      F39-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Reconnect the F39 radio and display receiver assembly connector.

    2. Reconnect the S18 telephone microphone assembly connector.

    3. B006LDWC02
      *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 Condition Specified Condition
      F39-4 (MACC) - Body ground Engine 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
      F39-18 (SGND) - Body ground Always Below 1 Ω
      F39-19 (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. Remove the telephone microphone assembly.

      Click here

    2. Inspect the telephone microphone assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. INSPECT TELEPHONE MICROPHONE ASSEMBLY


    1. Reconnect the F39 radio and display receiver assembly connector.

    2. Reconnect the S18 telephone microphone assembly connector.

    3. Turn the engine switch to ACC.

    4. B006R4VC60
      *a

      Component with harness connected

      (Telephone Microphone Assembly)

      Connect an oscilloscope to terminals 13 (MIC+) and 12 (MIC-) of the S18 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

  6. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one.

      Click here

    2. Check if the same malfunction recurs.

      Result
      Result Proceed to
      Malfunction does not recur (returns to normal). A
      Malfunction recurs. B

    A

    END

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here