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

A01ITSPE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the H105 radio and display receiver assembly connector.

    2. Disconnect the Q10 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H105-6 (SNS2) - Q10-4 (SNS2) Always Below 1 Ω
      H105-4 (MACC) - Q10-15 (MACC)
      H105-5 (MIN+) - Q10-14 (MIC+)
      H105-19 (MIN-) - Q10-13 (MIC-)
      H105-6 (SNS2) - Body ground Always 10 kΩ or higher
      H105-4 (MACC) - Body ground
      H105-5 (MIN+) - Body ground
      H105-19 (MIN-) - Body ground
      H105-18 (SGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01ITRVE06
      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
      H105-4 (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
      H105-18 (SGND) - Body ground Always Below 1 Ω
      H105-19 (MIN-) - Body ground

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01IU09E04

      Remove the map light 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) - 13 (MIC-) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. A01IQYKE02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the ignition switch to ACC.

    2. Connect an oscilloscope to terminals 14 (MIC+) and 13 (MIC-).

    3. Check the waveform of the map light assembly using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly is output A
      A waveform synchronized with the voice input to the map light assembly is not output B

    B

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    A

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

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same problem occurs again.

      Result
      Result Proceed to
      Malfunction disappears A
      Malfunction does not disappear B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)