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

A00557VE13
*a Telephone Microphone Assembly
*b Shielded
*c Map Light Assembly
*d Radio and Display Receiver Assembly

PROCEDURE


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


    1. Disconnect the D124 radio and display receiver assembly connector.

    2. Disconnect the K13 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D124-6 (SNS2) - K13-5 (SNS2) Always Below 1 Ω
      D124-4 (MACC) - K13-16 (MACC) Always Below 1 Ω
      D124-5 (MIN+) - K13-15 (MIC+) Always Below 1 Ω
      D124-19 (MIN-) - K13-14 (MIC-) Always Below 1 Ω
      D124-6 (SNS2) - Body ground Always 10 kΩ or higher
      D124-4 (MACC) - Body ground Always 10 kΩ or higher
      D124-5 (MIN+) - Body ground Always 10 kΩ or higher
      D124-19 (MIN-) - Body ground Always 10 kΩ or higher
      D124-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A0058GVE02
      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
      D124-4 (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
      D124-18 (SGND) - Body ground Always Below 1 Ω
      D124-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. CHECK MAP LIGHT ASSEMBLY


    1. A0055RHE09

      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
      5 (SNS2) - 14 (MIC-) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. A0057FGE02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the ignition switch to ACC.

    2. Connect an oscilloscope to terminals 15 (MIC+) and 14 (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

    A

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

    B

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a known good one Click here.

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

  6. CHECK MAP LIGHT ASSEMBLY


    1. Replace the map light assembly with a known good one Click here.

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    OK

    END (MAP LIGHT ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  7. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a known good one Click here.

    2. Check if the same problem occurs again.

      OK
      Malfunction disappears.

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here