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

DESCRIPTION

Using this circuit, the radio and display receiver assembly sends power to the map light assembly, and the roof console box assembly sends microphone signals to the radio and display receiver assembly.

WIRING DIAGRAM

A01QR6GE04
*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 G143 radio and display receiver assembly connector.

    2. Disconnect the Q7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G143-6 (SNS2) - Q7-12 (SNS2) Always Below 1 Ω
      G143-4 (MACC) - Q7-11 (MACC) Always Below 1 Ω
      G143-5 (MIN+) - Q7-10 (MCO+) Always Below 1 Ω
      G143-19 (MIN-) - Q7-9 (MCO-) Always Below 1 Ω
      G143-6 (SNS2) - Body ground Always 10 kΩ or higher
      G143-4 (MACC) - Body ground Always 10 kΩ or higher
      G143-5 (MIN+) - Body ground Always 10 kΩ or higher
      G143-19 (MIN-) - Body ground Always 10 kΩ or higher
      G143-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Remove the radio and display receiver assembly with its connector still connected.

      Click here

    2. A01QR5LC03
      *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
      G143-4 (MACC) - Body ground Ignition switch ACC 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G143-18 (SGND) - Body ground Always Below 1 Ω
      G143-19 (MIN-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01QP53E01

      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
      12 (SNS2) - 9 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. A01QTN1C01
      *a

      Component with harness connected

      (Map Light Assembly)

      Remove the map light assembly with its connector still connected.

      Click here

    2. Turn the ignition switch to ACC.

    3. Connect an oscilloscope to terminals 10 (MCO+) and 9 (MCO-) of the map light assembly connector.

    4. Check the waveform of the telephone microphone 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 new or known good one and check that the malfunction disappears.

      Click here

      Result
      Proceed to
      Malfunction disappears
      Malfunction appears

    Malfunction disappears

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    Malfunction appears

  6. CHECK MAP LIGHT ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one and check that the malfunction disappears.

      Click here

      Result
      Proceed to
      Malfunction disappears
      Malfunction appears

    Malfunction disappears

    END (MAP LIGHT ASSEMBLY IS DEFECTIVE)

    Malfunction appears

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  7. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or known good one and check that the malfunction disappears.

      Click here

      Result
      Proceed to
      Malfunction disappears
      Malfunction appears

    Malfunction disappears

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    Malfunction appears

    REPLACE MAP LIGHT ASSEMBLY Click here