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

DESCRIPTION

Microphone signal from the microphone amplifier assembly is sent to the radio and display assembly. Also, power is supplied from the radio and display assembly to the microphone amplifier assembly.

WIRING DIAGRAM

A005H24E45
*a (Shielded)
*b MAP LIGHT ASSEMBLY (MICROPHONE AMPLIFIER ASSEMBLY)
*c RADIO AND DISPLAY ASSEMBLY

PROCEDURE


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


    1. Disconnect the F47 radio and display assembly connector.

    2. Disconnect the L8 map light assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F47-6 (SNS2) - L8-4 (SNS2) Always Below 1 Ω
      F47-4 (MACC) - L8-1 (MACC) Always Below 1 Ω
      F47-5 (MIN+) - L8-2 (MCO+) Always Below 1 Ω
      F47-19 (MIN-) - L8-3 (MCO-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F47-6 (SNS2) - Body ground Always 10 kΩ or higher
      F47-4 (MACC) - Body ground Always 10 kΩ or higher
      F47-5 (MIN+) - Body ground Always 10 kΩ or higher
      F47-19 (MIN-) - Body ground Always 10 kΩ or higher
      F47-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO AND DISPLAY ASSEMBLY


    1. Reconnect the F47 radio and display assembly connector.

    2. A005LLJE02
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Assembly)

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F47-4 (MACC) - Body ground Ignition 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
      F47-18 (SGND) - Body ground Always Below 1 Ω
      F47-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO AND DISPLAY ASSEMBLY Click here

    OK

  3. CHECK MICROPHONE AMPLIFIER ASSEMBLY


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L8-4 (SNS2) - L8-3 (MCO-) Always Below 1 Ω

    NG

    REPLACE MICROPHONE AMPLIFIER ASSEMBLY Click here

    OK

  4. CHECK MICROPHONE AMPLIFIER ASSEMBLY


    1. Reconnect the F47 radio and display assembly connector.

    2. Reconnect the L8 map light assembly connector.

    3. Turn the ignition switch to ACC.

    4. A005JYSE02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly (Microphone Amplifier Assembly))

      Connect an oscilloscope to terminals 4 (MCO+) and 3 (MCO-) of the U1 map light assembly connector.

    5. Check the waveform of the microphone amplifier 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

    REPLACE MICROPHONE AMPLIFIER ASSEMBLY Click here