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

DESCRIPTION

This circuit sends the voice signal from the map light assembly (telephone microphone assembly) to the radio receiver assembly.

It also supplies power from the radio receiver assembly to the map light assembly (telephone microphone assembly).

WIRING DIAGRAM

A003RIDE07

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A003TVKE36
      Text in Illustration
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Disconnect the radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E98-3 (MACC) - Body ground Power switch on (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
      E98-6 (SGND) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the map light assembly and radio receiver assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O8-12 (MACC) - E98-3 (MACC) Always Below 1 Ω
      O8-11 (MIC+) - E98-2 (MIN+) Always Below 1 Ω
      O8-10 (MIC-) - E98-5 (MIN-) Always Below 1 Ω
      E98-1 (SNS2) - Body ground Always Below 1 Ω
      E98-3 (MACC) - Body ground Always 10 kΩ or higher
      E98-2 (MIN+) - Body ground Always 10 kΩ or higher
      E98-5 (MIN-) - Body ground Always 10 kΩ or higher
      E98-6 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. Reconnect the radio receiver assembly connector.

    2. A003T39E58
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Reconnect the map light assembly connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals 11 (MlC+) and 10 (MIC-) of the O8 map light assembly connector.

    5. Check the waveform of the microphone using the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the overhead junction block is output A
      A waveform synchronized with the voice input to the overhead junction block is not output B

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    A

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

  4. REPLACE TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly Click here.

    2. Check if the same malfunction recurs.

      Result
      Result Proceed to

      Malfunction does not recur

      (returns to normal)

      		 A
      Malfunction recurs B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END