AUDIO AND VISUAL SYSTEM (w/o Navigation System) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

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

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

WIRING DIAGRAM

A015ADKE09

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A0159ZJE18
      Text in Illustration
      *1

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the F54 radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F54-3 (MACC) - Body ground Engine switch on (IG) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F54-6 (SGND) - Body ground Always Below 1 Ω
      F54-5 (MIN-) - 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 R7 map light assembly and F54 radio receiver assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R7-20 (SNS2) - F54-1 (SNS2) Always Below 1 Ω
      R7-27 (MI1+) - F54-2 (MIN+) Always Below 1 Ω
      R7-26 (MIC-) - F54-5 (MIN-) Always Below 1 Ω
      R7-25 (ACC) - F54-3 (MACC) Always Below 1 Ω
      R7-20 (SNS2) - Body ground Always 10 kΩ or higher
      R7-27 (MI1+) - Body ground Always 10 kΩ or higher
      R7-26 (MIC-) - Body ground Always 10 kΩ or higher
      R7-25 (ACC) - Body ground Always 10 kΩ or higher
      F54-6 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A0159A4E09
      Text in Illustration
      *1

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R7-20 (SNS2) - R7-26 (MIC-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. A015B8SE07
      Text in Illustration
      *1

      Component with harness connected

      (Map Light Assembly)

      Reconnect the radio receiver assembly connector.

    2. Reconnect the map light assembly connector.

    3. Turn the engine switch on (ACC).

    4. Connect an oscilloscope to terminals R7-27 (MI1+) and R7-26 (MIC-) of the map light assembly connector.

    5. Check the waveform of the telephone microphone assembly using an oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the telephone microphone assembly is output A
      A waveform synchronized with the voice input to the telephone microphone assembly is not output B

    B

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    A

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

  5. 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