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

DESCRIPTION

Using this circuit, the multi-media module receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone signals to the multi-media module receiver assembly.

WIRING DIAGRAM

A01X4FKE03
*1 Shielded
*2 Telephone Microphone Assembly
*3 Map Light Assembly
*4 Multi-media Module Receiver Assembly

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the F77 multi-media module receiver assembly connector.

    2. Disconnect the R7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-49 (SNS2) - R7-20 (SNS2) Always Below 1 Ω
      F77-29 (MACC) - R7-25 (ACC) Always Below 1 Ω
      F77-27 (MIN+) - R7-27 (MI1+) Always Below 1 Ω
      F77-48 (MIN-) - R7-26 (MIC-) Always Below 1 Ω
      F77-49 (SNS2) - Body ground Always 10 kΩ or higher
      F77-29 (MACC) - Body ground Always 10 kΩ or higher
      F77-27 (MIN+) - Body ground Always 10 kΩ or higher
      F77-48 (MIN-) - Body ground Always 10 kΩ or higher
      F77-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. Reconnect the multi-media module receiver assembly connector.

    2. A01WZ45E01
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-28 (SGND) - Body ground Always Below 1 Ω
      F77-48 (MIN-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F77-29 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

    OK

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

    NG

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01X4QVE01
      Text in Illustration
      *a

      Component without harness connected

      (Map Light Assembly)

      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
      26 (MIC-) - 20 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. CHECK MAP LIGHT ASSEMBLY


    1. Reconnect the multi-media module receiver assembly connector.

    2. A01X9VCE01
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      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 the oscilloscope.

      Result
      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly is not output. A
      A waveform synchronized with the voice input to the map light assembly is output. B

    B

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

    A

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same malfunction recurs.

      Result
      Result Proceed to

      Malfunction does not recur

      (returns to normal).

      		 A
      Malfunction recurs. B

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    B

    REPLACE MAP LIGHT ASSEMBLY Click here