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

A01NCUZE07

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A01NGCQE07
      Text in Illustration
      *1

      Component without 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
      G10-3 (MACC) - Body ground Power switch on (IG) 4 to 6 V

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. A01NEXGE04
      A01NGEQE42

      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
      T10-36 (SNS2) - G10-1 (SNS2) Always Below 1 Ω
      T10-34 (MCO+) - G10-2 (MIN+) Always Below 1 Ω
      T10-35 (MCO-) - G10-5 (MIN-) Always Below 1 Ω
      T10-33 (MACC) - G10-3 (MACC) Always Below 1 Ω
      T10-36 (SNS2) - Body ground Always 10 kΩ or higher
      T10-34 (MCO+) - Body ground Always 10 kΩ or higher
      T10-35 (MCO-) - Body ground Always 10 kΩ or higher
      T10-33 (MACC) - Body ground Always 10 kΩ or higher
      G10-6 (SGND) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Map Light Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. A01NGJIE01
      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
      T10-36 (SNS2) - T10-35 (MCO-) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. A01NEI1E01
      Text in Illustration
      *1

      Component with harness connected

      (Map Light Assembly)

      Reconnect the radio receiver assembly and map light assembly connectors.

    2. Turn the power switch on (ACC).

    3. Connect an oscilloscope to terminals T10-34 (MCO+) and T10-35 (MCO-) of the map light assembly connector.

    4. 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

    A

    END