AUDIO AND VISUAL SYSTEM (w/o Multi-display) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

A019K5OE33

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the T10 map light assembly (telephone microphone assembly) connector.

    2. Disconnect the G10 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G10-1 (SNS2) - T10-36 (SNS2) Always Below 1 Ω
      G10-3 (MACC) - T10-33 (MACC) Always Below 1 Ω
      G10-2 (MIN+) - T10-34 (MCO+) Always Below 1 Ω
      G10-5 (MIN-) - T10-35 (MCO-) Always Below 1 Ω
      G10-1 (SNS2) - Body ground Always 10 kΩ or higher
      G10-3 (MACC) - Body ground Always 10 kΩ or higher
      G10-2 (MIN+) - Body ground Always 10 kΩ or higher
      G10-5 (MIN-) - Body ground Always 10 kΩ or higher
      G10-6 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY


    1. Disconnect the G10 radio receiver assembly connector.

    2. A019OUVE46
      Text in Illustration
      *a

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the T10 map light assembly (telephone microphone assembly) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G10-3 (MACC) - Body ground Engine switch on (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
      G10-6 (SGND) - Body ground Always Below 1 Ω
      G10-5 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. A019P11E07
      Text in Illustration
      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T10-35 (MCO-) - T10-36 (SNS2) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Reconnect the G10 radio receiver assembly connector.

    2. A019NJZE09
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

      Reconnect the T10 map light assembly (telephone microphone assembly) connector.

    3. Turn the engine switch on (ACC).

    4. Connect an oscilloscope to terminals 34 (MCO+) and 35 (MCO-) of the T10 map light assembly (telephone microphone 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 (telephone microphone assembly) is output A
      A waveform synchronized with the voice input to the map light assembly (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 (TELEPHONE MICROPHONE ASSEMBLY) Click here

    A

    END