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 roof console box assembly (telephone microphone assembly), and the roof console box assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

A0004SRE01
*a (Shielded)
*b Roof Console Box Assembly (Telephone Microphone Assembly)
*c Radio Receiver Assembly

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the T11 roof console box assembly (telephone microphone assembly) connector.

    2. Disconnect the H84 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H84-1 (SNS2) - T11-1 (SNS2) Always Below 1 Ω
      H84-2 (MIN+) - T11-3 (MCO+) Always Below 1 Ω
      H84-3 (MACC) - T11-4 (MACC) Always Below 1 Ω
      H84-5 (MIN-) - T11-2 (MCO-) Always Below 1 Ω
      H84-1 (SNS2) - Body ground Always 10 kΩ or higher
      H84-2 (MIN+) - Body ground Always 10 kΩ or higher
      H84-3 (MACC) - Body ground Always 10 kΩ or higher
      H84-5 (MIN-) - Body ground Always 10 kΩ or higher
      H84-6 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY


    1. A00046BE01
      Text in Illustration
      *a

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the H84 radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H84-3 (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
      H84-5 (MIN-) - Body ground Always Below 1 Ω
      H84-6 (SGND) - Body ground Always Below 1 Ω

    4. Proceed to the next step based on the inspection result.

      Result
      Result Proceed to
      NG A
      OK B

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    B

  3. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the T11 roof console box assembly (telephone microphone assembly) connector.

    2. A00058IE02
      Text in Illustration
      *a

      Component without harness connected

      (Roof Console Box Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T11-2 (MCO-) - T11-1 (SNS2) Always Below 1 Ω

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  4. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)


    1. Reconnect the H84 radio receiver assembly connector.

    2. A00072XE01
      Text in Illustration
      *a

      Component with harness connected

      (Roof Console Box Assembly (Telephone Microphone Assembly))

      Reconnect the T11 roof console box assembly (telephone microphone assembly) connector.

    3. Turn the power switch on (ACC).

    4. Connect an oscilloscope to terminals 3 (MCO+) and 2 (MCO-) of the T11 roof console box 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 roof console box assembly (telephone microphone assembly) is output A
      A waveform synchronized with the voice input to the roof console box assembly (telephone microphone assembly) is not output B

    A

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

    B

  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

    A

    END

    B

    REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here