AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) 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 sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

A01EUP4E02

INSPECTION PROCEDURE

PROCEDURE


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


    1. Disconnect the radio receiver assembly and roof console box assembly (telephone microphone assembly) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I150-6 (SNS2) - S7-15 (SNS2) Always Below 1 Ω
      I150-4 (MACC) - S7-14 (MACC) Always Below 1 Ω
      I150-5 (MIN+) - S7-13 (MCO+) Always Below 1 Ω
      I150-19 (MIN-) - S7-12 (MCO-) Always Below 1 Ω
      I150-6 (SNS2) - Body ground Always 10 kΩ or higher
      I150-4 (MACC) - Body ground Always 10 kΩ or higher
      I150-5 (MIN+) - Body ground Always 10 kΩ or higher
      I150-19 (MIN-) - Body ground Always 10 kΩ or higher
      I150-18 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT RADIO RECEIVER ASSEMBLY


    1. Reconnect the radio receiver assembly connector.

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

    3. A01EWM5E61
      Text in Illustration
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I150-4 (MACC) - Body ground Ignition switch 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
      I150-18 (SGND) - Body ground Always Below 1 Ω
      I150-19 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


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

    2. A01ETPAE13
      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
      S7-12 (MCO-) - S7-15 (SNS2) Always Below 1 Ω

    NG

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

    OK

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


    1. Reconnect the radio receiver assembly connector.

    2. A01ETHDE14
      Text in Illustration
      *a

      Component with harness connected

      (Roof console box Assembly (Telephone microphone assembly))

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

    3. Turn the ignition switch to ACC.

    4. Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the 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 is output A
      A waveform synchronized with the voice input to the roof console box assembly is not output B

    B

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

    A

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