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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 171 (Audio / Video System (Hybrid) - Symptom Tests & Circuit Tests) >> AUDIO AND VISUAL SYSTEM (for HV Model) >> Microphone Circuit [10/2019 - 08/2021] >> Procedure

Microphone Circuit [10/2019 - 08/2021]: Procedure

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  1. CHECK MICROPHONE (OPERATION CHECK) 
    1. Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio receiver assembly) in Operation Check.

      Refer to OPERATION CHECK [10/2019 - 08/2021]

      GTY434237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. When voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

      OK

      Check result is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2019 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

    Result: 

    NG 

    See step  2

  2. CHECK MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/ Manual (SOS) Switch A
      w/o Manua8l (SOS) Switch B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G4 radio receiver assembly connector.
    2. Disconnect the P18 telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-25 (SNS2) - P18-3 (SNS2) Always Below 1 Ω
      G4-25 (SNS2) or P18-3 (SNS2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the G4 radio receiver assembly connector.
    2. Disconnect the G128 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-21 (MIN+) - G128-16 (MCO+) Always Below 1 Ω
      G4-22 (MIN-) - G128-32 (MCO-) Always Below 1 Ω
      G4-21 (MIN+) or G128-16 (MCO+) - Body ground Always 10 kΩ or higher
      G4-22 (MIN-) or G128-32 (MCO-) - Body ground Always 10 kΩ or higher
      G4-24 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G128 DCM (telematics transceiver) connector.
    2. Disconnect the P18 telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G128-5 (MCVD) - P18-1 (MACC) Always Below 1 Ω
      G128-6 (MCI+) - P18-2 (MCO+) Always Below 1 Ω
      G128-7 (MCI-) - P18-4 (MCO-) Always Below 1 Ω
      G128-5 (MCVD) or P18-1 (MACC) - Body ground Always 10 kΩ or higher
      G128-6 (MCI+) or P18-2 (MCO+) - Body ground Always 10 kΩ or higher
      G128-7 (MCI-) or P18-4 (MCO-) - Body ground Always 10 kΩ or higher
      G128-23 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver) with the connector(s) still connected.
      GTY961425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G128-5 (MCVD) - 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
      G128-23 (SGND) - Body ground Always Below 1 Ω
      G128-7 (MCI-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

    Result: 

    OK 

    See step  7

  7. CHECK TELEPHONE MICROPHONE ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)) 
    GTY838418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Telephone Microphone Assembly)
    1. Check the output waveform.
      1. Remove the telephone microphone assembly with the connector(s) still connected.

        Refer to REMOVAL [06/2018 - 08/2021]

      2. Connect an oscilloscope to terminal P18-2 (MCO+) and P18-4 (MCO-).
      3. Turn the power switch on (ACC).
      4. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Measurement terminal P18-2 (MCO+) - P18-4 (MCO-)
        Tool setting 50 mV/DIV., 500 ms/DIV.
        Vehicle condition
        1. Power switch on (ACC)
        2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        The oscilloscope waveform shown in the illustration is an example for reference only.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    OK 

    See step  8

  8. CHECK DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO RECEIVER ASSEMBLY) 
    GTY962625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (DCM (Telematics Transceiver))
    1. Check the output waveform.
      1. Remove the DCM (telematics transceiver) with the connector(s) still connected.

        Refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022]

      2. Connect an oscilloscope to terminal G128-16 (MCO+) and G128-32 (MCO-).
      3. Turn the power switch on (ACC).
      4. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Measurement terminal G128-16 (MCO+) - G128-32 (MCO-)
        Tool setting 50 mV/DIV., 500 ms/DIV.
        Vehicle condition
        1. Power switch on (ACC)
        2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        The oscilloscope waveform shown in the illustration is an example for reference only.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

  9. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G4 radio receiver assembly connector.
    2. Disconnect the P18 telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G4-25 (SNS2) - P18-3 (SNS2) Always Below 1 Ω
      G4-23 (MACC) - P18-1 (MACC) Always Below 1 Ω
      G4-21 (MIN+) - P18-2 (MCO+) Always Below 1 Ω
      G4-22 (MIN-) - P18-4 (MCO-) Always Below 1 Ω
      G4-25 (SNS2) or P18-3 (SNS2) - Body ground Always 10 kΩ or higher
      G4-23 (MACC) or P18-1 (MACC) - Body ground Always 10 kΩ or higher
      G4-21 (MIN+) or P18-2 (MCO+) - Body ground Always 10 kΩ or higher
      G4-22 (MIN-) or P18-4 (MCO-) - Body ground Always 10 kΩ or higher
      G4-24 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK RADIO RECEIVER ASSEMBLY 
    1. Remove the radio receiver assembly with the connector(s) still connected.
      GTY793155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio Receiver Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G4-23 (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
      G4-22 (MIN-) - Body ground Always Below 1 Ω
      G4-24 (SGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

    Result: 

    OK 

    See step  11

  11. CHECK TELEPHONE MICROPHONE ASSEMBLY (OUTPUT TO RADIO RECEIVER ASSEMBLY) 
    GTY825879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Telephone Microphone Assembly)
    1. Check the output waveform.
      1. Remove the telephone microphone assembly with the connector(s) still connected.

        Refer to REMOVAL [06/2018 - 08/2021]

      2. Connect an oscilloscope to terminal P18-2 (MCO+) and P18-4 (MCO-).
      3. Turn the power switch on (ACC).
      4. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Measurement terminal P18-2 (MCO+) - P18-4 (MCO-)
        Tool setting 50 mV/DIV., 500 ms/DIV.
        Vehicle condition
        1. Power switch on (ACC)
        2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the telephone microphone assembly sound holes in the roof headlining holder cover.

        OK

        The waveform is similar to that shown in the illustration.

        HINT: 

        The oscilloscope waveform shown in the illustration is an example for reference only.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

    Result: 

    NG 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021] 

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