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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Audio / Video System (For 8 Inch Display) - Diagnostic Codes (2 Of 2) & Symptom Tests) >> AUDIO AND VISUAL SYSTEM (for 8 Inch Display) >> Microphone Circuit [09/2022 - ] >> Procedure

Microphone Circuit [09/2022 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 300h, 2024 Lexus ES 250, 2023 Lexus ES 350, and 2023 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MODEL 

    Result

    Result Proceed to
    w/ DCM (Telematics Transceiver) A
    w/o DCM (telematics Transceiver) B

    Result: 

    B 

    See step  15

    Result: 

    A 

    See step  2

  2. CHECK MICROPHONE 
    1. Enter diagnostic mode.
      GTY1069377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Mic 1 Input Level
      *b Mic 2 Input Level

      Refer to DIAGNOSIS SYSTEM [09/2022 - ]

    2. Select "Function Check/Setting" from the "Service Menu" screen.
    3. Select "Microphone Check" from the "Function Check/Setting I" screen.
    4. Speak into each microphone assembly and check the microphone input level gauge display.

      OK

      The microphone input levels of the gauge change in accordance with the voice.

      Result

      Result Proceed to
      Microphone input levels change for microphone 1 and 2 A
      Microphone input level does not change for microphone 1 B
      Microphone input level does not change for microphone 2 C

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY RH) 
    1. Disconnect the G145 radio receiver assembly connector.
    2. Disconnect the P23 telephone microphone assembly RH connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G145-17(MI2+) - P23-2(MO2+) Always Below 1 Ω
      G145-18(MI2-) - P23-4(MO2-) Always Below 1 Ω
      G145-20(MAC2) - P23-1(MAC2) Always Below 1 Ω
      G145-21(SNS2) - P23-5(SNS2) Always Below 1 Ω
      G145-17(MI2+) or P23-2(MO2+) - Body ground Always 10 kΩ or higher
      G145-18(MI2-) or P23-4(MO2-) - Body ground Always 10 kΩ or higher
      G145-20(MAC2) or P23-1(MAC2) - Body ground Always 10 kΩ or higher
      G145-21(SNS2) or P23-5(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 RADIO RECEIVER ASSEMBLY (MACC, MIN-) 
    1. With the G145 radio receiver assembly connector connected, disconnect the P23 telephone microphone assembly RH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P23-4(MO2-) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P23-1(MAC2) - Body ground IG ON 7.5 to 8.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY RH (OUTPUT TO RADIO RECEIVER ASSEMBLY) 
    1. Using an oscilloscope, measure the waveform according to the condition(s) in the table below.
      Item Condition
      Tester Connection P23-2(MO2+) - P23-4(MO2-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ON
      2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the microphone case RH sound holes.
      GTY1124209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Telephone microphone assembly RH)

      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.
      • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

      Result

      Result Proceed to
      A waveform synchronized with voice signals is output A
      A waveform synchronized with voice signals is not output B

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY LH. Refer to  REMOVAL [09/2022 - ] 

  6. CHECK DCM (TELEMATICS TRANSCEIVER) (MICROPHONE POWER SOURCE AND BODY GROUND) 

    HINT: 

    Measure the connector of the DCM (telematics transceiver) while it is connected.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G128-7(MCI-) - Body ground Always Below 1 Ω
      G128-23(SGND) - Body ground Always Below 1 Ω
      GTY1123190Courtesy 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 IG ON 7.5 to 8.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  7

  7. CHECK DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO RECEIVER ASSEMBLY) 

    HINT: 

    Measure the connector of the DCM (telematics transceiver) while it is connected.

    1. Using an oscilloscope, measure the waveform according to the condition(s) in the table below.
      Item Condition
      Tester Connection G128-16(MCO+) - G128-32(MCO-)
      Tool setting 50 mV/DIV, 500 ms/DIV
      Vehicle condition
      1. Turn the ignition switch to ON
      2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the microphone case LH sound holes.
      GTY1135166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics transceiver))

      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.
      • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

      Result

      Result Proceed to
      A waveform synchronized with voice signals is output A
      A waveform synchronized with voice signals is not output B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the G147 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
      G147-21(MIN+) - G128-16(MCO+) Always Below 1 Ω
      G147-22(MIN-) - G128-32(MCO-) Always Below 1 Ω
      G147-21(MIN+) or G128-16(MCO+) - Body ground Always 10 kΩ or higher
      G147-22(MIN-) or G128-32(MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the G147 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
      G147-21(MIN+) - G128-16(MCO+) Always Below 1 Ω
      G147-22(MIN-) - G128-32(MCO-) Always Below 1 Ω
      G147-21(MIN+) or G128-16(MCO+) - Body ground Always 10 kΩ or higher
      G147-22(MIN-) or G128-32(MCO-) - 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 HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - TELEPHONE MICROPHONE ASSEMBLY LH) 
    1. Disconnect the G128 DCM (telematics transceiver) connector.
    2. Disconnect the P24 telephone microphone assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G128-5(MCVD) - P24-1(MAC1) Always Below 1 Ω
      G128-6(MCI+) - P24-2(MO1+) Always Below 1 Ω
      G128-7(MCI-) - P24-4(MO1-) Always Below 1 Ω
      G128-5(MCVD) or P24-1(MAC1) - Body ground Always 10 kΩ or higher
      G128-6(MCI+) or P24-2(MO1+) - Body ground Always 10 kΩ or higher
      G128-7(MCI-) or P24-4(MO1-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY LH) 
    1. Disconnect the G147 radio receiver assembly connector.
    2. Disconnect the P24 telephone microphone assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G147-25(SNS) - P24-5(SNS1) Always Below 1 Ω
      G147-25(SNS) or P24-5(SNS1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK TELEPHONE MICROPHONE ASSEMBLY RH (OUTPUT TO TELEMATICS TRANSCEIVER) 
    1. Using an oscilloscope, measure the waveform according to the condition(s) in the table below.
      Item Condition
      Tester Connection P24-2(MO1+) - P24-4(MO1-)
      Tool setting 50 mV/DIV, 500 ms/DIV
      Vehicle condition
      1. Turn the ignition switch to ON
      2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the microphone case LH sound holes.
      GTY1124210Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Telephone microphone assembly LH)

      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.
      • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

      Result

      Result Proceed to
      A waveform synchronized with voice signals is output A
      A waveform synchronized with voice signals is not output B

    Result: 

    A 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY RH. Refer to  REMOVAL [09/2022 - ] 

  13. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G128 DCM (Telematics transceiver) connector.
    2. Disconnect the P24 telephone microphone assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G128-5(MCVD) - P24-1(MAC1) Always Below 1 Ω
      G128-6(MCI+) - P24-2(MO1+) Always Below 1 Ω
      G128-7(MCI-) - P24-4(MO1-) Always Below 1 Ω
      G128-5(MCVD) or P24-1(MAC1) - Body ground Always 10 kΩ or higher
      G128-6(MCI+) or P24-2(MO1+) - Body ground Always 10 kΩ or higher
      G128-7(MCI-) or P24-4(MO1-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the G147 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
      G147-21(MIN+) - G128-16(MCO+) Always Below 1 Ω
      G147-22(MIN-) - G128-32(MCO-) Always Below 1 Ω
      G147-21(MIN+) or G128-16(MCO+) - Body ground Always 10 kΩ or higher
      G147-22(MIN-) or G128-32(MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK MICROPHONE 
    1. Enter diagnostic mode.
      GTY1069377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Mic 1 Input Level
      *b Mic 2 Input Level

      Refer to DIAGNOSIS SYSTEM [09/2022 - ]

    2. Select "Function Check/Setting" from the "Service Menu" screen.
    3. Select "Microphone Check" from the "Function Check/Setting I" screen.
    4. Speak into each microphone assembly and check the microphone input level gauge display.

      OK

      The microphone input levels of the gauge change in accordance with the voice.

      Result

      Result Proceed to
      Microphone input levels change for microphone 1 and 2 A
      Microphone input level does not change for microphone 1 B
      Microphone input level does not change for microphone 2 C

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    C 

    See step  19

    Result: 

    B 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY LH) 
    1. Disconnect the G147 radio receiver assembly connector.
    2. Disconnect the P24 telephone microphone assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G147-21(MIN+) - P24-2(MO1+) Always Below 1 Ω
      G147-22(MIN-) - P24-4(MO1-) Always Below 1 Ω
      G147-23(MACC) - P24-1(MAC1) Always Below 1 Ω
      G147-25(SNS) - P24-5(SNS1) Always Below 1 Ω
      G147-21(MIN+) or P24-2(MO1+) - Body ground Always 10 kΩ or higher
      G147-22(MIN-) or P24-4(MO1-) - Body ground Always 10 kΩ or higher
      G147-23(MACC) or P24-1(MAC1) - Body ground Always 10 kΩ or higher
      G147-25(SNS) or P24-5(SNS1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. INSPECT RADIO RECEIVER ASSEMBLY (MACC, MIN-) 
    1. With the G147 radio receiver assembly connector connected, disconnect the P24 telephone microphone assembly LH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P24-4(MO1-) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P24-1(MAC1) - Body ground IG ON 7.5 to 8.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  18

  18. INSPECT TELEPHONE MICROPHONE ASSEMBLY LH (OUTPUT TO RADIO RECEIVER ASSEMBLY) 
    1. Using an oscilloscope, measure the waveform according to the condition(s) in the table below.
      Item Condition
      Tester Connection P24-2(MO1+) - P24-4(MO1-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ON
      2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the microphone case LH sound holes.
      GTY1124208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Telephone microphone assembly LH)

      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.
      • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

      Result

      Result Proceed to
      A waveform synchronized with voice signals is output A
      A waveform synchronized with voice signals is not output B

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY LH. Refer to  REMOVAL [09/2022 - ] 

  19. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY RH) 
    1. Disconnect the G145 radio receiver assembly connector.
    2. Disconnect the P23 telephone microphone assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G145-17(MI2+) - P23-2(MO2+) Always Below 1 Ω
      G145-18(MI2-) - P23-4(MO2-) Always Below 1 Ω
      G145-20(MAC2) - P23-1(MAC2) Always Below 1 Ω
      G145-21(SNS2) - P23-5(SNS2) Always Below 1 Ω
      G145-17(MI2+) or P23-2(MO2+) - Body ground Always 10 kΩ or higher
      G145-18(MI2-) or P23-4(MO2-) - Body ground Always 10 kΩ or higher
      G145-20(MAC2) or P23-1(MAC2) - Body ground Always 10 kΩ or higher
      G145-21(SNS2) or P23-5(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  20

  20. INSPECT RADIO RECEIVER ASSEMBLY (MAC2, MI2-) 
    1. With the G145 radio receiver assembly connector connected, disconnect the P23 telephone microphone assembly RH connecter.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P23-4(MO2-) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      P23-1(MAC2) - Body ground IG ON 7.5 to 8.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  21

  21. INSPECT TELEPHONE MICROPHONE ASSEMBLY RH (OUTPUT TO RADIO RECEIVER ASSEMBLY) 
    1. Using an oscilloscope, measure the waveform according to the condition(s) in the table below.
      Item Condition
      Tester Connection P23-2(MO2+) - P23-4(MO2-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ON
      2. Sound is input to the telephone microphone assembly when the user is closer than 125 mm from the microphone case RH sound holes.
      GTY1128721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Telephone microphone assembly RH)

      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.
      • In order to ensure that a consistent sound level is input to the microphone, use a digital voice recorder, etc., to play back sound in the same location with respect to the microphone.

      Result

      Result Proceed to
      A waveform synchronized with voice signals is output A
      A waveform synchronized with voice signals is not output B

    Result: 

    A 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY RH. Refer to  REMOVAL [09/2022 - ] 

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