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Microphone Circuit [04/2020 - 11/2022]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 Toyota GR Corolla, 2023 Toyota Corolla, 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO NAVIGATION ECU) 
    1. Enter the "Microphone Check" screen. Refer to Check Microphone (Input to navigation ECU) in Operation Check.

      Refer to OPERATION CHECK [04/2020 - 11/2022]

      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 [04/2020 - 09/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022] 

    Result: 

    NG 

    See step  2

  2. CHECK MICROPHONE AND VOICE RECOGNITION (INPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Enter the "Microphone Check" screen. Refer to Check Microphone (Input to radio and display receiver assembly) in Operation Check.

      Refer to OPERATION CHECK [04/2020 - 11/2022]

      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

      Result Proceed to
      NG (w/o Manual (SOS) Switch) A
      NG (w/ Manual (SOS) Switch) B
      OK C

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  19

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I56 radio and display receiver assembly connector.
    2. Disconnect the T6 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I56-25 (SNS2) - T6-4 (SNS2) Always Below 1 Ω
      I56-23 (MACC) - T6-7 (MACC) Always Below 1 Ω
      I56-21 (MIN+) - T6-6 (MCO+) Always Below 1 Ω
      I56-22 (MIN-) - T6-5 (MCO-) Always Below 1 Ω
      I56-25 (SNS2) or T6-4 (SNS2) - Body ground Always 10 kΩ or higher
      I56-23 (MACC) or T6-7 (MACC) - Body ground Always 10 kΩ or higher
      I56-21 (MIN+) or T6-6 (MCO+) - Body ground Always 10 kΩ or higher
      I56-22 (MIN-) or T6-5 (MCO-) - Body ground Always 10 kΩ or higher
      I56-24 (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  4

  4. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Connect the I56 radio and display receiver assembly connector.
    2. Connect the T6 map light assembly connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY854568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      I56-23 (MACC) - Body ground Ignition switch to 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
      I56-24 (SGND) - Body ground Always Below 1 Ω
      I56-22 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    OK 

    See step  5

  5. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Connect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (SNS2) - 5 (MCO-) Always Below 1 Ω
      GTY889794Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  6

  6. INSPECT MAP LIGHT ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Connect the I56 radio and display receiver assembly connector.
    2. Connect the T6 map light assembly connector.
    3. Turn the ignition switch to ACC.
    4. Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the T6 map light assembly connector.
      GTY926942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Map Light Assembly)
    5. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Measurement terminal T6-6 (MCO+) - T6-5 (MCO-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ACC.
      2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light assembly sound holes.

      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 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022] 

    Result: 

    NG 

    See step  7

  7. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Disconnect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      T6-6 (MCO+) - B-3 Always Below 1 Ω
      T6-5 (MCO-) - B-2 Always Below 1 Ω
      T6-6 (MCO+) or B-3 - T6-11 (GND) Always 10 kΩ or higher
      T6-5 (MCO-) or B-2 - T6-11 (GND) Always 10 kΩ or higher
      GTY924408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Map Light Assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

  8. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Disconnect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      T6-4 (SNS2) - B-1 Always Below 1 Ω
      T6-5 (MCO-) - B-2 Always Below 1 Ω
      T6-4 (SNS2) or B-1 - T6-11 (GND) Always 10 kΩ or higher
      T6-5 (MCO-) or B-2 - T6-11 (GND) Always 10 kΩ or higher
      GTY924410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Map Light Assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

  9. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I56 radio and display receiver assembly connector.
    2. Disconnect the T6 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I56-25 (SNS2) - T6-4 (SNS2) Always Below 1 Ω
      I56-25 (SNS2) or T6-4 (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  10

  10. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the I56 radio and display receiver assembly connector.
    2. Disconnect the I143 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I56-21 (MIN+) - I143-16 (MCO+) Always Below 1 Ω
      I56-22 (MIN-) - I143-32 (MCO-) Always Below 1 Ω
      I56-21 (MIN+) or I143-16 (MCO+) - Body ground Always 10 kΩ or higher
      I56-22 (MIN-) or I143-32 (MCO-) - Body ground Always 10 kΩ or higher
      I56-24 (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  11

  11. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I143 DCM (telematics transceiver) connector.
    2. Disconnect the T6 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I143-5 (MCVD) - T6-7 (MACC) Always Below 1 Ω
      I143-6 (MCI+) - T6-6 (MCO+) Always Below 1 Ω
      I143-7 (MCI-) - T6-5 (MCO-) Always Below 1 Ω
      I143-5 (MCVD) or T6-7 (MACC) - Body ground Always 10 kΩ or higher
      I143-6 (MCI+) or T6-6 (MCO+) - Body ground Always 10 kΩ or higher
      I143-7 (MCI-) or T6-5 (MCO-) - Body ground Always 10 kΩ or higher
      I143-23 (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  12

  12. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Disconnect the I143 DCM (telematics transceiver) connector.
    2. Connect the I56 radio and display receiver assembly connector.
      GTY929800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I56-24 (SGND) - Body ground Always Below 1 Ω
      I56-22 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    OK 

    See step  13

  13. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the I143 DCM (telematics transceiver) connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY874755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Voltage

      Tester Connection Condition Specified Condition
      I143-5 (MCVD) - Body ground Ignition switch to 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
      I143-7 (MCI-) - Body ground Always Below 1 Ω
      I143-23 (SGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    OK 

    See step  14

  14. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Connect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4 (SNS2) - 5 (MCO-) Always Below 1 Ω
      GTY937541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  15

  15. INSPECT MAP LIGHT ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)) 
    1. Connect the I56 radio and display receiver assembly connector.
    2. Connect the T6 map light assembly connector.
    3. Connect the I143 DCM (telematics transceiver) connector.
    4. Turn the ignition switch to ACC.
    5. Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the T6 map light assembly connector.
      GTY841659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Map Light Assembly)
    6. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Measurement terminal T6-6 (MCO+) - T6-5 (MCO-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ACC.
      2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light assembly sound holes.

      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 

    See step  17

    Result: 

    OK 

    See step  16

  16. INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Connect the I56 radio and display receiver assembly connector.
    2. Connect the T6 map light assembly connector.
    3. Connect the I143 DCM (telematics transceiver) connector.
    4. Turn the ignition switch to ACC.
    5. Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the I143 DCM (telematics transceiver) connector.
      GTY929473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      DCM (Telematics Transceiver)
    6. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Measurement terminal I143-16 (MCO+) - I143-32 (MCO-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ACC.
      2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light assembly sound holes.

      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 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

  17. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Disconnect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      T6-6 (MCO+) - B-3 Always Below 1 Ω
      T6-5 (MCO-) - B-2 Always Below 1 Ω
      T6-6 (MCO+) or B-3 - T6-11 (GND) Always 10 kΩ or higher
      T6-5 (MCO-) or B-2 - T6-11 (GND) Always 10 kΩ or higher
      GTY924384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Map Light Assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

  18. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [01/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022]

    2. Disconnect the B telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      T6-4 (SNS2) - B-1 Always Below 1 Ω
      T6-5 (MCO-) - B-2 Always Below 1 Ω
      T6-4 (SNS2) or B-1 - T6-11 (GND) Always 10 kΩ or higher
      T6-5 (MCO-) or B-2 - T6-11 (GND) Always 10 kΩ or higher
      GTY945203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Map Light Assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [01/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

  19. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) 
    1. Disconnect the I57 radio and display receiver assembly connector.
    2. Disconnect the I69 navigation ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I57-25 (MCO+) - I69-13 (MIC+) Always Below 1 Ω
      I57-26 (MCO-) - I69-14 (MIC-) Always Below 1 Ω
      I57-25 (MCO+) or I69-13 (MIC+) - Body ground Always 10 kΩ or higher
      I57-26 (MCO-) or I69-14 (MIC-) - Body ground Always 10 kΩ or higher
      I57-24 (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  20

  20. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT TO NAVIGATION ECU) 
    1. Disconnect the I69 navigation ECU connector.
    2. Turn the ignition switch to ACC.
    3. Check the signal waveform according to the condition(s) in the table below.
      GTY839698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Navigation ECU)
      Item Condition
      Measurement terminal I69-13 (MIC+) - I69-14 (MIC-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the ignition switch to ACC.
      2. Sound is input to the map light assembly when the user is closer than 125 mm from the map light assembly sound holes.

      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 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022] 

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2019 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022] 

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