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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 66 (Navigation System - Symptom Tests (Hybrid)) >> NAVIGATION SYSTEM (for HV Model) >> Circuit Tests >> Microphone Circuit [04/2018 - 08/2020] >> Procedure

Microphone Circuit [04/2018 - 08/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.
  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 [04/2018 - 08/2020]

      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 [04/2018 - 08/2020] 

    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 [04/2018 - 08/2020]

      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: 

    NG 

    See step  13

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the O10 roof console box sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G2-25 (SNS2) - O10-6 (SNS2) Always Below 1 Ω
      G2-25 (SNS2) or O10-6 (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 AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the G9 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G2-21 (MIN+) - G9-18 (MCO+) Always Below 1 Ω
      G2-22 (MIN-) - G9-19 (MCO-) Always Below 1 Ω
      G2-21 (MIN+) or G9-18 (MCO+) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) or G9-19 (MCO-) - Body ground Always 10 kΩ or higher
      G2-24 (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) - ROOF CONSOLE BOX SUB-ASSEMBLY) 
    1. Disconnect the G9 DCM (telematics transceiver) connector.
    2. Disconnect the O10 roof console box sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G9-33 (MCVD) - O10-9 (MACC) Always Below 1 Ω
      G9-34 (MCI+) - O10-8 (MCO+) Always Below 1 Ω
      G9-35 (MCI-) - O10-7 (MCO-) Always Below 1 Ω
      G9-33 (MCVD) or O10-9 (MACC) - Body ground Always 10 kΩ or higher
      G9-34 (MCI+) or O10-8 (MCO+) - Body ground Always 10 kΩ or higher
      G9-35 (MCI-) or O10-7 (MCO-) - Body ground Always 10 kΩ or higher
      G9-32 (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. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Disconnect the G9 DCM (telematics transceiver) connector.
    2. Connect the G2 radio and display receiver assembly connector.
      GTY854549Courtesy 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
      G2-24 (SGND) - Body ground Always Below 1 Ω
      G2-22 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  7

  7. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the G9 DCM (telematics transceiver) connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY869110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Voltage

      Tester Connection Condition Specified Condition
      G9-33 (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
      G9-35 (MCI-) - Body ground Always Below 1 Ω
      G9-32 (SGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [04/2018 - 08/2020] 

    Result: 

    OK 

    See step  8

  8. INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY 
    1. Remove the roof console box sub-assembly.

      Refer to REMOVAL [04/2018 - ]

    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
      6 (SNS2) - 7 (MCO-) Always Below 1 Ω
      GTY753732Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Roof Console Box Sub-assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  9

  9. INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER)) 
    1. Connect the G2 radio and display receiver assembly connector.
    2. Connect the O10 roof console box sub-assembly connector.
    3. Connect the G9 DCM (telematics transceiver) connector.
    4. Turn the power switch on (ACC).
    5. Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the O10 roof console box sub-assembly connector.
      GTY849536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Roof Console Box Sub-assembly)
    6. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Measurement terminal O10-8 (MCO+) - O10-7 (MCO-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the power switch on (ACC).
      2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-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  11

    Result: 

    OK 

    See step  10

  10. INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Connect the G2 radio and display receiver assembly connector.
    2. Connect the O10 roof console box sub-assembly connector.
    3. Connect the G9 DCM (telematics transceiver) connector.
    4. Turn the power switch on (ACC).
    5. Connect an oscilloscope to terminals 18 (MCO+) and 19 (MCO-) of the G9 DCM (telematics transceiver) connector.
      GTY841989Courtesy 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 G9-18 (MCO+) - G9-19 (MCO-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the power switch on (ACC).
      2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-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 [04/2018 - 08/2020] 

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [04/2018 - 08/2020] 

  11. INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY 
    1. Remove the roof console box sub-assembly.

      Refer to REMOVAL [04/2018 - ]

    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
      O10-8 (MCO+) - B-3 Always Below 1 Ω
      O10-7 (MCO-) - B-2 Always Below 1 Ω
      O10-8 (MCO+) or B-3 - O10-15 (GND) Always 10 kΩ or higher
      O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher
      GTY865004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Roof Console Box Sub-assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    NG 

    REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

  12. INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY 
    1. Remove the roof console box sub-assembly.

      Refer to REMOVAL [04/2018 - ]

    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
      O10-6 (SNS2) - B-1 Always Below 1 Ω
      O10-7 (MCO-) - B-2 Always Below 1 Ω
      O10-6 (SNS2) or B-1 - O10-15 (GND) Always 10 kΩ or higher
      O10-7 (MCO-) or B-2 - O10-15 (GND) Always 10 kΩ or higher
      GTY932088Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Roof Console Box Sub-assembly (No. 1 Roof Wire Side))
      *b Component without harness connected
      (Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    NG 

    REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

  13. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) 
    1. Disconnect the G1 radio and display receiver assembly connector.
    2. Disconnect the G13 navigation ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-25 (MCO+) - G13-13 (MIC+) Always Below 1 Ω
      G1-26 (MCO-) - G13-14 (MIC-) Always Below 1 Ω
      G1-25 (MCO+) or G13-13 (MIC+) - Body ground Always 10 kΩ or higher
      G1-26 (MCO-) or G13-14 (MIC-) - Body ground Always 10 kΩ or higher
      G1-24 (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  14

  14. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT TO NAVIGATION ECU) 
    1. Disconnect the G13 navigation ECU connector.
    2. Turn the power switch on (ACC).
    3. Check the signal waveform according to the condition(s) in the table below.
      GTY839701Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Navigation ECU)
      Item Condition
      Measurement terminal G13-13 (MIC+) - G13-14 (MIC-)
      Tool setting 50 mV/DIV., 500 ms/DIV.
      Vehicle condition
      1. Turn the power switch on (ACC).
      2. Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-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 [04/2018 - 08/2020] 

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

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