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DTC B1579: Voice Recognition Microphone Disconnected [01/2020 - 10/2022]: Procedure

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  1. CHECK VEHICLE TYPE 
    1. Check the vehicle type.

      Result

      Result Proceed to
      for TMC Made and w/ Manual (SOS) Switch A
      for TMMC Made and w/ Manual (SOS) Switch B
      for TMC Made and w/o Manual (SOS) Switch C
      for TMMC Made and w/o Manual (SOS) Switch D

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  8

    Result: 

    D 

    See step  11

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the P20 map light 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) - P20-6 (SNS2) Always Below 1 Ω
      G2-25 (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  3

  3. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G131 DCM (telematics transceiver) connector.
    2. Disconnect the P20 telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G131-7 (MCI-) - P20-7 (MCO-) Always Below 1 Ω
      G131-7 (MCI-) - 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 DCM (TELEMATICS TRANSCEIVER) (MCI-) 
    1. Remove the DCM (telematics transceiver) with the connector(s) still connected.
      GTY942848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM [Telematics Transceiver])

      Refer to REMOVAL [10/2019 - 10/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G131-7 (MCI-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [10/2019 - 10/2022] 

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the P14 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G2-25 (SNS2) - P14-4 (SNS2) Always Below 1 Ω
      G2-25 (SNS2) - Body ground Always 10 kΩ or higher
      W/O PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G2-25 (SNS2) - P14-5 (SNS2) Always Below 1 Ω
      G2-25 (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  6

  6. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G131 DCM (telematics transceiver) connector.
    2. Disconnect the P14 telephone microphone assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G131-7 (MCI-) - P14-5 (MCO-) Always Below 1 Ω
      G131-7 (MCI-) - Body ground Always 10 kΩ or higher
      W/O PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G131-7 (MCI-) - P14-6 (MCO-) Always Below 1 Ω
      G131-7 (MCI-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK DCM (TELEMATICS TRANSCEIVER) (MCI-) 
    1. Remove the DCM (telematics transceiver) with the connector(s) still connected.
      GTY942848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM [Telematics Transceiver])

      Refer to REMOVAL [10/2019 - 10/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G131-7 (MCI-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  12

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [10/2019 - 10/2022] 

  8. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the P20 map light 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) - P20-6 (SNS2) Always Below 1 Ω
      G2-22 (MIN-) - P20-7 (MCO-) Always Below 1 Ω
      G2-25 (SNS2) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

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

      Refer to REMOVAL [11/2018 - ]

      GTY874644Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly)
    2. 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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022] 

    Result: 

    NG 

    See step  10

  10. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.
      GTY937935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly [Wire Harness Side])
      *b Component without harness connected
      (Map Light Assembly [Telephone Microphone Assembly Side])

      Refer to REMOVAL [11/2018 - ]

    2. Disconnect the 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) - C-1 (SNS2) Always Below 1 Ω
      7 (MCO-) - C-2 (MIC-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [11/2018 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

  11. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the G2 radio and display receiver assembly connector.
    2. Disconnect the P14 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G2-25 (SNS2) - P14-4 (SNS2) Always Below 1 Ω
      G2-22 (MIN-) - P14-5 (MCO-) Always Below 1 Ω
      G2-25 (SNS2) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) - Body ground Always 10 kΩ or higher
      W/O PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      G2-25 (SNS2) - P14-5 (SNS2) Always Below 1 Ω
      G2-22 (MIN-) - P14-6 (MCO-) Always Below 1 Ω
      G2-25 (SNS2) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) - 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 MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.

      Refer to REMOVAL [11/2018 - ]

      GTY889821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Panoramic Moon Roof System
      *B w/o Panoramic Moon Roof System
      *a Component without harness connected
      (Map Light Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      4 (SNS2) - 5 (MCO-) Always Below 1 Ω
      W/O PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      5 (SNS2) - 6 (MCO-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022] 

    Result: 

    NG 

    See step  13

  13. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.
      GTY924428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Panoramic Moon Roof System
      *B w/o Panoramic Moon Roof System
      *a Component without harness connected
      (Map Light Assembly [Wire Harness Side])
      *b Component without harness connected
      (Map Light Assembly [Telephone Microphone Assembly Side])

      Refer to REMOVAL [11/2018 - ]

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

      Standard Resistance

      W/ PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      4 (SNS2) - C-1 (SNS2) Always Below 1 Ω
      5 (MCO-) - C-2 (MIC-) Always Below 1 Ω
      W/O PANORAMIC MOON ROOF SYSTEM

      Tester Connection Condition Specified Condition
      5 (SNS2) - C-1 (SNS2) Always Below 1 Ω
      6 (MCO-) - C-2 (MIC-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [11/2018 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022] 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

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