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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Navigation System (2019-Early 2023) - Diagnostic Codes (1 Of 2)) >> Navigation System >> DTC B1579: Voice Recognition Microphone Disconnected [09/2019 - 04/2020] >> Procedure

DTC B1579: Voice Recognition Microphone Disconnected [09/2019 - 04/2020]: 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 MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for Sedan Model A
      for Hatchback Model B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY854581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)

      Standard Resistance

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

      Result

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

    Result: 

    B 

    See step  4

    Result: 

    C 

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

    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
      I56-22 (MIN-) - T6-5 (MCO-) Always Below 1 Ω
      I56-25 (SNS2) or T6-4 (SNS2) - Body ground Always 10 kΩ or higher
      I56-22 (MIN-) or T6-5 (MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  8

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I72 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
      I72-35 (MCI-) - T6-5 (MCO-) Always Below 1 Ω
      I72-35 (MCI-) or T6-5 (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  5

  5. 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 I72 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I56-22 (MIN-) - I72-19 (MCO-) Always Below 1 Ω
      I56-22 (MIN-) or I72-19 (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  6

  6. 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  7

  7. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the I72 DCM (telematics transceiver) connector.
    2. Connect the I56 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY854141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      I72-35 (MCI-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

    Result: 

    OK 

    See step  8

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

      Refer to REMOVAL [01/2019 - 09/2022]

    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
      GTY889792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  9

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

      Refer to REMOVAL [01/2019 - 09/2022]

    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
      B-1 - T6-4 (SNS2) Always Below 1 Ω
      B-2 - T6-5 (MCO-) Always Below 1 Ω
      B-1 or T6-4 (SNS2) - T6-11 (GND) Always 10 kΩ or higher
      B-2 or T6-5 (MCO-) - T6-11 (GND) Always 10 kΩ or higher
      GTY924385Courtesy 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] 

    Result: 

    NG 

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

  10. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY854581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      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] 

    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
      I143-7 (MCI-) - T6-5 (MCO-) Always Below 1 Ω
      I143-7 (MCI-) or T6-5 (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  12

  12. 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
      I56-22 (MIN-) - I143-32 (MCO-) Always Below 1 Ω
      I56-22 (MIN-) or I143-32 (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  13

  13. 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  14

  14. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the I143 DCM (telematics transceiver) connector.
    2. Connect the I56 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY874753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      I143-7 (MCI-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [09/2019 - 04/2020] 

    Result: 

    OK 

    See step  15

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

      Refer to REMOVAL [01/2019 - 09/2022]

    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
      GTY889792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  16

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

      Refer to REMOVAL [01/2019 - 09/2022]

    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
      B-1 - T6-4 (SNS2) Always Below 1 Ω
      B-2 - T6-5 (MCO-) Always Below 1 Ω
      B-1 or T6-4 (SNS2) - T6-11 (GND) Always 10 kΩ or higher
      B-2 or T6-5 (MCO-) - T6-11 (GND) Always 10 kΩ or higher
      GTY924385Courtesy 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] 

    Result: 

    NG 

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

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