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Home >> Toyota >> 2022 >> Avalon XLE >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio / Video System - Diagnostic Codes & Symptom Tests (Except Hybrid) >> AUDIO AND VISUAL SYSTEM (for Gasoline Model) >> DTC B1579: Voice Recognition Microphone Disconnected [04/2018 - 08/2020] >> Procedure

DTC B1579: Voice Recognition Microphone Disconnected [04/2018 - 08/2020]: Procedure

  1. CHECK MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/ Sliding Roof A
      w/o Sliding Roof 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.
      GTY854554Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      G2-22 (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 [04/2018 -] 

    Result: 

    A 

    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
      G2-22 (MIN-) - O10-7 (MCO-) Always Below 1 Ω
      G2-25 (SNS2) or O10-6 (SNS2) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) or O10-7 (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) - 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
      G9-35 (MCI-) - O10-7 (MCO-) Always Below 1 Ω
      G9-35 (MCI-) or O10-7 (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 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
      G2-22 (MIN-) - G9-19 (MCO-) Always Below 1 Ω
      G2-22 (MIN-) or G9-19 (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 - 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  7

  7. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the G9 DCM (telematics transceiver) connector.
    2. Connect the G2 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY854148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G9-35 (MCI-) - 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: 

    OK 

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

    Result: 

    NG 

    See step  9

  9. 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
      B-1 - O10-6 (SNS2) Always Below 1 Ω
      B-2 - O10-7 (MCO-) Always Below 1 Ω
      B-1 or O10-6 (SNS2) - O10-15 (GND) Always 10 kΩ or higher
      B-2 or O10-7 (MCO-) - O10-15 (GND) Always 10 kΩ or higher
      GTY865017Courtesy 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 -] 

  10. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY854553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio and Display Receiver Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      G2-22 (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  12

    Result: 

    C 

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

    Result: 

    A 

    See step  11

  11. 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 O9 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) - O9-3 (SNS2) Always Below 1 Ω
      G2-22 (MIN-) - O9-4 (MCO-) Always Below 1 Ω
      G2-25 (SNS2) or O9-3 (SNS2) - Body ground Always 10 kΩ or higher
      G2-22 (MIN-) or O9-4 (MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  16

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY) 
    1. Disconnect the G9 DCM (telematics transceiver) connector.
    2. Disconnect the O9 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
      G9-35 (MCI-) - O9-4 (MCO-) Always Below 1 Ω
      G9-35 (MCI-) or O9-4 (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 - 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
      G2-22 (MIN-) - G9-19 (MCO-) Always Below 1 Ω
      G2-22 (MIN-) or G9-19 (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  14

  14. 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 O9 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) - O9-3 (SNS2) Always Below 1 Ω
      G2-25 (SNS2) or O9-3 (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  15

  15. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Connect the G9 DCM (telematics transceiver) connector.
    2. Connect the G2 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY854150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G9-35 (MCI-) - 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  16

  16. 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
      3 (SNS2) - 4 (MCO-) Always Below 1 Ω
      GTY756998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Roof Console Box Sub-assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  17

  17. 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
      B-1 - O9-3 (SNS2) Always Below 1 Ω
      B-2 - O9-4 (MCO-) Always Below 1 Ω
      B-1 or O9-3 (SNS2) - O9-11 (GND) Always 10 kΩ or higher
      B-2 or O9-4 (MCO-) - O9-11 (GND) Always 10 kΩ or higher
      GTY944844Courtesy 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 -] 

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