LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2023 >> RAV4 XLE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Navigation System - Diagnostic Codes (1 Of 2)) >> Navigation System >> DTC B1579: Voice Recognition Microphone Disconnected [10/2019 - 01/2020] >> Procedure

DTC B1579: Voice Recognition Microphone Disconnected [10/2019 - 01/2020]: Procedure

WARNING: This page is about a different car, the 2022 Toyota RAV4, 2021 Toyota RAV4, 2020 Toyota RAV4, and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE TYPE 
    1. Check the vehicle type.

      Result

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

    Result: 

    B 

    See step  5

    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*1 or P14*2 map light assembly connector.
      1. *1: for TMC Made
      2. *2: for TMMC Made
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR TMC MADE

      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
      FOR TMMC MADE

      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  3

  3. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY) 
    1. Disconnect the G131 DCM (telematics transceiver) connector.
    2. Disconnect the P20*1 or P14*2 map light assembly connector.
      1. *1: for TMC Made
      2. *2: for TMMC Made
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR TMC MADE

      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
      FOR TMMC MADE

      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  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  6

    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 P20*1 or P14*2 map light assembly connector.
      1. *1: for TMC Made
      2. *2: for TMMC Made
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR TMC MADE

      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
      FOR TMMC MADE

      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  6

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

      Refer to REMOVAL [11/2018 - ]

      GTY861367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMC Made
      *B for TMMC Made
      *a Component without harness connected
      (Map Light Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR TMC MADE

      Tester Connection Condition Specified Condition
      6 (SNS2) - 7 (MCO-) Always Below 1 Ω
      FOR TMMC MADE

      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  7

  7. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly.
      GTY875142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMC Made
      *B for TMMC Made
      *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

      FOR TMC MADE

      Tester Connection Condition Specified Condition
      6 (SNS2) - C-1 (SNS2) Always Below 1 Ω
      7 (MCO-) - C-2 (MIC-) Always Below 1 Ω
      FOR TMMC MADE

      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] 

    Result: 

    NG 

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

scientia non olet · About LEMON Manuals