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DCM Data Signal Circuit between Navigation ECU and DCM [12/2019 - 10/2022]: Procedure

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

      Result

      Result Proceed to
      For 8 Inch Display A
      For 12.3 Inch Display B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the H11 DCM (telematics transceiver) connector.
    2. Disconnect the H3 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H11-31 (USBG) - H3-11 (USBG) Always Below 1 Ω
      H11-17 (VOT+) - H3-13 (VOR+) Always Below 1 Ω
      H11-15 (USBV) - H3-10 (USBV) Always Below 1 Ω
      H11-33 (VOT-) - H3-14 (VOR-) Always Below 1 Ω
      H11-34 (VOR-) - H3-16 (VOT-) Always Below 1 Ω
      H11-18 (VOR+) - H3-15 (VOT+) Always Below 1 Ω
      H11-31 (USBG) or H3-11 (USBG) - Body ground Always 10 kΩ or higher
      H11-17 (VOT+) or H3-13 (VOR+) - Body ground Always 10 kΩ or higher
      H11-15 (USBV) or H3-10 (USBV) - Body ground Always 10 kΩ or higher
      H11-33 (VOT-) or H3-14 (VOR-) - Body ground Always 10 kΩ or higher
      H11-34 (VOR-) or H3-16 (VOT-) - Body ground Always 10 kΩ or higher
      H11-18 (VOR+) or H3-15 (VOT+) - 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 (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the c5 navigation ECU connector.
      GTY842367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Navigation ECU)
      *b Front view of wire harness connector
      (to DCM (Telematics Transceiver))
      *A w/o Stereo Component Amplifier
      *B w/ Stereo Component Amplifier
    2. Disconnect the c2 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.
      Tester Connection Condition Specified Condition
      c5-1 (USB+) - c2-2 (USB+) Always Below 1 Ω
      c5-2 (USB-) - c2-1 (USB-) Always Below 1 Ω
      c5-3 (USBS) - c2-3 (USBS) Always Below 1 Ω
      c5-1 (USB+) or c2-2 (USB+) - Body ground Always 10 kΩ or higher
      c5-2 (USB-) or c2-1 (USB-) - Body ground Always 10 kΩ or higher
      c5-3 (USBS) or c2-3 (USBS) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022]  

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the H11 DCM (telematics transceiver) connector.
    2. Disconnect the H6 radio and display receiver assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H11-31 (USBG) - H6-11 (USBG) Always Below 1 Ω
      H11-17 (VOT+) - H6-13 (VOR+) Always Below 1 Ω
      H11-15 (USBV) - H6-10 (USBV) Always Below 1 Ω
      H11-33 (VOT-) - H6-14 (VOR-) Always Below 1 Ω
      H11-34 (VOR-) - H6-16 (VOT-) Always Below 1 Ω
      H11-18 (VOR+) - H6-15 (VOT+) Always Below 1 Ω
      H11-31 (USBG) or H6-11 (USBG) - Body ground Always 10 kΩ or higher
      H11-17 (VOT+) or H6-13 (VOR+) - Body ground Always 10 kΩ or higher
      H11-15 (USBV) or H6-10 (USBV) - Body ground Always 10 kΩ or higher
      H11-33 (VOT-) or H6-14 (VOR-) - Body ground Always 10 kΩ or higher
      H11-34 (VOR-) or H6-16 (VOT-) - Body ground Always 10 kΩ or higher
      H11-18 (VOR+) or H6-15 (VOT+) - 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 (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the c2 DCM (telematics transceiver) connector.
      GTY927101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to DCM (Telematics Transceiver))
      *b Front view of wire harness connector
      (to Navigation ECU)
    2. Disconnect the c4 navigation ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c2-1 (USB-) - c4-2 (USB-) Always Below 1 Ω
      c2-2 (USB+) - c4-1 (USB+) Always Below 1 Ω
      c2-3 (USBS) - c4-3 (USBS) Always Below 1 Ω
      c2-1 (USB-) or c4-2 (USB-) - Body ground Always 10 kΩ or higher
      c2-2 (USB+) or c4-1 (USB+) - Body ground Always 10 kΩ or higher
      c2-3 (USBS) or c4-3 (USBS) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022]  

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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