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DTC B15DB: Telematics Transceiver Disconnected [12/2019 - 10/2022]: Procedure

  1. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) POWER SOURCE) 
    1. Disconnect the H11 DCM (telematics transceiver) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H11-20 (E) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H11-1 (+B) - H11-20 (E)*1 Ignition switch off 11 to 14 V
      H11-1 (+B) - H11-20 (E)*2 Always 11 to 14 V*3
      10.5 to 16 V*4
      H11-19 (IG2) - H11-20 (E) Ignition switch ON 11 to 14 V*3
      10.5 to 16 V*4
      1. *1: for HV Model
      2. *2: for Gasoline Model
      3. *3: w/o Stop and Start System
      4. *4: w/ Stop and Start System

      Result

      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System) C

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    C 

    GO TO STOP AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] 

    Result: 

    A 

    See step  2

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Disconnect the H3 radio and display receiver assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY934675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Radio and Display Receiver Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      H3-11 (USBG) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H3-10 (USBV) - H3-11 (USBG) Ignition switch ACC 4.75 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  3

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H3-10 (USBV) - H11-15 (USBV) Always Below 1 Ω
      H3-11 (USBG) - H11-31 (USBG) Always Below 1 Ω
      H3-10 (USBV) or H11-15 (USBV) - Body ground Always 10 kΩ or higher
      H3-11 (USBG) or H11-31 (USBG) - 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 HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - RADIO AND DISPLAY RECEIVER ASSEMBLY) 
    1. Check the installation condition.
      1. Check the USB communication lines between the radio and display receiver assembly and DCM (telematics transceiver) for any installation or connection problems.
    2. Disconnect the c2 DCM (telematics transceiver) connector.
    3. Disconnect the c1 radio and display receiver assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c2-2 (USB+) - c1-1 (US4+) Always Below 1 Ω
      c2-1 (USB-) - c1-2 (US4-) Always Below 1 Ω
      c2-3 (USBS) - c1-3 (UGD4) Always Below 1 Ω
      c2-2 (USB+) or c1-1 (US4+) - Body ground Always 10 kΩ or higher
      c2-1 (USB-) or c1-2 (US4-) - Body ground Always 10 kΩ or higher
      c2-3 (USBS) or c1-3 (UGD4) - Body ground Always 10 kΩ or higher
      GTY882044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to DCM (Telematics Transceiver))
      *b Front view of wire harness connector
      (to Radio and Display Receiver Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK DCM (TELEMATICS TRANSCEIVER) 
    1. Replace the DCM (telematics transceiver) with a new or known good one.

      Refer to REMOVAL [12/2019 - 10/2022]

    2. Clear the DTCs.

      Body Electrical > Navigation System > Clear DTCs 

    3. Turn the ignition switch off.
    4. Turn the ignition switch to ON and wait for 90 seconds.
    5. Recheck for DTCs and check that no DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

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