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DTC B1321-87: Lost Communication with EMV Missing Message [11/2023 - ]: Procedure

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

      Result

      Result Proceed to
      w/ Wireless Charging System A
      w/o Wireless Charging System B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Check each system for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Body Electrical > Navigation System > Trouble Codes 

    2. Confirm the DTC combinations of the following table.
      DTC Output Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly
      (Combination Meter)      		 Radio and Display Receiver Assembly
      (Navigation System)
      1 B1321-87 U11D0-87
      U11D3-87
      (Simultaneously output)
      2 B1321-87 U11D0-87
      3 B1321-87 U11D3-87
      4 B1321-87 Not output

      Result

      Result Proceed to
      DTC output pattern 1 A
      DTC output pattern 2 B
      DTC output pattern 3 C
      DTC output pattern 4 D

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2022 - ] 

    Result: 

    D 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    A 

    See step  3

  3. INSPECT EACH ECU (INTERNAL MALFUNCTION) 
    1. Remove 1 of the following ECUs.
    2. Measure the resistance of the removed ECU.
      NOTE:
      • Refer to the following table for the specified conditions of each ECU.
      • If the specified conditions are met, repeat the inspection procedure from step (a) for another ECU.

      HINT: 

      If the results of an ECU are not as specified, it is suspected that the ECU is the cause of the DTC.

      1. Inspect the radio and display receiver assembly.
        GTY1180305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio and Display Receiver Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        I253-11 (CNH1) - I253-12 (CNL1) Always 108 to 132 Ω
      2. Inspect the mobile wireless charger cradle assembly.
        GTY1180014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Mobile Wireless Charger Cradle Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        I213-5 (CANH) - I213-6 (CANL) Always 200 Ω or higher
      3. Inspect the combination meter assembly.
        GTY1179179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Combination Meter Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        I5-32 (TX+) - I5-15 (TX-) Always 108 to 132 Ω

        Result

        Result  Proceed to
        The results of all ECUs are as specified A
        The results of the radio and display receiver assembly is not as specified B
        The results of the mobile wireless charger cradle assembly is not as specified C
        The results of the combination meter assembly is not as specified D

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2022 - ] 

    Result: 

    C 

    REPLACE MOBILE WIRELESS CHARGER CRADLE ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    D 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  4. CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION CIRCUIT) 

    Pre-procedure1

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the I5 combination meter assembly connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I5-32 (TX+) - I5-15 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK FOR DTC 
    1. Check each system for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Body Electrical > Navigation System > Trouble Codes 

    2. Confirm the DTC combinations of the following table.
      DTC Output Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly
      (Combination Meter)      		 Radio and Display Receiver Assembly
      (Audio AND Visual System)
      1 B1321-87 U11D0-87
      2 B1321-87 Not output

      Result

      Result Proceed to
      DTC output pattern 1 A
      DTC output pattern 2 B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. INSPECT EACH ECU (INTERNAL MALFUNCTION) 
    1. Remove 1 of the following ECUs.
    2. Measure the resistance of the removed ECU.
      NOTE:
      • Refer to the following table for the specified conditions of each ECU.
      • If the specified conditions are met, repeat the inspection procedure from step (a) for another ECU.

      HINT: 

      If the results of an ECU are not as specified, it is suspected that the ECU is the cause of the DTC.

      1. Inspect the radio and display receiver assembly.
        GTY1110366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio and Display Receiver Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        I253-11 (CNH1) - I253-12 (CNL1) Always 108 to 132 Ω
      2. Inspect the combination meter assembly.
        GTY1121615Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Combination Meter Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        I5-32 (TX+) - I5-15 (TX-) Always 108 to 132 Ω

        Result

        Result  Proceed to
        The results of all ECUs are as specified A
        The results of the radio and display receiver assembly is not as specified B
        The results of the combination meter assembly is not as specified C

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2022 - ] 

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  7. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK FOR DTC 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      HINT: 

      By disconnecting the cable from the negative (-) auxiliary battery terminal, the internally stored information related to local bus communication for the combination meter assembly is reset.

    2. Disconnect the I253 radio and display receiver assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the ignition switch to ON.
    5. Wait 30 seconds or more.
    6. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      By resetting the internally stored information related to local bus communication, the detection conditions of DTC B1321-87 are not met as the combination meter assembly does not detect the radio and display receiver assembly. If the combination meter assembly is operating normally, DTC B1321-87 will not be stored.

      Result

      Result  Proceed to
      DTC B1321-87 is not output A
      DTC B1321-87 is output B

    Result: 

    A 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2022 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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