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Home >> Toyota >> 2021 >> Venza XLE >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System (Except 12.3 Inch Display) - Diagnostic Codes & Symptom Tests >> METER / GAUGE SYSTEM (except 12.3 Inch Display) >> DTC B1321-87: Lost Communication with EMV Missing Message [07/2020 - 10/2022] >> Procedure

DTC B1321-87: Lost Communication with EMV Missing Message [07/2020 - 10/2022]: Procedure

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

      Result

      Result Proceed to
      w/ Headup Display System A
      w/o Headup Display System B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC (EACH SYSTEM) 
    1. Check each system for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Body Electrical > Navigation System > Trouble Codes 

      Body Electrical > Head Up Display > 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 Receiver Assembly*1
      Radio and Display Receiver Assembly*2
      (Navigation System)      		 Meter Mirror Sub-assembly
      (Headup Display)
      1 B1321-87 B1324
      B1325      		 B1321-87
      2 B1321-87 B1324 Not output
      3 B1321-87 Not output B1321-87
      4 B1321-87 Not output Not output
      1. *1: w/ Navigation System
      2. *2: w/o Navigation System

      Result

      Result Proceed to
      DTC output pattern 1 A
      DTC output pattern 2 B
      DTC output pattern 3
      (w/ Navigation System)      		 C
      DTC output pattern 3
      (w/o Navigation System)      		 D
      DTC output pattern 4 E

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    D 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    E 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    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 receiver assembly (w/ Navigation System).
        GTY987069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio Receiver Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        E3-5 (CNH1) - E3-6 (CNL1) Always 108 to 132 Ω
      2. Inspect the radio and display receiver assembly (w/o Navigation System).

        Standard Resistance

        Tester Connection Condition Specified Condition
        E4-5 (CNH1) - E4-6 (CNL1) Always 108 to 132 Ω
        GTY987070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio and Display Receiver Assembly)
      3. Inspect the meter mirror sub-assembly.
        GTY985905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Meter Mirror Sub-assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        E35-14 (TX+) - E35-15 (TX-) Always 200 Ω or higher
      4. Inspect the combination meter assembly.
        GTY985925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Combination Meter Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        E17-36 (MSCH) - E17-37 (MSCL) Always 108 to 132 Ω

      Result

      Result  Proceed to
      The results of all ECUs are as specified A
      The results of the radio receiver assembly are not as specified
      (w/ Navigation System)      		 B
      The results of the radio and display receiver assembly are not as specified
      (w/o Navigation System)      		 C
      The results of the meter mirror sub-assembly are not as specified D
      The results of the combination meter assembly are not as specified E

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    C 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    D 

    REPLACE METER MIRROR SUB-ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    E 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

  4. CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION CIRCUIT) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the E17 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E17-36 (MSCH) -E17-37 (MSCL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK FOR DTC (EACH SYSTEM) 
    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 Receiver Assembly*1
      Radio and Display Receiver Assembly*2
      (Navigation System)
      1 B1321-87 B1324
      2 B1321-87 Not output
      1. *1: w/ Navigation System
      2. *2: w/o Navigation System

      Result

      Result  Proceed to
      DTC output pattern 1 A
      DTC output pattern 2
      (w/ Navigation System)      		 B
      DTC output pattern 2
      (w/o Navigation System)      		 C

    Result: 

    B 

    See step  7

    Result: 

    C 

    See step  8

    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 receiver assembly (w/ Navigation System).
        GTY987069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio Receiver Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        E3-5 (CNH1) - E3-6 (CNL1) Always 108 to 132 Ω
      2. Inspect the radio and display receiver assembly (w/o Navigation System).

        Standard Resistance

        Tester Connection Condition Specified Condition
        E4-5 (CNH1) - E4-6 (CNL1) Always 108 to 132 Ω
        GTY987070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Radio and Display Receiver Assembly)
      3. Inspect the combination meter assembly.
        GTY985925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component without harness connected
        (Combination Meter Assembly)

        Standard Resistance

        Tester Connection Condition Specified Condition
        E17-36 (MSCH) - E17-37 (MSCL) Always 108 to 132 Ω

      Result

      Result  Proceed to
      The results of all ECUs are as specified A
      The results of the radio receiver assembly are not as specified
      (w/ Navigation System)      		 B
      The results of the radio and display receiver assembly are not as specified
      (w/o Navigation System)      		 C
      The results of the combination meter assembly are not as specified D

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    B 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    C 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    D 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

  7. CHECK FOR DTC (METER / GAUGE SYSTEM) 
    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 E3 radio receiver assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the ignition switch to ON.
    5. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

    6. Wait 30 seconds or more.
    7. 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 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 RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

  8. CHECK FOR DTC (METER / GAUGE SYSTEM) 
    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 E4 radio and display receiver assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the ignition switch to ON.
    5. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

    6. Wait 30 seconds or more.
    7. 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 [07/2020 - 10/2022] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2020 - 10/2022] 

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