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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 3) >> Meter / Gauge System >> DTC B1321-87: Lost Communication with EMV Missing Message [11/2020 - 11/2021] >> Procedure

DTC B1321-87: Lost Communication with EMV Missing Message [11/2020 - 11/2021]: Procedure

  1. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Advanced Drive A
      w/o Advanced Drive B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Check if meter/gauge system DTCs are output.

      Body Electrical > Combination Meter > Trouble Codes 

    2. Check if audio and visual system DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

    3. Check the DTCs and output pattern according to the following table.
      Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly (Combination Meter) Radio Receiver Assembly (Navigation System)
      Pattern 1 B1321-87 B1324
      Pattern 2 B1321-87 -

      Result

      Result Proceed to
      Pattern 1 is output A
      Pattern 2 is output B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D43 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D43-32 (TX+) - D43-15 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D43-32 (TX+) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D43-15 (TX-) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D43-32 (TX+) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D43-15 (TX-) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    See step  4

  4. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D64 radio receiver assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D64-5 (CNH1) - D64-6 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D64-5 (CNH1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-6 (CNL1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-5 (CNH1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D64-6 (CNL1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

  5. CHECK RADIO RECEIVER ASSEMBLY 

    Pre-procedure1

    • Disconnect the D43 combination meter assembly connector.
    • Using an oscilloscope, check the waveform.

      OK

      Tester Connection Switch Condition Tool Setting Specified Condition
      D43-32 (TX+) - D43-15 (TX-) Ignition switch ON 1 V/DIV., 100 μs./DIV. Pulse generation

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

  6. CHECK VEHICLE TYPE 
    1. Check vehicle condition.

      Result

      Result  Proceed to 
      w/ Navigation System with Meter Mirror Sub-assembly A
      w/ Navigation System without Meter Mirror Sub-assembly B
      w/o Navigation System C

    Result: 

    B 

    See step  12

    Result: 

    C 

    See step  16

    Result: 

    A 

    See step  7

  7. CHECK FOR DTC 
    1. Check if meter/gauge system DTCs are output.

      Body Electrical > Combination Meter > Trouble Codes 

    2. Check if audio and visual system DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

    3. Check if headup display system DTCs are output.

      Body Electrical > Head Up Display > Trouble Codes 

    4. Check the DTCs and output pattern according to the following table.
      Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly (Combination Meter) Radio Receiver Assembly (Navigation System) Meter Mirror Sub-assembly (Head Up Display)
      Pattern 1 B1321-87 B1324 B1325 B1321-87
      Pattern 2 B1321-87 B1324 - -
      Pattern 3 B1321-87 - - B1321-87
      Pattern 4 B1321-87 - - -

      Result

      Result Proceed to
      Pattern 1 is output A
      Pattern 2 is output B
      Pattern 3 is output C
      Pattern 4 is output D

    Result: 

    B 

    See step  11

    Result: 

    C 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

    Result: 

    D 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    A 

    See step  8

  8. CHECK METER MIRROR SUB-ASSEMBLY 

    Pre-procedure1

    • Disconnect the D95 meter mirror sub-assembly connector.
    • Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

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

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE METER MIRROR SUB-ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    A 

    See step  9

  9. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D41 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D41-8 (TX+) - D41-7 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D41-8 (TX+) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-7 (TX-) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-8 (TX+) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D41-7 (TX-) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    See step  10

  10. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D64 radio receiver assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D64-5 (CNH1) - D64-6 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D64-5 (CNH1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-6 (CNL1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-5 (CNH1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D64-6 (CNL1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

  11. CHECK COMBINATION METER ASSEMBLY 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D41 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D41-8 (TX+) - D41-7 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

  12. CHECK FOR DTC 
    1. Check if meter/gauge system DTCs are output.

      Body Electrical > Combination Meter > Trouble Codes 

    2. Check if audio and visual system DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

    3. Check the DTCs and output pattern according to the following table.
      Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly (Combination Meter) Radio Receiver Assembly (Navigation System)
      Pattern 1 B1321-87 B1324
      Pattern 2 B1321-87 -

      Result

      Result Proceed to
      Pattern 1 is output A
      Pattern 2 is output B

    Result: 

    B 

    See step  15

    Result: 

    A 

    See step  13

  13. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D41 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D41-8 (TX+) - D41-7 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D41-8 (TX+) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-7 (TX-) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-8 (TX+) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D41-7 (TX-) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    See step  14

  14. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D64 radio receiver assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D64-5 (CNH1) - D64-6 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D64-5 (CNH1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-6 (CNL1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D64-5 (CNH1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D64-6 (CNL1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

  15. CHECK RADIO RECEIVER ASSEMBLY 

    Pre-procedure1

    • Disconnect the D41 combination meter assembly connector.
    • Using an oscilloscope, check the waveform.

      OK

      Tester Connection Switch Condition Tool Setting Specified Condition
      D41-8 (TX+) - D41-7 (TX-) Ignition switch ON 1 V/DIV., 100 μs./DIV. Pulse generation

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

  16. CHECK FOR DTC 
    1. Check if meter/gauge system DTCs are output.

      Body Electrical > Combination Meter > Trouble Codes 

    2. Check if audio and visual system DTCs are output.

      Body Electrical > Navigation System > Trouble Codes 

    3. Check the DTCs and output pattern according to the following table.
      Pattern DTC Output Part Name
      (Display on GTS)
      Combination Meter Assembly (Combination Meter) Radio and Display Receiver Assembly (Navigation System)
      Pattern 1 B1321-87 B1324
      Pattern 2 B1321-87 -

      Result

      Result Proceed to
      Pattern 1 is output A
      Pattern 2 is output B

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  17

  17. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D41 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D41-8 (TX+) - D41-7 (TX-) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D41-8 (TX+) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-7 (TX-) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D41-8 (TX+) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D41-7 (TX-) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    See step  18

  18. CHECK CAN WIRE 

    Pre-procedure1

    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Disconnect the D56 radio and display receiver assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D56-5 (CNH1) - D56-6 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Ω
      D56-5 (CNH1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D56-6 (CNL1) - D20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Ω
      D56-5 (CNH1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ
      D56-6 (CNL1) - D20-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

  19. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY 

    Pre-procedure1

    • Disconnect the D41 combination meter assembly connector.
    • Using an oscilloscope, check the waveform.

      OK

      Tester Connection Switch Condition Tool Setting Specified Condition
      D41-8 (TX+) - D41-7 (TX-) Ignition switch ON 1 V/DIV., 100 μs./DIV. Pulse generation

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021] 

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2020 - 12/2022] 

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