DTC B1321-87: Lost Communication with EMV Missing Message [12/2023 - ]: Procedure

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 for 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	U11D0-87
   Pattern 2	B1321-87	-

   Result

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

Result: 

B 

See step  4

Result: 

A 

See step  2

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 [12/2023 - ] 

Result: 

NG 

See step  3

Pre-procedure1

• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Disconnect the D179 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
  D179-11 (CNH1) - D179-12 (CNL1)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Ω
  D179-11 (CNH1) - D20-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Ω
  D179-12 (CNL1) - D20-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Ω
  D179-11 (CNH1) - D20-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	kΩ
  D179-12 (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 [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

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 [12/2023 - ] 

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2023 - ]