DTC B1321-87: Lost Communication with EMV Missing Message [02/2024 - ]: Procedure

1. Check if meter/gauge system DTCs are output.

   Body Electrical > Combination Meter > Trouble Codes 

2. Check if navigation system DTCs are output.

   Body Electrical > Navigation System > Trouble Codes 

3. Check for DTCs and the output pattern according to the following table.

   Pattern	DTC Output Part Name
   	Combination Meter Assembly	Radio and Display Receiver Assembly
   	B1321-87	U11D0-87
   Pattern 1	◦	◦
   Pattern 2	◦	-

   ◦: DTC is output.-: DTC is not output

   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

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the E7 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
   E7-15 (TX+) - E7-31 (TX-)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω
   E7-15 (TX+) - E102-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   E7-31 (TX-) - E102-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   E7-15 (TX+) - E102-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   E7-31 (TX-) - E102-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

See step  3

Pre-procedure1

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the E15 radio and display receiver assembly connector.
3. Disconnect the E7 combination meter assembly connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E7-15 (TX+) - E15-11 (CNH1)	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   E7-15 (TX+) - E15-9 (CNH2)	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   E7-31 (TX-) - E15-12 (CNL1)	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   E7-31 (TX-) - E15-10 (CNL2)	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   E7-15 (TX+) - E7-31 (TX-)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   E7-15 (TX+) - E102-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   E7-31 (TX-) - E102-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   E7-15 (TX+) - E102-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   E7-31 (TX-) - E102-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

5. None

Result: 

OK 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

1. Disconnect the E7 combination meter assembly connector.
2. Using an oscilloscope, check the waveform.

   Standard Resistance

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   E7-15 (TX+) - E7-31 (TX-)	Ignition switch ON	1V/DIV., 100μs./DIV.	Pulse generation

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]