DTC B1321: Lost Communication with EMV [07/2020 - 05/2023]: Procedure

1. Check if navigation system DTCs are output.

   Refer to DTC CHECK / CLEAR [07/2020 - 10/2022] , or refer to DTC CHECK / CLEAR [10/2022 - 05/2023]

   Body Electrical > Navigation System > Trouble Codes 

   Result

   Result	Proceed to
   Navigation system DTCs are not output.	A
   Navigation system DTCs are output.	B

Result: 

B 

GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - 05/2023] 

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the No. 4 global CAN junction connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P116-8 - P116-19	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P116-11 - P116-22	Cable disconnected from negative (-) battery terminal	200 Ω or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NO. 4 GLOBAL CAN JUNCTION CONNECTOR 

Result: 

NG 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the combination meter assembly connector.
2. Reconnect the P116 No. 4 global CAN junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P26-10 (TX+) - P26-9 (TX-)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the radio receiver assembly connector.
2. Reconnect the P116 No. 4 global CAN junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P46-5 (CNH1) - P46-6 (CNL1)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 05/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR