DTC B1321-87: Lost Communication with EMV Missing Message [10/2018 - 07/2022]: Procedure

1. Check if navigation system DTCs are output.

   Body Electrical > Navigation System > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

B 

GO TO NAVIGATION SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 10/2019]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2019 - 07/2022] 

Result: 

A 

See step  2

1. Disconnect the F25 meter mirror sub-assembly connector.
2. Check if navigation system DTCs are output.

   Body Electrical > Navigation System > Trouble Codes 

   HINT: 

   If navigation system DTCs are output, it can be judged that the radio receiver assembly could perform local bus communication line diagnosis, therefore the navigation system may not be malfunctioning.

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

A 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2018 - 10/2019]  Refer to  REMOVAL [10/2019 - 07/2022] 

Result: 

B 

REPLACE METER MIRROR SUB-ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022]