DTC B1321-87: Lost Communication with EMV Missing Message [12/2019 - 10/2022]: 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  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] 

Result: 

A 

See step  2

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

   Body Electrical > Combination Meter > Trouble Codes 

   HINT: 

   • If DTC B1321-87 is output from the headup display system and is not output from the meter / gauge system, it can be suspected that the meter mirror sub-assembly has an internal malfunction.
   • If DTC B1321-87 is output from the meter / gauge system and is not output from the navigation system, it can be suspected that the radio receiver assembly has an internal malfunction.

   Result

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

Result: 

A 

REPLACE METER MIRROR SUB-ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

B 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]