DTC B1321-87: Lost Communication with EMV Missing Message [11/2023 - ]: Procedure

1. Check if audio and visual 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 AUDIO AND VISUAL SYSTEM 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

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 audio and visual system, it can be suspected that the radio and display 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 [11/2023 - ]

Result: 

B 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

Refer to REMOVAL [11/2023 - ]