DTC B1321: Lost Communication with EMV [08/2019 - ]: Procedure

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   w/o Navigation System	A
   w/ Navigation System	B

Result: 

B 

See step  3

Result: 

A 

See step  2

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: 

A 

See step  4

Result: 

B 

GO TO AUDIO AND VISUAL SYSTEM 

for 12.3 Inch Display: Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ]

for 8 Inch Display: Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ]

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 [08/2019 - ] 

Result: 

A 

See step  4

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

   Body Electrical > Combination Meter > Trouble Codes 

   HINT: 

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

   Result

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

Result: 

A 

REPLACE HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY). Refer to  REMOVAL [08/2019 - ] 

Result: 

B 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2019 - ]