DTC U1000: CAN Communication Failure (Message Registry) [12/2019 - 11/2023]: Procedure

1. Clear the DTCs.

   Body Electrical > AFS > Clear DTCs 

   Body Electrical > AFS (Sub) > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Body Electrical > AFS > Trouble Codes 

   Body Electrical > AFS (Sub) > Trouble Codes 

   OK

   DTC U1000 is not output.

   Result

   Result	Proceed to
   OK	A
   NG (DTC output from headlight ECU sub-assembly LH)	B
   NG (DTC output from headlight ECU sub-assembly RH)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

B 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

C 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 11/2023]