DTC U1000: CAN Communication Failure (Message Registry) [03/2017 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

2. Turn the engine switch on (IG).
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

   OK

   DTC U1000 is not output.

   Result

   Result	Proceed to
   OK	A
   NG (DTC output from No. 1 headlight ECU sub-assembly LH)	B
   NG (DTC output from No. 1 headlight ECU sub-assembly RH)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2020 - 05/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ] 

Result: 

B 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

C 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ]