DTC U1000: CAN Communication Failure (Message Registry) [10/2015 - 08/2019]: Procedure

1. for Single Beam Headlight without AFS (Adaptive Front-lighting System):
   1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Body Electrical > HL AutoLeveling > Clear DTCs 

2. for Triple Beam Headlight, for Single Beam Headlight with AFS (Adaptive Front-lighting System):
   1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the power switch on (IG).
2. for Single Beam Headlight without AFS (Adaptive Front-lighting System):
   1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Body Electrical > HL AutoLeveling > Trouble Codes 

      OK

      DTC U1000 is not output.

3. for Triple Beam Headlight, for Single Beam Headlight with AFS (Adaptive Front-lighting System):
   1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2015 - 08/2019]

      Body Electrical > AFS > Trouble Codes 

      OK

      DTC U1000 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 12/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 03/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2018 - 08/2019] 

Result: 

NG 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019]