DTC B2456: Left Headlight ECU Variation Error [09/2014 - 03/2019]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

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

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   OK

   DTC B2456 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019] 

Result: 

NG 

See step  3

1. Check if the part number of the ECM installed to the vehicle is correct.

   OK

   Part number is correct.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 03/2019] 

Result: 

NG 

REPLACE ECM WITH CORRECT ONE. Refer to  REMOVAL [09/2014 - ]