DTC B2456: Left Headlight ECU Variation Error [10/2014 - 09/2017]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - 09/2017]

   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 [10/2014 - 09/2017]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   Result

   Proceed to
   DTC B2456 output does not occur
   DTC B2456 output occurs

Result: 

DTC B2456 output does not occur 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017] 

Result: 

DTC B2456 output occurs 

See step  3

1. Check that the ECM part number matches the vehicle.

   Result

   Result	Proceed to
   ECM part number matches vehicle	A
   ECM part number does not match	B

Result: 

A 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

B 

REPLACE ECM WITH CORRECT ONE. Refer to  REMOVAL [10/2014 - 05/2019]