DTC B2456: Left Headlight ECU Variation Error [11/2020 - 11/2021]: Procedure

1. Clear the DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Clear DTCs 

   for Stereo Camera Type:

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Trouble Codes 

   for Stereo Camera Type:

   Body Electrical > AFS > Trouble Codes 

   Result

   Result	Proceed to
   B2456 is not output	A
   B2456 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

Result: 

B 

See step  3

1. Check if the part number of the EV control ECU installed to the vehicle is correct.

   OK

   Part number is correct.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE EV CONTROL ECU. Refer to  INSTALLATION [11/2020 - 12/2022] 

Result: 

OK 

See step  4

1. Check if the part number of the main body ECU (multiplex network body ECU) installed to the vehicle is correct.

   OK

   Part number is correct.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2020 - 11/2021] 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2020 - 11/2021]