DTC B2456: Left Headlight ECU Variation Error [09/2020 - 11/2021]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
5. Check for DTCs.

   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 [09/2020 - 11/2021] 

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: 

NG 

REPLACE ECM 

8AR-FTS: Refer to REMOVAL [08/2015 - ]

2GR-FKS: Refer to REMOVAL [10/2017 - ]

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 [09/2020 - ] 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [04/2013 - ]