DTC B2456: Left Headlight ECU Variation Error [07/2022 - ]: Procedure

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   for Triple Beam Headlight	A
   for Single Beam Headlight	B

Result: 

B 

See step  4

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Enter the following menus: Body Electrical / AFS / Trouble Codes.
2. Check for DTCs.

   Body Electrical > AFS > 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 [10/2018 - ] 

Result: 

NG 

See step  6

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
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  5

1. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
2. 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 [10/2018 - ] 

Result: 

NG 

See step  6

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

   OK

   Part number is correct.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [07/2022 - ] 

Result: 

OK 

See step  7

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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2018 - ] 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [07/2022 - ]