Lexus ES manuals

Lexus ES: Left Headlight ECU Variation Error (B2456)

Lexus ES (XZ10) Service Manual / Vehicle Interior / Lighting (ext) / Lighting System (for Gasoline Model) / Left Headlight ECU Variation Error (B2456)

DESCRIPTION

This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.

for LED Type Turn Signal Light

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2456

Left Headlight ECU Variation Error
  • The engine switch is on (IG).
  • Vehicle specification information received via CAN communication is continuously mismatched
  • -
  • ECM
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH

AFS
for Bulb Type Turn Signal Light

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2456

Left Headlight ECU Variation Error
  • The engine switch is on (IG).
  • Vehicle specification information received via CAN communication is continuously mismatched
  • -
  • ECM
  • Main body ECU (multiplex network body ECU)
  • Headlight ECU sub-assembly LH

HL AutoLeveling

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

  • Before replacing the ECM, refer to Registration.

    Click here

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.*1

    Click here

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.*2

    Click here

  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
    • *1: for LED Type Turn Signal Light
    • *2: for Bulb Type Turn Signal Light

PROCEDURE

1.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for LED Type Turn Signal Light

A

for Bulb Type Turn Signal Light

B
B

GO TO STEP 4

A

2.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > AFS > Clear DTCs
NEXT

3.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS / Trouble Codes.

(e) Check for DTCs.

Body Electrical > AFS > Trouble Codes

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

GO TO STEP 6

4.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > HL AutoLeveling > Clear DTCs
NEXT

5.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

(e) Check for DTCs.

Body Electrical > HL AutoLeveling > Trouble Codes

OK:

DTC B2456 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

6.

CHECK ECM

(a) Check if the part number of the ECM installed to the vehicle is correct.

OK:

Part number is correct.

NG

REPLACE ECM

OK

7.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) 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.

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

READ NEXT:

 Control Module Communication Bus Off (U0073,U0100,U0101,U0126,U0129,U0142,U0155,U0242)

DESCRIPTION These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly LH and other ECUs. for LED Type Turn Signal Light DTC No. Detection Item DTC D

 Control Module Communication Bus OFF (U0073,U0126,U0142,U0182)

DESCRIPTION These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly RH and other ECUs. for LED Type Turn Signal Light DTC No. Detection Item DTC D

 Lost Communication With ECM/PCM "A" (U0100,...,U1117)

DESCRIPTION These DTCs are stored if a CAN communication malfunction occurs between the main body ECU (multiplex network body ECU) and other ECUs. DTC No. Detection Item DTC Detection Condition

SEE MORE:

 Washer Fluid Level Warning Switch Circuit

DESCRIPTION When the washer fluid level is lower than a certain level, a warning message is displayed on the combination meter assembly. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHSTREAM (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstre

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of

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