Lexus ES: Left Headlight ECU Variation Error (B2456)
DESCRIPTION
This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.
AFS*1| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| B2456 | Left Headlight ECU Variation Error |
|
| AFS |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| B2456 | Left Headlight ECU Variation Error |
|
| HL AutoLeveling |
- *1: for LED Type Turn Signal Light
- *2: for Bulb Type Turn Signal Light
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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-
Before replacing the hybrid vehicle control ECU, refer to Registration.
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-
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
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-
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 | .gif) | GO TO STEP 4 |
|
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| 2. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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
|
| 3. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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 CodesOK:
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 power 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
|
| 5. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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 CodesOK:
DTC B2456 is not output.
| OK | | USE SIMULATION METHOD TO CHECK |
|
| 6. | CHECK HYBRID VEHICLE CONTROL ECU |
(a) Check if the part number of the hybrid vehicle control ECU installed to the vehicle is correct.
OK:
Part number is correct.
| NG | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 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,U0101,U0126,U0129,U0142,U0155,U0242,U0293)
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:
Drive Motor "A" Inverter Actuator Stuck Closed (P0A7873)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC is stored when a short is detected in the inverter with converter assembly (motor inverter) or the hybrid vehicle transaxle assembly (motor (MG2)). The cause of this malfunction may be one of the following: Internal inverter malfunction
Motor inverter
Calibration
CALIBRATION NOTICE: When any of the following parts have been replaced, perform adjustment shown in the following table. If not, the parking support brake system may not operate correctly. PRECAUTION (PROCEDURE 1) (a) The necessary procedures (adjustment, calibration, initialization or registration)
