Lexus ES: Variation Code not Written (B2451)
DESCRIPTION
The headlight ECU sub-assembly LH stores this DTC if the vehicle specifications have not been stored.
for LED Type Turn Signal Light| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| B2451 | Variation Code not Written |
| Headlight ECU sub-assembly LH | AFS |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| B2451 | Variation Code not Written |
| Headlight ECU sub-assembly LH | HL AutoLeveling |
CAUTION / NOTICE / HINT
NOTICE:
-
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
.gif)
-
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. | SYNCHRONIZE VEHICLE INFORMATION |
(a) Synchronize the vehicle information.
Click here
|
.gif)
| 2. | 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 5 |
|
| 3. | 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
|
| 4. | 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 B2451 is not output.
HINT:
If the headlight ECU sub-assembly LH stores DTC B2451 even though the vehicle information has been synchronized, the headlight ECU sub-assembly LH may be malfunctioning.
| OK | | END (VEHICLE SPECIFICATIONS WERE NOT STORED) |
| NG | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
| 5. | 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
|
| 6. | 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 B2451 is not output.
HINT:
If the headlight ECU sub-assembly LH stores DTC B2451 even though the vehicle information has been synchronized, the headlight ECU sub-assembly LH may be malfunctioning.
| OK | | END (VEHICLE SPECIFICATIONS WERE NOT STORED) |
| NG | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
READ NEXT:
Abnormal Height Sensor Data at Initialization (B2452)
DESCRIPTION The headlight ECU sub-assembly LH stores this DTC if the value from the rear height control sensor sub-assembly LH is out of range when performing initialization of the headlight ECU sub-a
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
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
SEE MORE:
On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (a) Before cleaning, or after cleaning the throttle body with motor assembly and installing it to the vehicle, turn the engine switch on (IG) without operating the accelerator pedal sensor assembly. NOTICE: If the accelerat
Installation
INSTALLATION PROCEDURE 1. INSTALL NAVIGATION ECU 2. INSTALL NO. 1 RADIO RECEIVER BRACKET (a) Install the No. 1 radio receiver bracket with the 2 screws. 3. INSTALL NAVIGATION ECU WITH BRACKET (a) Engage the 4 claws to temporarily install the navigation ECU with bracket as shown in the illustration.
