Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Height Sensor Initialization Incomplete (B2450)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Automatic Headlight Beam Level Control System) / Height Sensor Initialization Incomplete (B2450)

DESCRIPTION

The No. 1 headlight ECU sub-assembly LH stores this DTC if initialization has not been performed after it was replaced.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2450

Height Sensor Initialization Incomplete
  • The engine switch is on (IG).
  • No. 1 headlight ECU sub-assembly LH initialization not completed
  • -

No. 1 headlight ECU sub-assembly LH

AFS

CAUTION / NOTICE / HINT

NOTICE:

  • If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.

    Click here

  • If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.*

    Click here

  • When replacing the No. 1 headlight ECU sub-assembly LH, always replace it with a new one. If a No. 1 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.
  • When replacing the headlight assembly LH, always replace it with a new one. If a headlight 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.*
    • *: for TMMC Made

PROCEDURE

1.

INITIALIZATION NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Perform initialization of the No. 1 headlight ECU sub-assembly LH.

Click here

NEXT

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 B2450 is not output.

HINT:

If the No. 1 headlight ECU sub-assembly LH stores DTC B2450 even though the ECU has been initialized, there may be a malfunction in the No. 1 headlight ECU sub-assembly LH.

OK

END (INITIALIZATION WAS NOT COMPLETED)
NG

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH

    Headlight LH Circuit (B2439,B243A)
    DESCRIPTION The No. 1 headlight ECU sub-assembly LH and No. 1 headlight ECU sub-assembly RH internally boost the power supply voltage to ensure a constant supplied current for the lo/hi beam LED of th ...

    Variation Code not Written (B2451)
    DESCRIPTION The No. 1 headlight ECU sub-assembly LH stores this DTC if the vehicle specifications have not been stored. DTC No. Detection Item DTC Detection Condition Trouble Area DTC Outpu ...

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