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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) (Except Hybrid) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (for Gasoline Model) >> DTC B124B: Automatic High Beam System [08/2021 - ] >> Procedure

DTC B124B: Automatic High Beam System [08/2021 - ]: Procedure

  1. CHECK FOR DTC (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.

      Result

      Result Proceed to
      Only DTC B124B is output A
      DTC B124B and other DTCs are output B

    Result: 

    B 

    GO TO OTHER DTC CHART 

    Result: 

    A 

    See step  2

  2. CHECK FRONT CAMERA SYSTEM 
    1. Check if a dynamic radar cruise control system, lane tracing assist system, road sign assist system* or pre-collision system warning message is displayed on the multi-information display.

      Refer to DIAGNOSIS SYSTEM [08/2021 - ]

      OK

      No dynamic radar cruise control system, lane tracing assist system, road sign assist system* or pre-collision system warning messages are displayed.

      1. *: w/ Road Sign Assist System

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    GO TO FRONT CAMERA SYSTEM. Refer to  PROBLEM SYMPTOMS TABLE [08/2021 - ] 

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