LIGHTING SYSTEM, Diagnostic DTC:B2439, B243A

DTC Code DTC Name
B2439 Headlamp LH Circuit
B243A Headlamp RH Circuit

DESCRIPTION

This DTC is output when the headlight light control ECU sub-assembly receives an abnormal signal from the headlight unit.

The headlight light control ECU sub-assembly LH outputs DTC B2439 and B243A

DTC No. Detection Item DTC Detection Condition Trouble Area
B2439 Headlamp LH Circuit Headlight light control ECU sub-assembly LH light source malfunction

  • Headlight light control ECU sub-assembly LH

  • Headlight unit LH

  • Headlight unit Assembly LH
B243A Headlamp RH Circuit Headlight light control ECU sub-assembly RH light source malfunction

  • Headlight light control ECU sub-assembly RH

  • Headlight unit RH

  • Headlight unit Assembly RH

WIRING DIAGRAM

A01MJ6TE03

CAUTION / NOTICE / HINT

Note

After the headlight light control ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.

Click here

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Inspect the light using the dimmer switch.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Result
      Result Proceed to
      DTCs B2439 and B243A are not output A
      DTC B2439 is output B
      DTC B243A is output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. REPLACE HEADLIGHT UNIT ASSEMBLY LH


    1. Temporarily replace the headlight unit assembly LH with a new or normally functioning one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Inspect the light using the dimmer switch.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Result
      Result Proceed to
      DTC B2439 output does not occur A
      DTC B2439 output occurs B

    A

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

    B

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH Click here

  6. REPLACE HEADLIGHT UNIT ASSEMBLY RH


    1. Temporarily replace the headlight unit assembly RH with a new or normally functioning one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Inspect the light using the dimmer switch.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Result
      Result Proceed to
      DTC B243A output does not occur A
      DTC B243A output occurs B

    A

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

    B

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH Click here