LIGHTING SYSTEM, Diagnostic DTC:B243D, B243E

DTC Code DTC Name
B243D Left Low Beam Fan Malfunction
B243E Right Low Beam Fan Malfunction

DESCRIPTION

This DTC is output when the low beam fan is malfunctioning and the low beam illumination is dark.

The headlight light control ECU sub-assembly LH outputs DTC B243D and B243E
DTC No. Detection Item DTC Detection Condition Trouble Area
B243D Left Low Beam Fan Malfunction The headlight assembly LH low beam fan is malfunctioning and the low beam illumination is dark.

  • Headlight fan LH

  • Headlight unit LH

  • Headlight light control ECU sub-assembly LH
B243E Right Low Beam Fan Malfunction The headlight assembly RH low beam fan is malfunctioning and the low beam illumination is dark.

  • Headlight fan RH

  • Headlight unit RH

  • Headlight light control ECU sub-assembly RH

WIRING DIAGRAM

A01MIGBE04
*1 Headlight Fan
*2 Headlight Light Control ECU Sub-assembly
*3 Headlight Unit

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. Turn on the headlights using the headlight dimmer switch.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Result
      Result Proceed to
      DTCs B243D or B243E are not output A
      DTC B243D is output B
      DTC B243E 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 B243D output does not occur A
      DTC B243D output occurs B

    A

    END (HEADLIGHT FAN 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 B243E output does not occur A
      DTC B243E output occurs B

    A

    END (HEADLIGHT FAN RH WAS DEFECTIVE)

    B

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH Click here