LIGHTING SYSTEM(for Triple Beam Headlight), Diagnostic DTC:B2443

DTC Code DTC Name
B2443 Lost Communication with Left Headlight and Right Headlight LIN

DESCRIPTION

This DTC is stored when a communication malfunction occurs between the headlight control ECU sub-assembly LH and headlight control ECU sub-assembly RH. The headlight ECU sub-assembly LH stores DTC B2443.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2443 Lost Communication with Left Headlight and Right Headlight LIN LIN communication malfunction occurs between headlight ECU sub-assembly LH and headlight ECU sub-assembly RH

  • Headlight ECU sub-assembly LH

  • Headlight ECU sub-assembly RH

  • Harness or connector

WIRING DIAGRAM

B004F80E08
*1 LINL
*2 Headlight ECU Sub-assembly RH
*3 Headlight ECU Sub-assembly LH
*4 LIN Communication Line

CAUTION / NOTICE / HINT

Note

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.

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. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B2443 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)


    1. Disconnect the A36 headlight ECU sub-assembly LH connector.

    2. Disconnect the A7 headlight ECU sub-assembly RH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-20 (LINL) - A7-20 (LINL) Always Below 1 Ω
      A36-20 (LINL) or A7-20 (LINL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Replace the headlight ECU sub-assembly RH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


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

    NEXT

  6. CHECK FOR DTC


    1. Turn the power switch on (IG).

    2. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B2443 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT ECU SUB-ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here