LIGHTING SYSTEM, Diagnostic DTC:U0242

DTC Code DTC Name
U0242 Lost Communication With Headlamp Control Module "B"

DESCRIPTION

This DTC is output when communication between the headlight light control ECU sub-assembly LH and headlight light control ECU sub-assembly RH is lost.

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

  • Headlight light control ECU sub-assembly LH

  • Headlight light control ECU sub-assembly RH

  • Harness or connector

WIRING DIAGRAM

A01MGGNE15
*1 LINL
*2 Headlight Light Control ECU Sub-assembly LH
*3 Headlight Light Control ECU Sub-assembly RH
*4 LIN Communication Line

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
      DTC B2443 output does not occur A
      DTC B2443 output occurs B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Disconnect the A31 headlight light control ECU sub-assembly LH connector.

    2. Disconnect the A30 headlight light control 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
      A30-20 (LINL) - A31-20 (LINL) Always Below 1 Ω
      A30-20 (LINL) or A31-20 (LINL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH


    1. Remove the headlight light control ECU sub-assembly RH.

      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. 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
      DTC B2443 output does not occur A
      DTC B2443 output occurs B

    A

    END (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH IS DEFECTIVE)

    B

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH Click here