ADAPTIVE HIGH BEAM SYSTEM, Diagnostic DTC:B2492, B2493

DTC Code DTC Name
B2492 Left Headlight Driver Module Circuit
B2493 Right Headlight Driver Module Circuit

DESCRIPTION

The headlight light control ECU sub-assembly receives high beam light distribution variable control signals from the headlight ECU sub-assembly via LIN communication and performs adaptive high beam control by varying the current sent to the LED array based on those signals. This DTC is stored when a malfunction occurs in the power supplied to the LED array. The headlight ECU sub-assembly LH outputs DTCs B2492 and B2493.

DTC Code DTC Detection Condition Trouble Area
B2492

  • LED array LH malfunction

  • Headlight light control ECU sub-assembly LH malfunction

  • Headlight unit LH

  • Headlight unit assembly LH

  • Headlight light control ECU sub-assembly LH
B2493

  • LED array RH malfunction

  • Headlight light control ECU sub-assembly RH malfunction

  • Headlight unit RH

  • Headlight unit assembly RH

  • Headlight light control ECU sub-assembly RH

WIRING DIAGRAM

B001B03E06

CAUTION / NOTICE / HINT

Note

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information Click here.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the high beam headlights.

    3. Check for DTCs Click here.

      OK
      DTC B2492 and B2493 are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2492 is output) B
      NG (DTC B2493 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. Remove the headlight assembly LH Click here.

    2. Remove the headlight unit assembly LH from the headlight assembly LH Click here.

    3. Remove the headlight light control ECU sub-assembly LH Click here.

    4. B00187RE02
      Text in Illustration
      *a

      Component without harness connected

      (Headlight Unit LH (LED Array) Side Connector)
      *b

      Component without harness connected

      (Headlight Light Control ECU Sub-assembly LH Side Connector)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K-2 - M-1 Always Below 1 Ω
      K-3 - M-2 Always Below 1 Ω
      K-11 - M-3 Always Below 1 Ω
      K-12 - M-4 Always Below 1 Ω
      K-13 - N-2 Always Below 1 Ω
      K-14 - N-3 Always Below 1 Ω
      K-15 - N-4 Always Below 1 Ω
      K-16 - N-5 Always Below 1 Ω
      K-17 - N-6 Always Below 1 Ω
      K-18 - N-7 Always Below 1 Ω
      K-19 - N-8 Always Below 1 Ω
      K-20 - N-9 Always Below 1 Ω

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  4. REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH


    1. Replace the headlight light control ECU sub-assembly LH with a new or known good one Click here.


    NEXT

  5. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the high beam headlights.

    3. Check for DTCs Click here.

      OK
      DTC B2492 is not output.

    OK

    END (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH (LED ARRAY) Click here

  7. REPLACE HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight assembly RH Click here.

    2. Remove the headlight unit assembly RH from the headlight assembly RH Click here.

    3. Remove the headlight light control ECU sub-assembly RH Click here.

    4. B001A9YE02
      Text in Illustration
      *a

      Component without harness connected

      (Headlight Unit RH (LED Array) Side Connector)
      *b

      Component without harness connected

      (Headlight Light Control ECU Sub-assembly RH Side Connector)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K-2 - M-1 Always Below 1 Ω
      K-3 - M-2 Always Below 1 Ω
      K-11 - M-3 Always Below 1 Ω
      K-12 - M-4 Always Below 1 Ω
      K-13 - N-2 Always Below 1 Ω
      K-14 - N-3 Always Below 1 Ω
      K-15 - N-4 Always Below 1 Ω
      K-16 - N-5 Always Below 1 Ω
      K-17 - N-6 Always Below 1 Ω
      K-18 - N-7 Always Below 1 Ω
      K-19 - N-8 Always Below 1 Ω
      K-20 - N-9 Always Below 1 Ω

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  8. REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH


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


    NEXT

  9. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  10. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the high beam headlights.

    3. Check for DTCs Click here.

      OK
      DTC B2493 is not output.

    OK

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

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH (LED ARRAY) Click here