ADAPTIVE HIGH BEAM SYSTEM, Diagnostic DTC:B2440, B2441

DTC Code DTC Name
B2440 Lost Communication with AHS EDU LH Module
B2441 Lost Communication with AHS EDU RH Module

DESCRIPTION

The headlight ECU sub-assembly sends operation signals to the light control LED ECU and headlight leveling motor via LIN communication.

Each part also sends its operation condition to the headlight ECU sub-assembly via LIN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2440 Lost Communication with AHS EDU LH Module

    Detection Condition:

  • Engine switch on (IG)


    Malfunction Status:

  • LIN communication is lost with light control LED ECU LH


    Malfunction Duration:

  • 10 seconds or more

  • Headlight unit LH

  • Light control LED ECU LH

  • Headlight ECU sub-assembly LH
B2441 Lost Communication with AHS EDU RH Module

    Detection Condition:

  • Engine switch on (IG)


    Malfunction Status:

  • LIN communication is lost with light control LED ECU RH


    Malfunction Duration:

  • 10 seconds or more

  • Harness or connector

  • Headlight unit RH

  • Light control LED ECU RH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM

B005AKYE01
B00594QE01

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. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    2. Turn the engine switch on (IG) and wait for at least 10 seconds or more.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Result
      Result Proceed to
      DTC B2424, B2425 B2440 and B2451 are not output A
      DTC B2424, B2425, B2440 and B2451 are output B
      DTC B2424 and B2440 are output
      DTC B2425 and B2441 are output
      Only DTC B2440 is output C
      Only DTC B2425 is output D

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO DTC B2424 Click here

    D

    INSPECT HEADLIGHT UNIT ASSEMBLY RH Click here

    C

  2. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the light control LED ECU LH.

      Click here

      B00591CC01
      *a

      Component without harness connected

      (Headlight ECU Sub-assembly LH)

      		 *b

      Component without harness connected

      (Light Control LED ECU LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-6 - F-8 Always Below 1 Ω
      C-6 - F-16 Always Below 1 Ω
      C-1 - G-7 Always Below 1 Ω
      C-1 - G-15 Always Below 1 Ω
      C-13 - G-11 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B00589PC01
      *a

      Component without harness connected

      (Light Control LED ECU LH)

      Disconnect the light control LED ECU LH connector.

    2. Reconnect the headlight ECU sub-assembly LH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F-8 - F-7 Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LIGHT CONTROL LED ECU LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  4. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the light control LED ECU RH.

      Click here

      B00591CC01
      *a

      Component without harness connected

      (Headlight ECU Sub-assembly RH)

      		 *b

      Component without harness connected

      (Light Control LED ECU RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-6 - F-8 Always Below 1 Ω
      C-6 - F-16 Always Below 1 Ω
      C-1 - G-7 Always Below 1 Ω
      C-1 - G-15 Always Below 1 Ω
      C-13 - G-11 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B00589PC01
      *a

      Component without harness connected

      (Light Control LED ECU RH)

      Disconnect the light control LED ECU RH connector.

    2. Reconnect the headlight ECU sub-assembly RH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F-8 - F-7 Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LIGHT CONTROL LED ECU RH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here