LIGHTING SYSTEM, Diagnostic DTC:B2424, B2425, B2440, B2441

DTC Code DTC Name
B2424 Lost Communication with Headlight Leveling ECU LH
B2425 Lost Communication with Headlight Leveling ECU RH
B2440 Lost Communication with AHS EDU LH Module
B2441 Lost Communication with AHS EDU RH Module

DESCRIPTION

The headlight ECU sub-assembly sends auto leveling control signals to the headlight leveling motor via LIN communication.

The headlight leveling motor operates according to the power supply and control signals from the headlight ECU sub-assembly and sends its operation status to the headlight ECU sub-assembly via LIN communication.

The headlight ECU sub-assembly sends AHS control signals to the light control LED ECU via LIN communication.

The light control LED ECU receives power and control signals from the headlight ECU sub-assembly, controls the additional LEDs and additional fans, and sends its operation status to the headlight ECU sub-assembly via LIN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B2424 Lost Communication with Headlight Leveling ECU LH

    Detection condition:

  • Engine switch on (IG)


    Malfunction status:

  • LIN communication is lost with headlight leveling motor LH


    Malfunction duration:

  • 10 seconds or more

  • Headlight unit assembly LH

  • Headlight leveling motor LH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH -
B2425 Lost Communication with Headlight Leveling ECU RH

    Detection condition:

  • Engine switch on (IG)


    Malfunction status:

  • LIN communication is lost with headlight leveling motor RH


    Malfunction duration:

  • 10 seconds or more

  • Harness or connector

  • Headlight unit assembly RH

  • Headlight leveling motor LH

  • Headlight ECU sub-assembly RH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH -
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 assembly LH

  • Light control LED ECU LH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH w/ Adaptive High Beam System
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 assembly RH

  • Light control LED ECU RH

  • Headlight ECU sub-assembly RH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH w/ Adaptive High Beam System
w/ Adaptive High Beam System:
Ouput DTC Suspected Area (Malfunction Status)
B2424 B2425 B2440 B2441
○ ○ ○ ○ LIN circuit (short)
Headlight ECU sub-assembly LH (Internal malfunction)
○ - ○ - Headlight ECU sub-assembly LH (Internal malfunction)
- ○ - ○ Headlight ECU sub-assembly RH (Internal malfunction)
○ - - - Headlight leveling motor LH power supply system abnormal
Headlight leveling motor LH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly LH to headlight leveling motor LH)
Headlight ECU sub-assembly LH (Internal malfunction)
- ○ - - Headlight leveling motor RH power supply abnormal
Headlight leveling motor RH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly RH to headlight leveling motor RH)
Headlight ECU sub-assembly RH (Internal malfunction)
- - ○ - Light control LED ECU LH power supply system abnormal
Light control LED ECU LH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly LH to light control LED ECU LH)
Headlight ECU sub-assembly LH (Internal malfunction)
- - - ○ Light control LED ECU RH power supply system abnormal
Light control LED ECU RH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly RH to light control LED ECU RH)
Headlight ECU sub-assembly RH (Internal malfunction)
○: DTC is output.
-: DTC is not output
w/o Adaptive High Beam System:
Ouput DTC Suspected Area (Malfunction Status)
B2424 B2425
○ ○ LIN circuit (short)
Headlight ECU sub-assembly LH (Internal malfunction)
○ - Headlight leveling motor LH power supply system abnormal
Headlight leveling motor LH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly LH to headlight leveling motor LH)
Headlight ECU sub-assembly LH (Internal malfunction)
- ○ Headlight leveling motor RH power supply abnormal
Headlight leveling motor RH (Internal malfunction)
Harness open circuit (Headlight ECU sub-assembly RH to headlight leveling motor RH)
Headlight ECU sub-assembly RH (Internal malfunction)
Headlight ECU sub-assembly LH (Internal malfunction)
○: DTC is output.
-: DTC is not output

WIRING DIAGRAM


  1. w/ Adaptive High Beam System:

    B006FVKE01
    B006ANKE01

  2. w/o Adaptive High Beam System:

    B006BTUE01

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. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/ Adaptive High Beam System A
      w/o Adaptive High Beam System B

    B

    CHECK FOR DTC Click here

    A

  2. 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 B2441 are not output A
      DTC B2424, B2425, B2440 and B2441 are output B
      DTC B2424 and B2440 are output C
      DTC B2425 and B2441 are output D
      DTC B2424 is output E
      DTC B2425 is output F
      DTC B2440 is output G
      DTC B2441 is output H

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    D

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH) Click here

    E

    CHECK HEADLIGHT UNIT ASSEMBLY LH Click here

    F

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    G

    CHECK HEADLIGHT UNIT ASSEMBLY LH Click here

    H

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. CHECK HEADLIGHT ASSEMBLY RH


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    4. Check for DTCs.

      Click here


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

    B

    CHECK HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    A

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


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

    2. Disconnect the A32 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
      A31-20 (LINL) or A32-20 (LINL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Remove the headlight ECU sub-assembly LH.

      Click here

    2. Reconnect the A31 headlight ECU sub-assembly LH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    B

  6. CHECK HEADLIGHT LEVELING MOTOR LH


    1. Disconnect the headlight leveling motor LH connector.

    2. Reconnect the except headlight leveling motor LH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    B

    REPLACE HEADLIGHT LEVELING MOTOR LH Click here

    A

  7. CHECK LIGHT CONTROL LED ECU LH


    1. Disconnect the light control LED ECU LH connector.

    2. Reconnect the except light control LED ECU LH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    A

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS) Click here

    B

    REPLACE LIGHT CONTROL LED ECU LH Click here

  8. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Remove the headlight ECU sub-assembly RH.

      Click here

    2. Reconnect the A32 headlight ECU sub-assembly RH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    B

  9. CHECK HEADLIGHT LEVELING MOTOR RH


    1. Disconnect the headlight leveling motor RH connector.

    2. Reconnect the except headlight leveling motor RH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    B

    REPLACE HEADLIGHT LEVELING MOTOR RH Click here

    A

  10. CHECK LIGHT CONTROL LED ECU RH


    1. Disconnect the light control LED ECU RH connector.

    2. Reconnect the except light control LED ECU RH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


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

    A

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS) Click here

    B

    REPLACE LIGHT CONTROL LED ECU RH Click here

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


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

    2. Disconnect the A32 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
      A31-20 (LINL) - A32-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B006AJ5C01
      *a

      Component with harness connected

      (Headlight ECU Sub-assembly RH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

      Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A31 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-13 - A31-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

  13. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the headlight unit assembly LH.

      Click here

      B006G9BC01
      *a

      Component without harness connected

      (Headlight ECU Sub-assembly LH)

      		 *b

      Component without harness connected

      (Headlight Leveling Motor LH)

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

      Standard Resistance
      Tester Connection Wiring Color Condition Specified Condition
      B-9 - J-1 W-BR Always Below 1 Ω
      B-17 - J-4 W-G Always Below 1 Ω
      C-13 - J-3 B-L Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS) Click here

    OK

  14. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B006EXZC03
      *a

      Component with harness connected

      (Headlight Leveling Motor LH)

      Disconnect the headlight leveling motor LH connector.

    2. Reconnect the except headlight leveling motor LH connector.

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

      Standard Voltage
      Tester Connection Wiring Color Switch Condition Specified Condition
      J-1 - J-4 W-BR - B-L Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  15. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B006AJ5C02
      *a

      Component with harness connected

      (Headlight ECU Sub-assembly LH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly RH)

      Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A32 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
      C-13 - A32-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LEVELING MOTOR LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  16. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight unit assembly RH.

      Click here

      B006G9BC01
      *a

      Component without harness connected

      (Headlight ECU Sub-assembly RH)

      		 *b

      Component without harness connected

      (Headlight Leveling Motor RH)

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

      Standard Resistance
      Tester Connection Wiring Color Condition Specified Condition
      B-9 - J-1 W-BR Always Below 1 Ω
      B-17 - J-4 W-G Always Below 1 Ω
      C-13 - J-3 B-L Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS) Click here

    OK

  17. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B006EXZC03
      *a

      Component with harness connected

      (Headlight Leveling Motor RH)

      Disconnect the headlight leveling motor RH connector.

    2. Reconnect the except headlight leveling motor RH connector.

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

      Standard Voltage
      Tester Connection Wiring Color Switch Condition Specified Condition
      J-1 - J-4 W-BR - B-L Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  18. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B006AJ5C01
      *a

      Component with harness connected

      (Headlight ECU Sub-assembly RH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

      Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A31 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-13 - A31-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LEVELING MOTOR RH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

  19. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the light control LED ECU LH.

      Click here

      B006DLQC02
      *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 Wiring Color Condition Specified Condition
      C-6 - L-8 L Always Below 1 Ω
      C-6 - L-16 L Always Below 1 Ω
      C-3 - K-11 R Always Below 1 Ω
      C-1 - L-7 G Always Below 1 Ω
      C-1 - L-15 G Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS) Click here

    OK

  20. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B006EXZC03
      *a

      Component with harness connected

      (Light Control LED ECU LH)

      Disconnect the light control LED ECU LH connector.

    2. Reconnect the except light control LED ECU LH connector.

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

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

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  21. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B006AJ5C02
      *a

      Component with harness connected

      (Headlight ECU Sub-assembly LH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly RH)

      Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A32 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
      C-3 - A32-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LIGHT CONTROL LED ECU LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  22. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the light control LED ECU RH.

      Click here

      B006DLQC02
      *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 Wiring Color Condition Specified Condition
      C-6 - L-8 L Always Below 1 Ω
      C-6 - L-16 L Always Below 1 Ω
      C-3 - K-11 R Always Below 1 Ω
      C-1 - L-7 G Always Below 1 Ω
      C-1 - L-15 G Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS) Click here

    OK

  23. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B006EXZC03
      *a

      Component with harness connected

      (Light Control LED ECU RH)

      Disconnect the light control LED ECU RH connector.

    2. Reconnect the except light control LED ECU RH connector.

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

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

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  24. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B006AJ5C01
      *a

      Component with harness connected

      (Headlight ECU Sub-assembly RH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

      Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A31 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-13 - A31-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LIGHT CONTROL LED ECU RH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

  25. 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 and B2425 are not output A
      DTC B2424 and B2425 are output B
      DTC B2424 is output C
      DTC B2425 is output D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO STEP 13 Click here

    D

    GO TO STEP 16 Click here

    B

  26. CHECK HEADLIGHT ASSEMBLY RH


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    2. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    4. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Result
      Result Proceed to
      DTC B2424 and B2425 are not output A
      DTC B2425 is output B

    B

    CHECK HEADLIGHT LEVELING MOTOR RH Click here

    A

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


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

    2. Disconnect the A32 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
      A31-20 (LINL) or A32-20 (LINL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  28. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Remove the headlight ECU sub-assembly LH.

      Click here

    2. Reconnect the A31 headlight ECU sub-assembly LH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Result
      Result Proceed to
      DTC B2424 and B2425 are not output A
      DTC B2424 is output B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    B

  29. CHECK HEADLIGHT LEVELING MOTOR LH


    1. Disconnect the headlight leveling motor LH connector.

    2. Reconnect the except headlight leveling motor LH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Result
      Result Proceed to
      DTC B2424 and B2425 are not output A
      DTC B2424 is output B

    A

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS) Click here

    B

    REPLACE HEADLIGHT LEVELING MOTOR LH Click here

  30. CHECK HEADLIGHT LEVELING MOTOR RH


    1. Disconnect the headlight leveling motor RH connector.

    2. Reconnect the except headlight leveling motor RH connector.

    3. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

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

    5. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Result
      Result Proceed to
      DTC B2424 and B2425 are not output A
      DTC B2425 is output B

    A

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS) Click here

    B

    REPLACE HEADLIGHT LEVELING MOTOR RH Click here