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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes (1 Of 2) >> LIGHTING SYSTEM (w/ AFS) >> DTC B2424: Headlight Beam Level Control Motor LH Lost Communication; DTC B2425: Headlight Beam Level Control Motor RH Lost Communication [12/2019 - 11/2023] >> Procedure

DTC B2424: Headlight Beam Level Control Motor LH Lost Communication; DTC B2425: Headlight Beam Level Control Motor RH Lost Communication [12/2019 - 11/2023]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      OK

      DTC B2424 and B2425 are not output.

      Result

      Result Proceed to
      OK A
      NG (DTC B2424 is output) B
      NG (DTC B2425 is output) C
      NG (DTC B2424 and B2425 are output) D

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    C 

    See step  4

    Result: 

    D 

    See step  7

    Result: 

    B 

    See step  3

  3. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH 
    GTY886201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Headlight ECU Sub-assembly LH)    		 - -
    1. Remove the headlight ECU sub-assembly LH.

      Refer to REMOVAL [12/2019 - 11/2023]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-20 (LINL) - C-13 (LINLI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023] 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 11/2023] 

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Disconnect the A15 headlight ECU sub-assembly LH connector.
    2. Disconnect the A16 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
      A15-20 (LINL) - A16-20 (LINL) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (LINL TERMINAL SIGNAL OUTPUT) 
    GTY879985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Headlight ECU Sub-assembly RH)
    1. Connect the A15 headlight ECU sub-assembly LH connector.
    2. Using a GTS, check the waveform.

      OK

      Tester Connection Condition Specified Condition
      A16-20 (LINL) - Body ground Ignition switch ON Pulse generation

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    OK 

    See step  6

  6. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH 
    GTY886197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Headlight ECU Sub-assembly RH)    		 - -
    1. Remove the headlight ECU sub-assembly RH.

      Refer to REMOVAL [12/2019 - 11/2023]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A16-20 (LINL) - C-13 (LINLI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023] 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 11/2023] 

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Disconnect the A15 headlight ECU sub-assembly LH connector.
    2. Disconnect the A16 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
      A15-20 (LINL) or A16-20 (LINL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CLEAR DTC 
    1. Connect the A15 headlight ECU sub-assembly LH connector.
    2. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      Result

      Result Proceed to
      DTC B2425 is output A
      DTC B2424 and B2425 are output B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  10

  10. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH 
    1. Remove the headlight ECU sub-assembly RH.

      Refer to REMOVAL [12/2019 - 11/2023]

    2. Connect the A16 headlight ECU sub-assembly RH connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

  12. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      Result

      Result Proceed to
      DTC B2425 is output A
      DTC B2424 and B2425 are output B

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023] 

    Result: 

    B 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 11/2023] 

  13. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Remove the headlight ECU sub-assembly LH.

      Refer to REMOVAL [12/2019 - 11/2023]

    2. Connect the A15 headlight ECU sub-assembly LH connector.
    3. Connect the A16 headlight ECU sub-assembly RH connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  14

  14. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  15

  15. CHECK FOR DTC 
    1. Turn the ignition switch to ON.
    2. Wait 10 seconds or more.
    3. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      Result

      Result Proceed to
      DTC B2424 is output A
      DTC B2424 and B2425 are output B

    Result: 

    A 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 11/2023] 

    Result: 

    B 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [12/2019 - 11/2023] 

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