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Home >> Lexus >> 2010 >> IS 250 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting (Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B2412: Headlight Swivel Motor LH Malfunction; DTC B2413: Headlight Swivel Motor RH Malfunction >> Procedure

DTC B2412: Headlight Swivel Motor LH Malfunction; DTC B2413: Headlight Swivel Motor RH Malfunction: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Active Test.
    5. Check the operation.
      AFS (AFS ECU)

      Tester Display Test Part Control Range Diagnostic Note
      Drive The Swivel Motor RH Swivel motor RH right direction rotation RIGHT/OFF -
      Drive The Swivel Motor LH Swivel motor LH left direction rotation LEFT/OFF -

      OK

      Swivel motor operates.

      Result

      Result Proceed to
      OK (When checking from PROBLEM SYMPTOMS TABLE) A
      OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B
      NG C

    C → See step   2 

    B → REPLACE AFS ECU 

    A → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. INSPECT HEADLIGHT ASSEMBLY 
    Fig 1: Identifying Headlight Assembly Connector Terminals
    GTY141521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B12 and B2 headlight assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      LH Side (B2412) 

      RH Side (B2413) 

      Tester Connection Condition Specified Condition
      B12-23 (BL1-) - B12-24 (BL1+) Always 6 to 8 Ω
      B12-21 (BL2-) - B12-22 (BL2+) Always 6 to 8 Ω
      Tester Connection Condition Specified Condition
      B2-23 (BR1-) - B2-24 (BR1+) Always 6 to 8 Ω
      B2-21 (BR2-) - B2-22 (BR2+) Always 6 to 8 Ω

      HINT: 

      Measure the resistance after the headlight has cooled.

    NG → REPLACE HEADLIGHT ASSEMBLY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - AFS ECU) 
    Fig 2: Identifying AFS ECU And Headlight Assembly Connector Terminal
    GTY137472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A28 AFS ECU connector.
    2. Disconnect the B12 and B2 headlight connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      LH Side (B2412) 

      RH Side (B2413) 

      Tester Connection Condition Specified Condition
      A28-25 (BL1+) - B12-24 (BL1+) Always Below 1 Ω
      A28-26 (BL1-) - B12-23 (BL1-) Always Below 1 Ω
      A28-27 (BL2+)- B12-22 (BL2+) Always Below 1 Ω
      A28-28 (BL2-) - B12-21 (BL2-) Always Below 1 Ω
      A28-19 (SMGL) - B12-19 (SMGL) Always Below 1 Ω
      A28-24 (SML) - B12-18 (SML) Always Below 1 Ω
      A28-22 (SMBL) - B12-20 (SMBL) Always Below 1 Ω
      A28-29 (LL1+) - B12-15 (LL1+) Always Below 1 Ω
      A28-30 (LL1-) - B12-14 (LL1-) Always Below 1 Ω
      A28-31 (LL2+) - B12-13 (LL2+) Always Below 1 Ω
      A28-32 (LL2-) - B12-12 (LL2-) Always Below 1 Ω
      A28-25 (BL1+) - Body ground Always 10 kΩ or higher
      A28-26 (BL1-) - Body ground Always 10 kΩ or higher
      A28-27 (BL2+) - Body ground Always 10 kΩ or higher
      A28-28 (BL2-) - Body ground Always 10 kΩ or higher
      A28-19 (SMGL) - Body ground Always 10 kΩ or higher
      A28-24 (SML) - Body ground Always 10 kΩ or higher
      A28-22 (SMBL) - Body ground Always 10 kΩ or higher
      A28-29 (LL1+) - Body ground Always 10 kΩ or higher
      A28-30 (LL1-) - Body ground Always 10 kΩ or higher
      A28-31 (LL2+) - Body ground Always 10 kΩ or higher
      A28-32 (LL2-) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      A28-9 (BR1+) - B2-24 (BR1+) Always Below 1 Ω
      A28-10 (BR1-) - B2-23 (BR1-) Always Below 1 Ω
      A28-11 (BR2+) - B2-22 (BR2+) Always Below 1 Ω
      A28-12 (BR2-) - B2-21 (BR2-) Always Below 1 Ω
      A28-18 (SMGR) - B2-19 (SMGR) Always Below 1 Ω
      A28-21 (SMBR) - B2-20 (SMBR) Always Below 1 Ω
      A28-23 (SMR) - B2-18 (SMR) Always Below 1 Ω
      A28-13 (LR1+) - B2-15 (LR1+) Always Below 1 Ω
      A28-14 (LR1-) - B2-14 (LR1-) Always Below 1 Ω
      A28-15 (LR2+) - B2-13 (LR2+) Always Below 1 Ω
      A28-16 (LR2-) - B2-12 (LR2-) Always Below 1 Ω
      A28-9 (BR1+) - Body ground Always 10 kΩ or higher
      A28-10 (BR1-) - Body ground Always 10 kΩ or higher
      A28-11 (BR2+) - Body ground Always 10 kΩ or higher
      A28-12 (BR2-) - Body ground Always 10 kΩ or higher
      A28-18 (SMGR) - Body ground Always 10 kΩ or higher
      A28-21 (SMBR) - Body ground Always 10 kΩ or higher
      A28-23 (SMR) - Body ground Always 10 kΩ or higher
      A28-13 (LR1+) - Body ground Always 10 kΩ or higher
      A28-14 (LR1-)- Body ground Always 10 kΩ or higher
      A28-15 (LR2+) - Body ground Always 10 kΩ or higher
      A28-16 (LR2-) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK AFS ECU 
    Fig 3: Identifying Headlight Assembly Connector Terminals
    GTY150262Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B12 and B2 headlight connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      LH Side (B2412) 

      RH Side (B2413) 

      Tester Connection Condition Specified Condition
      B12-20 (SMBL) - B12-19 (SMGL) Engine switch off Below 1 V
      Engine switch on (IG) 4.5 to 5.5 V
      Tester Connection Condition Specified Condition
      B2-20 (SMBR) - B2-19 (SMGR) Engine switch off Below 1 V
      Engine switch on (IG) 4.5 to 5.5 V

    NG → REPLACE AFS ECU 

    OK: Go to next step 

  5. REPLACE HEADLIGHT ASSEMBLY 
    1. Temporarily replace the headlight assembly with a new or normally functioning one.
    2. Check that the headlight assembly operates.

      OK

      Returns to normal operation.

    NG → REPLACE AFS ECU 

    OK → END 

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