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Home >> Lexus >> 2010 >> IS 250C Standard >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting (Exterior) (Diagnostic Codes & Circuit Tests) >> Lighting System >> Headlight Solenoid Circuit >> Procedure

Headlight Solenoid Circuit: 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 / Body No. 5 / Active Test.
    5. Check that the high beam headlights operate.
      BODY NO. 5 (FRONT CONTROLLER)

      Tester Display Test Part Control Range Diagnostic Note
      Light Head (High) High beam headlights ON/OFF -

      OK

      High beam headlights come on.

    NG → See step   2 

    OK → See step   5 

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER) 
    1. Disconnect the B2 or B12 headlight assembly connector.
      Fig 1: Identifying B12 And B2 Connector Terminals
      GTY264893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Headlight Assembly)
      *2 LH Side
      *3 RH Side
    2. Measure the voltage according to the value(s) in the table.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B2-4 (B) - Body ground Light control switch in head position 11 to 14 V
      B12-4 (B) - Body ground Light control switch in head position 11 to 14 V

    NG → See step   4 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND) 
    1. Disconnect the B2 or B12 headlight assembly connector.
      Fig 2: Identifying B12 And B2 Connector Terminals
      GTY264892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Headlight Assembly)
      *2 LH Side
      *3 RH Side
    2. Measure the resistance according to the value(s) in the table.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B2-3 (E) - Body ground Always Below 1 Ω
      B12-3 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  4. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER - HEADLIGHT ASSEMBLY) 
    1. Disconnect the 2G front controller connector.
      Fig 3: Identifying B12, B2 And 2G Connector Terminals
      GTY256414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Headlight Assembly)
      *2 Front view of wire harness connector
      (to Front Controller)
      *3 LH Side
      *4 RH Side
    2. Disconnect the B2 or B12 headlight assembly connector.
    3. Measure the resistance according to the value(s) in the table.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2G-4 - B2-4 (B) Always Below 1 Ω
      2G-4 - B12-4 (B) Always Below 1 Ω
      2G-4 or B2-4 (B) - Body ground Always 10 kΩ or higher
      2G-4 or B12-4 (B) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 

  5. REPLACE HEADLIGHT ASSEMBLY. Refer to  COMPONENTS 
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