LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2010 >> IS 350C >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting (Exterior) (Diagnostic Codes & Circuit Tests) >> Lighting System >> High Beam Headlight Circuit >> Procedure

High Beam Headlight 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 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 illuminate.

    NG → See step   3 

    OK → See step   2 

  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  3. INSPECT FUSE (H-LP UPR) 
    1. Remove the H-LP UPR fuse from the No. 2 engine room relay block.
    2. Measure the resistance of the fuse.

      Standard Resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER - BATTERY) 
    1. Disconnect the 2E front controller connector.
      Fig 1: Identifying 2E Front Controller Connector Terminals
      GTY266944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Front Controller)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      2E-2 - Body ground Always 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER - BODY GROUND) 
    1. Check the wire harness between the headlight LH and front controller, and the headlight LH and body ground.
      Fig 2: Identifying B12 And 2G Connector Terminals
      GTY283778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Front Controller)
      *2 Front view of wire harness connector
      (to Headlight Assembly LH)
      1. Disconnect the 2G front controller connector.
      2. Disconnect the B12 headlight LH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        2G-13 - B12-2 (HI) Always Below 1 Ω
        2G-13 or B12-2 (HI) - Body ground Always 10 kΩ or higher
        B12-1 (E) - Body ground Always Below 1 Ω
    2. Check the wire harness between the headlight RH and front controller, and the headlight RH and body ground.
      Fig 3: Identifying 2G And B2 Connector Terminals
      GTY263865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Front Controller)
      *2 Front view of wire harness connector
      (to Headlight Assembly RH)
      1. Disconnect the 2G front controller connector.
      2. Disconnect the B2 headlight RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        2G-12 - B2-2 (HI) Always Below 1 Ω
        2G-12 or B2-2 (HI) - Body ground Always 10 kΩ or higher
        B2-1 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 

scientia non olet · About LEMON Manuals