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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 / Main Body / Active Test.
    5. Check that the high beam headlights illuminate.
      MAIN BODY

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

      OK

      The high beam headlights illuminate.

    NG → See step   2 

    OK → See step   7 

  2. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Using a voltmeter, check the signal reading of the engine room junction block assembly. Refer to ON-VEHICLE INSPECTION .

      OK

      Output signal reading is normal.

    NG → See step   10 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND) See step   4 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1F-5 - 3D-39 Always Below 1 Ω
      3D-39 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
      Fig 1: Measuring Resistance Of Instrument Panel Junction Block Assembly
      GTY368444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3D-39 - MB-26 (DIM) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)

    NG → See step   9 

    OK: Go to next step 

  6. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Replace the engine room junction block assembly with a new or known good one. Refer to REMOVAL .
    2. Check that the high beam headlights operate normally.

      OK

      The high beam headlights operate normally.

    NG → See step   8 

    OK → END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) 

  7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  8. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL 
  9. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL 
  10. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK). Refer to  ON-VEHICLE INSPECTION - Step 2 
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