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High Beam Headlight Circuit [09/2014 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Perform the Active Test according to the display on the Techstream.
      MAIN BODY

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

      OK

      High beam headlights illuminate.

      Result

      Result Proceed to
      OK A
      NG (for Halogen Headlight) B
      NG (for LED Headlight) C

    B → See step   2 

    C → See step   7 

    A → See step   12 

  2. INSPECT 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 [09/2014 - ] .

      OK

      Output signal reading is normal.

    NG → See step   15 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND) See step   5 

    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 (DIMS) - 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. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL [09/2014 - ] .
      GTY477168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    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   14 

    OK: Go to next step 

  6. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Replace the engine room junction block assembly with a new or known good one. Refer to REMOVAL [09/2014 - ] .
    2. Check that the high beam headlights operate normally.

      OK

      High beam headlights operate normally.

    NG → See step   13 

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

  7. INSPECT DIMMER RELAY 
    1. Remove the DIMMER relay from the No. 2 engine room relay block and junction block assembly.
      GTY478394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (DIMMER Relay)

    NG → REPLACE DIMMER RELAY 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - DIMMER RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Relay Terminal 1 - Body ground Always 11 to 14 V
      Relay Terminal 3 - Body ground Always 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (DIMMER RELAY - HEADLIGHT ASSEMBLY) 
    1. Disconnect the A86 headlight assembly LH connector.
    2. Disconnect the A89 headlight assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay Terminal 5 - A86-3 (HI) Always Below 1 Ω
      Relay Terminal 5 - A89-3 (HI) Always Below 1 Ω
      Relay Terminal 5 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (DIMMER RELAY - 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
      Relay Terminal 2 - 3D-39 Always Below 1 Ω
      Relay Terminal 2 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL [09/2014 - ] .
      GTY477168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    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   17 

    OK → See step   16 

  12. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - ] 
  13. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 
  14. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 
  15. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK). Refer to  ON-VEHICLE INSPECTION [09/2014 - ] - Step 2 
  16. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 
  17. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 
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