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Headlight (HI-BEAM) Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Body Electrical / Main Body / Active Test.
    5. Check that the relay operates.
      MAIN BODY:

      Tester Display Test Part Control Range Diagnostic Note
      Head Light (Hi) HI-beam headlight relay ON / OFF -

      OK

      Relay operates. (HI-beam headlights illuminate.)

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

    NG: Go to next step 

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 1: Identifying Instrument Panel J/B Assembly Connector
      GTY180870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      ID-3 (HRLY) - Body ground Light control switch OFF → HEAD 10 to 14 V → Below 1 V
      ID-9 (DRL) - Body ground Light control switch in HEAD, dimmer switch LOW → HIGH 10 to 14 V → Below 1 V

    OK → See step   6 

    NG: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the 1G engine room J/B assembly connector.
      Fig 2: Identifying Engine Room J/B Assembly
      GTY120225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      1G-1 - Body ground Always 10 to 14 V
    3. Disconnect the 1E engine room J/B assembly connector.
      Fig 3: Identifying 1E Engine Room J/B Assembly Connector Terminal
      GTY151330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      1E-11 - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Reconnect the 1G and 1E engine room J/B assembly connectors.
    2. Disconnect the 1D engine room J/B assembly connector.
      Fig 4: Identifying 1D Engine Room J/B Assembly Connector Terminal
      GTY151337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      1D-8 - Body ground Always 10 to 14 V
      1D-9 - Body ground Always 10 to 14 V

    NG → REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY) 
    1. Reconnect the 1D engine room J/B assembly connector.
    2. Disconnect the ID instrument panel J/B connector.
      Fig 5: Identifying 1D Engine Room J/B Assembly Connector Terminal
      GTY206482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      ID-3 (HRLY) - Body ground Always 10 to 14 V
      ID-9 (DRL) - Body ground Always 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (SHORT IN RELAY-DRIVEN CIRCUIT) 
    1. Remove the H-LP (RH) fuse from the engine room J/B assembly.
      Fig 6: Identifying H-LP (RH) Fuse From Engine Room J/B Assembly
      GTY132014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the light control switch to the HEAD position and turn the dimmer switch to the HIGH position.
    3. Check if the high beam headlight LH illuminates.
    4. Turn the dimmer switch to the LOW position.
    5. Install the H-LP (RH) fuse and remove the H-LP (LH) fuse.
    6. Turn the dimmer switch to the HIGH position.
    7. Check if the high beam headlight RH illuminates.

      OK

      Either high beam headlight LH or RH illuminates.

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (SHORT CIRCUIT BETWEEN FUSE AND BULB) 

    NG: Go to next step 

  7. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room J/B assembly.
      Fig 7: Identifying H-LP (RH) Fuse And H-LP (LH) Fuse From Engine Room J/B Assembly
      GTY123068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the loading slot of each fuse and body ground.

      Standard voltage

      Tester Connection Condition Specified Condition
      H-LP (RH) Terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 10 to 14 V
      H-LP (LH) Terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 10 to 14 V

    NG → REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (POWER DISTRIBUTOR) 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (OPEN CIRCUIT BETWEEN FUSE AND BODY GROUND) 

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