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Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.
    3. Select the item below in the ACTIVE TEST and then check that the relay operates.

      MAIN BODY (MAIN BODY ECU): 

      DATA LIST

      Tester Display Test Part Control Range Diagnostic Note
      HEAD LIGHT (HI) DRL relay ON/OFF -

      OK: Relay operates. (High beam headlights illuminate.) 

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

    NG: Go to next step. 

  2. CHECK HARNESS AND CONNECTOR (SHORT IN RELAY-DRIVEN CIRCUIT) 
    1. Remove the H-LP (RH) fuse from the engine room junction block assembly.
    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. 

    Fig 1: Identifying H-LP (RH) Fuse
    G04980088Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: Go to next step. 

  3. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room junction block assembly.
    2. Measure the voltage between the loading slot of each fuse and body ground.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      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
    Fig 2: Identifying H-LP (RH) And H-LP (LH) Fuses
    G04980089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: Go to next step. 

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      DD-3 (HRLY) - Body ground Light control switch OFF → HEAD 10 to 14 V → Below 1 V
      DD-9 (DRL) - Body ground Light control switch in HEAD, dimmer switch LOW → HIGH 10 to 14 V → Below 1 V
      Fig 3: Identifying DD Connector Terminals
      G05252327Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 

    NG: Go to next step. 

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Disconnect the DD instrument panel junction block connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      DD-3 (HRLY) - Body ground Always 10 to 14 V
      DD-9 (DRL) - Body ground Always 10 to 14 V
      Fig 4: Identifying DD Connector Terminals
      G05252328Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    NG: Go to next step. 

  6. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Disconnect the 1D engine room junction block assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1D-8 - Body ground Always 10 to 14 V
      1D-9 - Body ground Always 10 to 14 V
    Fig 5: Identifying 1D Engine Room J/B Assembly Connector Terminal
    G04980079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY) 

    NG: Go to next step. 

  7. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the 1G engine room junction block assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1G-1 - Body ground Always 10 to 14 V
      Fig 6: Identifying 1G Connector Terminals
      G04980078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the 1E engine room J/B assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1E-11 - Body ground Always Below 1 Ω
    Fig 7: Identifying 1E Engine Room J/B Assembly Connector Terminal
    G04980085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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