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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Body / Data List/
    5. According to the display on tester, read the "Data List".

      Body (Main Body ECU) 

      BODY (MAIN BODY ECU)

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      High Flasher SW Passing light switch signal / ON or OFF ON: Headlight dimmer switch is in FLASH (PASS) position
      OFF: Headlight dimmer switch is not in FLASH (PASS) position      		 -
      Dimmer SW Dimmer switch signal/ON or OFF ON: Dimmer switch is ON (High Beam) or High flasher switch is ON
      OFF: Dimmer switch is OFF (Low Beam) or High flasher switch is OFF      		 -
      Head Light SW Headlight control switch signal / ON or OFF ON: Light control switch is in HEAD position
      OFF: Light control switch is not in HEAD position      		 -
      Tail Light SW Taillight switch signal / ON or OFF ON: Light control switch is in TAIL or HEAD position
      OFF: Light control switch is in OFF position      		 -

      OK: Condition information can be displayed. 

    NG: Go to step 2 

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

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Remove the headlight dimmer switch assembly.
      2. Fig 1: Identifying Headlight Dimmer Switch
      G05580512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according value(s) in the table below.
      1. Light Control Switch:

        Standard resistance 

        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        14 (T) - 16 (EL) OFF 10 kΩ or higher
        13 (H) - 16 (EL)
        14 (T) - 16 (EL) TAIL Below 1 Ω
        13 (H) - 16 (EL) 10 kΩ or higher
        14 (T) - 16 (EL) HEAD Below 1 Ω
        13 (H) - 16 (EL) Below 1 Ω
      2. Headlight Dimmer Switch Switch:

        Standard resistance 

        STANDARD RESISTANCE

        Tester Connection Condition Specified Condition
        7 (HU) - 16 (EL) HIGH BEAM Below 1 Ω
        17 (HL) - 16 (EL) LOW BEAM Below 1 Ω
        7 (HU) - 8 (HF) - 16 (EL) FLASH Below 1 Ω
    3. Reinstall the headlight dimmer switch assembly.

    NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY  (See REMOVAL  )

    OK: Go to next step. 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ECU) 
    1. Disconnect the E8 main body ECU connector.
      2. Fig 2: Checking Harness And Connector (Headlight Dimmer Switch ECU)
      G05113555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E20 headlight dimmer switch assembly connector.
    3. Measure the resistance according value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E20-8 (HF) - E8-7 (HF) Always Below 1 Ω
      E20-8 (HF) or E8-7 (HF) - Body ground Always 10 kΩ or higher
      E20-14 (T) - E8-8 (TAIL) Always Below 1 Ω
      E20-14 (T) or E8-8 (TAIL) - Body ground Always 10 kΩ or higher
      E20-13 (H) - E8-1 (HEAD) Always Below 1 Ω
      E20-13 (H) or E8-1 (HEAD) - Body ground Always 10 kΩ or higher
      E20-7 (HU) - E8-2 (HU)* Always Below 1 Ω
      E20-7 (HU) or E8-2 (HU)* - Body ground Always 10 kΩ or higher
      E20-16 (EL) - Body ground Always Below 1 Ω
      HINT:
      *: w/ Daytime running light system
    4. Reconnect the main body ECU connector.
    5. Reconnect the headlight dimmer switch assembly connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - HEADLIGHT*) 

    HINT:

    *: w/o Daytime running light system

    1. Disconnect the E20 headlight dimmer switch assembly connector.
      2. Fig 3: Checking Harness And Connector (Headlight Dimmer Switch - Headlight*)
      G05113556Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A23 and A24 headlight connectors.
    3. Measure the resistance according value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      E20-17 (HL) - A23-1 Always Below 1 Ω
      E20-17 (HL) - A24-1 Always Below 1 Ω
      E20-7 (HU) - A23-2 Always Below 1 Ω
      E20-7 (HU) - A24-2 Always Below 1 Ω
    4. Reconnect the headlight dimmer switch assembly connector.
    5. Reconnect the headlight connectors.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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