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Headlight Dimmer Switch: Inspection

  1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Check the light control switch.
      1. Measure the resistance according to the value(s) in the table below.
        Fig 1: Identifying Headlight Dimmer Switch Connector Terminals
        G04944956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connection Switch Condition Specified Condition
        13 (T) - 11 (H) - 12 (A) - 19 (EL) Light control switch OFF 10 kΩ or higher
        13 (T) - 19 (EL) Light control switch TAIL Below 1 Ω
        13 (T) - 11 (H) - 19 (EL) Light control switch HEAD Below 1 Ω
        12 (A) - 19 (EL) Light control switch AUTO Below 1 Ω

        If the result is not as specified, replace the headlight dimmer switch.

    2. Check the headlight dimmer switch.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        Fig 2: Identifying Headlight Dimmer Switch Connector Terminals
        G04944957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        RESISTANCE SPECIFIED CONDITIONS

        Tester Connection Switch Condition Specified Condition
        14 (HF) - 19 (EL) Headlight dimmer switch FLASH Below 1 Ω
        15 (HL) - 19 (EL) Headlight dimmer switch LOW BEAM Below 1 Ω
        20 (HU) - 19 (EL) Headlight dimmer switch HI BEAM Below 1 Ω

        If the result is not as specified, replace the headlight dimmer switch.

        HINT:

        Perform the "LOW BEAM" and "HI BEAM" inspection with the light control switch on "HEAD".

    3. Check the turn signal switch.
      Fig 3: Locating Low Beam And Hi Beam Position
      G04944958Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        Fig 4: Identifying Terminals EL, TL, CR And TR Of Headlight Dimmer Switch Connector
        G04944959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        RESISTANCE SPECIFIED CONDITIONS

        Tester Connection Switch Condition Specified Condition
        17 (CR) - 16 (TR) - 19 (EL) Turn signal switch right turn Below 1 Ω
        16 (TR) - 19 (EL) Turn signal switch right lane change Below 1 Ω
        17 (CR) - 16 (TR) - 18 (TL) - 19 (EL) Turn signal switch neutral 10 kΩ or higher
        18 (TL) - 19 (EL) Turn signal switch left lane change Below 1 Ω
        17 (CR) - 18 (TL) - 19 (EL) Turn signal switch left turn Below 1 Ω

        If the result is not as specified, replace the headlight dimmer switch.

    4. Check fog light switch.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connection Switch Condition Specified Condition
        7 (BFOG) - 8 (LFOG) Front fog light switch OFF 10 kΩ or higher
        7 (BFOG) - 8 (LFOG) Front fog light switch ON Below 1 Ω
        Fig 5: Identifying Headlight Dimmer Switch Connector Terminals LFOG And BFOG
        G04944960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the front fog light switch.

    5. Check rear fog light switch.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        RESISTANCE SPECIFIED CONDITIONS

        Tester Connection Switch Condition Specified Condition
        9 (B) - 7 (BFOG) - 8 (LFOG) Rear fog light switch OFF 10 kΩ or higher
        9 (B) - 7 (BFOG) - 8 (LFOG) Rear fog light switch ON Below 1 Ω
        Fig 6: Identifying Headlight Dimmer Switch Terminals LFOG, BFOG And B
        G06188414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the rear fog light switch.

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