Headlight Dimmer Switch: Inspection

2009 Toyota Yaris Base, 4D Sedan, AutomaticSECTION Inspection
  1. INSPECT HEADLIGHT DIMMER SWITCH 
    1. Check the resistance of the light control switch.
      1. Using an ohmmeter, measure the resistance and check the results in accordance with the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        10-11-12-13 OFF 10 kΩ or higher
        10-13 TAIL Below 1 Ω
        10-13 HEAD Below 1 Ω
        11-12 HEAD Below 1 Ω

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

        Fig 1: Identifying Terminals Of Headlight Dimmer Switch Connector
        G04832938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance of the headlight dimmer switch.
      1. Using an ohmmeter, measure the resistance and check the results in accordance with the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        9-11 FLASH Below 1 Ω
        8-11 LOW BEAM Below 1 Ω
        9-11 HI BEAM Below 1 Ω

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

    3. Check the resistance of the turn signal switch.
      1. Using an ohmmeter, measure the resistance and check the results in accordance with the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        6-7 Right turn Below 1 Ω
        5-6-7 Neutral 10 kΩ or higher
        5-7 Left turn Below 1 Ω

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

    4. w/ Front fog light:

      Check the resistance of the front fog light switch.

      1. Using an ohmmeter, measure the resistance and check the results in accordance with the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Condition Specified Condition
        3-4 OFF 10 kΩ or higher
        3-4 Front fog light switch ON Below 1 Ω

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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.