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Headlight Dimmer Switch: Inspection

  1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance: Light control switch 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      12 (EL) - 20 (H) - 18 (T) - 19 (A) OFF 10 kΩ or higher
      12 (EL) - 18 (T) TAIL Below 1 Ω
      12 (EL) - 20 (H) -18 (T) HEAD Below 1 Ω
      12 (EL) - 19 (A) AUTO Below 1 Ω
      Fig 1: Identifying Headlight Dimmer Switch Assembly Connector Terminals
      G05132097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Dimmer switch 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      17 (HF) - 12 (EL) FLASH Below 1 Ω
      11 (HU) - 12 (EL) HIGH Below 1 Ω

      Turn signal switch 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      13 (TR) - 12 (EL) - 15 (TL) OFF 10 kΩ or higher
      13 (TR) - 12 (EL) RH Below 1 Ω
      15 (TL) - 12 (EL) LH Below 1 Ω

      Fog light switch 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      3 (LFG) - 4 (BFG) OFF 10 kΩ or higher
      3 (LFG) - 4 (BFG) ON Below 1 Ω

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

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