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Headlight Dimmer Switch: Inspection

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT HEADLIGHT DIMMER SWITCH 
    1. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      20 (H) - 12 (EL) Light control switch OFF 10 kΩ or higher
      18 (T) - 12 (EL)
      19 (A) - 12 (EL)
      18 (T) - 12 (PL) Light control switch TAIL Below 1 Ω
      18 (T) - 12 (EL) Light control switch HEAD Below 1 Ω
      20 (H) - 12 (EL)
      19 (A) - 12 (EL) Light control switch AUTO Below 1 Ω
      Fig 1: Identifying Headlight Dimmer Switch Connector Terminals
      G05782974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      17 (HF) - 12 (EL) Headlight dimmer switch FLASH Below 1 Ω
      16 (HL) - 12 (EL) Headlight dimmer switch LOW BEAM Below 1 Ω
      11 (HU) - 12 (EL) Headlight dimmer switch HI BEAM Below 1 Ω

      HINT

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

    3. Measure the resistance according to the value (s) in the table below

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      14 (CR) - 12 (EL) Turn signal switch right turn Below 1 Ω
      13 (TR) - 12 (EL)
      13 (TR) - 12 (EL) Turn signal switch right lane change Below 1 Ω
      14 (CR) - 12 (EL) Turn signal switch neutral 10 kΩ or higher
      13 (TR) - 12 (EL)
      15 (TL) - 12 (EL)
      15 (TL) - 12 (EL) Turn signal switch left lane change Below 1 Ω
      14 (CR) - 12 (EL) Turn signal switch left turn Below 1 Ω
      15 (TL) - 12 (EL)
      Fig 2: Locating Low Beam And Hi Beam Position
      G05782975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value (s) in the table below

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      4 (BFOG) - 3 (LFOG) Front fog light switch OFF 10 kΩ or higher
      4 (BFOG) - 3 (LFOG) Front fog light switch ON Below 1 Ω
    5. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      2 (B) - 4 (BFOG) Rear fog light switch OFF 10 kΩ or higher
      2 (B) - 3 (LFOG)
      2 (B) - 4 (BFOG) Rear fog light switch ON Below 1 Ω
      2 (B) - 3 (LFOG)

      If the result is not as specified, there may be a malfunction on the switch.

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