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Home >> Lexus >> 2022 >> RX 450hL >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Service Information) (2 Of 2) >> Headlight Dimmer Switch >> Inspection [08/2019 - 07/2020] >> Procedure

Inspection [08/2019 - 07/2020]: Procedure

  1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY679064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Headlight Dimmer Switch Assembly)

      Standard Resistance

      LIGHT CONTROL SWITCH

      Tester Connection Condition Specified Condition
      18 (T) - 15 (EL) Light control switch off *1 or DRL OFF*2 10 kΩ or higher
      19 (H) - 15 (EL) Light control switch off *1 or DRL OFF*2 10 kΩ or higher
      20 (A) - 15 (EL) Light control switch off *1 or DRL OFF*2 10 kΩ or higher
      18 (T) - 15 (EL) Light control switch in tail position Below 1 Ω
      18 (T) - 15 (EL) Light control switch in head position Below 1 Ω
      19 (H) - 15 (EL) Light control switch in head position Below 1 Ω
      20 (A) - 15 (EL) Light control switch in AUTO position Below 1 Ω
      DIMMER SWITCH

      Tester Connection Condition Specified Condition
      16 (HL) - 15 (EL) Dimmer switch in low position Below 1 Ω
      14 (HU) - 15 (EL) Dimmer switch in high or high flash position Below 1 Ω
      17 (HF) - 15 (EL) Dimmer switch in high flash position Below 1 Ω
      TURN SIGNAL SWITCH

      Tester Connection Condition Specified Condition
      12 (TR) - 15 (EL) Turn signal switch in neutral position 10 kΩ or higher
      11 (TL) - 15 (EL) Turn signal switch in neutral position 10 kΩ or higher
      13 (CR) - 15 (EL) Turn signal switch in neutral position 10 kΩ or higher
      12 (TR) - 15 (EL) Turn signal switch in right turn position Below 1 Ω
      13 (CR) - 15 (EL) Turn signal switch in full right turn position Below 1 Ω
      11 (TL) - 15 (EL) Turn signal switch in left turn position Below 1 Ω
      13 (CR) - 15 (EL) Turn signal switch in full left turn position Below 1 Ω
      FOG LIGHT SWITCH *3

      Tester Connection Condition Specified Condition
      8 (LFG) - 9 (BFG) Fog light switch off 10 kΩ or higher
      8 (LFG) - 9 (BFG) Fog light switch in front position Below 1 Ω
      1. *1: w/o DRL OFF Switch
      2. *2: w/ DRL OFF Switch
      3. *3: w/ Fog Light

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