Headlight Dimmer Switch: Inspection
WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- REMOVE HEADLIGHT DIMMER SWITCH ASSEMBLY
- Measure the resistance according to the value(s) in SPECIFIED CONDITION AND TESTER CONNECTION TABLE .
Standard resistance:
Light Control Switch
SPECIFIED CONDITION AND TESTER CONNECTION TABLETester Connection Switch Condition Specified Condition f1-12 (EL) - f1-18 (T) OFF 10 k ohms or higher f1-18 (T) - f1-19 (AUTO) OFF 10 k ohms or higher f1-19 (AUTO) - f1-20 (H) OFF 10 k ohms or higher f1-12 (EL) - f1-18 (T) TAIL Below 1 ohms f1-12 (EL) - f1-18 (T) HEAD Below 1 ohms f1-18 (T) - f1-20 (H) HEAD Below 1 ohms f1-12 (EL) - f1-19 (AUTO) AUTO Below 1 ohms Headlight Dimmer Switch
SPECIFIED CONDITION AND TESTER CONNECTIONTester Connection Switch Condition Specified Condition f1-11 (HU) - f1-12 (EL) LOW BEAM Below 1 ohms f1-11 (HU) - f1-12 (EL) HI BEAM Below 1 ohms f1-12 (EL) - f1-17 (HF) HI BEAM Below 1 ohms Turn Signal Switch
SPECIFIED CONDITION AND TESTER CONNECTIONTester Connection Switch Condition Specified Condition f1-12 (EL) - f1-13 (TR) Right turn Below 1 ohms f1-12 (EL) - f1-13 (TR) Neutral 10 k ohms or higher f1-12 (EL) - f1-15 (TL) Neutral 10 k ohms or higher f1-12 (EL) - f1-15 (TL) Left turn Below 1 ohms Fog Light Switch
SPECIFIED CONDITION AND TESTER CONNECTIONTester Connection Switch Condition Specified Condition f1-3 (LFG) - f1-4 (BFG) OFF 10 k ohms or higher f1-3 (LFG) - f1-4 (BFG) Fog light switch ON Below 1 ohms Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the result is not as specified, replace the headlight dimmer switch assembly.