Headlight Dimmer Switch: Inspection

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

Measure the resistance of the switch.

Fig 1: Identifying Headlight Dimmer Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance:

Light control switch

LIGHT CONTROL SWITCH

Tester Connection	Switch Condition	Specified Condition
12 (EL) - 18 (T)	OFF	10 kΩ or higher
12 (EL) - 19 (A)	OFF	10 kΩ or higher
12 (EL) - 20 (H)	OFF	10 kΩ or higher
12 (EL) - 18 (T)	TAIL	Below 1 Ω
12 (EL) - 20 (H)	HEAD	Below 1 Ω
12 (EL) - 18 (T)	HEAD	Below 1 Ω
12 (EL) - 19 (A)	AUTO	Below 1 Ω

Headlight dimmer switch

HEADLIGHT DIMMER SWITCH

Tester Connection	Switch Condition	Specified Condition
12 (EL) - 11 (HU)	FLASH	Below 1 Ω
12 (EL) - 16 (HL)	FLASH	Below 1 Ω
12 (EL) - 16 (HL)	LO BEAM	Below 1 Ω
I2 (EL) - 11 (HU)	HI BEAM	Below 1 Ω

Turn signal switch

TURN SIGNAL SWITCH

Tester Connection	Switch Condition	Specified Condition
12 (EL) - 13 (TR)	Right turn	Below 1 Ω
12 (EL) - 15 (TL)	Neutral	10 kΩ or higher
12 (EL) - 13 (TR)	Neutral	10 kΩ or higher
12 (EL) - 15 (TL)	Left turn	Below 1 Ω

Fog light switch

FOG LIGHT SWITCH

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 dimmer switch assembly.