Wiper Switch: Inspection

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

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

Standard resistance:

Front wiper switch

FRONT WIPER SWITCH RESISTANCE TABLE

Tester Connection	Switch Position	Specified Condition
C10-2 (+B) - C10-3 (+1)	MIST	Below 1 Ω
C10-1 (+S) - C10-3 (+1)	OFF	Below 1 Ω
C10-1 (+S) - C10-3 (+1)	INT	Below 1 Ω
C10-2 (+B) - C10-3 (+1)	LO	Below 1 Ω
C10-2 (+B) - C10-4 (+2)	HI	Below 1 Ω

Rear wiper switch (w/ Rear wiper)

REAR WIPER SWITCH RESISTANCE TABLE

Tester Connection	Switch Position	Specified Condition
C9-2 (EW) - C9-6 (C1R), C9-2 (EW) - C9-7 (+1R)	OFF	10 kΩ or higher
C9-2 (EW) - C9-6 (C1R)	INT	Below 1 Ω
C9-2 (EW) - C9-7 (+1R)	ON	Below 1 Ω

Front washer switch

Fig 1: Inspecting Rear Wiper Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

FRONT WASHER SWITCH RESISTANCE TABLE

Tester Connection	Switch Position	Specified Condition
C9-2 (EW) - C9-3 (WF)	OFF	10 kΩ or higher
C9-2 (EW) - C9-3 (WF)	ON	Below 1 Ω

Standard resistance:

Rear washer switch (w/ Rear wiper)

REAR WASHER SWITCH RESISTANCE TABLE

Tester Connection	Switch Position	Specified Condition
C10-5 (WR) - C9-2 (EW), C9-2 (EW) - C9-7 (+1R)	OFF	10 kΩ or higher
C10-5 (WR) - C9-2 (EW)	ON (WASH1)	Below 1 Ω
C10-5 (WR) - C9-2 (EW), C9-2 (EW) - C9-7 (+1R)	ON (WASH2)	Below 1 Ω

Fig 2: Identifying Rear Washer Switch Labels

Intermittent Operation Check
1. Connect the voltmeter positive (+) lead to terminal C9-3 (+1) of the connector and the voltmeter negative (-) lead to terminal C10-2 (EW).
2. Connect the positive battery (+) lead to terminal C9-2 (+B) of the connector and the negative battery (-) lead to terminals C10-2 (EW) and C9-1 (+S).
3. Turn the wiper switch to the INT position.
4. Connect the positive battery (+) lead to terminal C9-1 (+S) of the connector for 5 seconds.
5. Connect the negative battery (-) lead to terminal C9-1 (+S) of the connector. Operate the intermittent wiper relay and measure the voltage between terminals C9-3 (+1) and C10-2 (EW)
  OK : Refer to Fig 3 .
  
  Fig 3: Identifying Intermittent Operation Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front Washer Operation Check
1. Turn the wiper switch to the OFF position.
2. Connect the positive battery (+) lead to terminal C9-2 (+B) of the connector, the negative battery (-) lead to terminals C9-1 (+S) and the terminal C10-2 (EW).
3. Connect the voltmeter positive (+) lead to terminal C9-3 (+1) of the connector and the voltmeter negative (-) lead to terminal C10-2 (EW).
4. Turn the washer switch to the ON and OFF positions, and measure the voltage between terminals C9-3 (+1) and C10-2 (EW).
  OK : Refer to Fig 4 .
  
  Fig 4: Identifying Front Washer Operation Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002