Wiper Switch: Inspection

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

INSPECT WIPER AND WASHER SWITCH ASSEMBLY

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

Standard resistance

Windshield wiper switch

WIPER AND WASHER SWITCH ASSEMBLY

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

Fig 1: Inspecting Windshield Wiper Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Windshield washer switch

WINDSHIELD WASHER SWITCH

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

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

Check the intermittent operation.
1. Connect the voltmeter's positive (+) lead to terminal B-3 (+1) and the negative (-) lead to terminal A-2 (EW).
2. Connect the battery's positive (+) lead to terminal B-2 (+B) and the negative (-) lead to terminals A-2 (EW) and B-1 (+S).
3. Turn the wiper switch to the INT position.
4. Connect the battery's positive (+) lead to terminal B-1 (+S) for 5 seconds.
5. Connect the battery's negative (-) lead to terminal B-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals B-3 (+1) and A-2 (EW).
  
  Fig 2: Checking Intermittent Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Refer to Fig 3 .
  
  Fig 3: Wiper And Washer Switch Intermittent Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the switch assembly.
Check the washer operation.
1. Turn the wiper switch OFF.
2. Connect the battery's positive (+) lead to terminal B-2 (+B) and the negative (-) lead to terminals B-1 (+S) and A-2 (EW).
3. Connect the voltmeter's positive (+) lead to terminal B-3 (+1) and the negative (-) lead to terminal A-2 (EW).
4. Turn the washer switch ON and OFF, and check the voltage between terminals B-3 (+1) and A-2 (EW).
  
  Fig 4: Checking Washer Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Refer to Fig 5 .
  
  Fig 5: Wiper And Wahser Switch Operation Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the switch assembly.