Wiper and Washer Switch Circuit: Procedure

1. Remove the windshield wiper switch assembly. Refer to REMOVAL [06/2012 - ] .
   Fig 1: Measuring Resistance Of Windshield Wiper Switch Assembly (W/ Auto Wiper System)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   FRONT WIPER SWITCH
   
   

   Tester Connection	Condition	Specified Condition
   H25-3 (+1) - H25-1 (+S)	OFF	Below 1 Ω
   	AUTO
   H25-3 (+1) - H25-2 (+B)	MIST
   	LO
   H25-2 (+B) - H25-4 (+2)	HI
   H25-8 (AUTO) - H25-9 (E)	AUTO

   FRONT WASHER SWITCH
   
   

   Tester Connection	Condition	Specified Condition
   H24-4 (EW) - H24-7 (WF)	ON	Below 1 Ω
   	OFF	10 kΩ or higher

   ADJUSTING LEVER*
   
   

   Tester Connection	Condition	Specified Condition
   H25-7 (VR1) - H25-6 (VR2)	P1	209 to 231 Ω
   	P2	114 to 126 Ω
   	P3	58.9 to 65.1 Ω
   	P4	Below 1 Ω

   HINT: 

   *: The rain sensor sensitivity can be adjusted by the windshield wiper switch assembly adjusting lever.

   TEXT IN ILLUSTRATION
   
   

   *1	Windshield Wiper Switch Assembly (Adjusting lever Position)
   *a	Component without harness connected (Windshield Wiper Switch Assembly)

NG → See step   3 

OK: Go to next step 

1. Disconnect the H51 windshield wiper relay assembly connector.
2. Disconnect the A25 windshield wiper motor assembly.
3. Disconnect the 3A instrument panel junction block assembly.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H24-4 (EW) - Body ground	Always	Below 1 Ω
   H24-7 (WF) - H51-25 (W)	Always	Below 1 Ω
   H24-7 (WF) - Body ground	Always	10 kΩ or higher
   H25-1 (+S) - H51-10 (+1)	Always	Below 1 Ω
   H25-1 (+S) - Body ground	Always	10 kΩ or higher
   H25-2 (+B) - 3A-11	Always	Below 1 Ω
   H25-2 (+B) - Body ground	Always	10 kΩ or higher
   H25-3 (+1) - A25-5 (+1)	Always	Below 1 Ω
   H25-3 (+1) - Body ground	Always	10 kΩ or higher
   H25-4 (+2) - H51-11 (+2)	Always	Below 1 Ω
   H25-4 (+2) - A25-3 (+2)	Always	Below 1 Ω
   H25-4 (+2) - Body ground	Always	10 kΩ or higher
   H25-6 (VR2) - H51-8 (VR2)	Always	Below 1 Ω
   H25-6 (VR2) - Body ground	Always	10 kΩ or higher
   H25-7 (VR1) - H51-21 (VR1)	Always	Below 1 Ω
   H25-7 (VR1) - Body ground	Always	10 kΩ or higher
   H25-8 (AUTO) - H51-3 (C1)	Always	Below 1 Ω
   H25-8 (AUTO) - Body ground	Always	10 kΩ or higher
   H25-9 (E) - H51-5 (CO)	Always	Below 1 Ω
   H25-9 (E) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4