Wiper and Washer Switch Circuit: Procedure

1. Remove the windshield wiper switch assembly. Refer to COMPONENTS .
   Fig 1: Identifying Windshield Wiper Switch Assembly

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

   Standard Resistance

   Front Washer Switch 

   Adjusting Ring*1 

   FRONT WIPER SWITCH
   
   

   Tester Connection	Switch Condition	Specified Condition
   F28-3 (+1) - F28-1 (+S)	OFF	Below 1 Ω
   F28-3 (+1) - F28-2 (+B)	MIST
   	LO
   F28-2 (+B) - F28-4 (+2)	HI
   F28-9 (AUTO) - F28-1 (+S)	AUTO

   Tester Connection	Switch Condition	Specified Condition
   F27-2 (EW) - F27-3 (WF)	ON	Below 1 Ω
   	OFF	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   F28-7 (VR1) - F28-8 (VR2)	Adjusting ring changed from (+) side to (-) side	0 to 2.7 kΩ

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Windshield Wiper Switch Assembly)

   HINT: 

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

NG → See step   3 

OK: Go to next step 

1. Disconnect the F27 and F28 windshield wiper switch assembly connectors.
2. Disconnect the F101 windshield wiper relay assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F28-2 (+B) - F101-12 (IG)	Always	Below 1 Ω
   F28-2 (+B) - Body ground	Always	10 kΩ or higher
   F28-3 (+1) - F101-1 (+2S)	Always	Below 1 Ω
   F28-3 (+1) - Body ground	Always	10 kΩ or higher
   F28-4 (+2) - F101-3 (+2)	Always	Below 1 Ω
   F28-4 (+2) - Body ground	Always	10 kΩ or higher
   F28-1 (+S) - F101-11 (+SSW)	Always	Below 1 Ω
   F28-1 (+S) - Body ground	Always	10 kΩ or higher
   F28-9 (AUTO) - F101-17 (C1)	Always	Below 1 Ω
   F28-9 (AUTO) - Body ground	Always	10 kΩ or higher
   F28-10 (E) - F101-16 (CO)	Always	Below 1 Ω
   F28-10 (E) - Body ground	Always	10 kΩ or higher
   F28-7 (VR1) - F101-7 (VR1)	Always	Below 1 Ω
   F28-7 (VR1) - Body ground	Always	10 kΩ or higher
   F28-8 (VR2) - F101-6 (VR2)	Always	Below 1 Ω
   F28-8 (VR2) - Body ground	Always	10 kΩ or higher
   F27-3 (WF) - F101-4 (W)	Always	Below 1 Ω
   F27-3 (WF) - Body ground	Always	10 kΩ or higher
   F27-2 (EW) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4