Wiper and Washer Switch Circuit: Procedure

1. Remove the windshield wiper switch assembly. Refer to REMOVAL .
   Fig 1: Inspecting Windshield Wiper Switch Assembly With D23 & D25 Connector End View

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

   Standard Resistance

   Front Wiper Switch 

   Front Washer Switch 

   Adjusting Ring*1 

   Tester Connection	Switch Condition	Specified Condition
   D23-3 (+1) - D23-1 (+S)	OFF	Below 1 Ω
   D23-3 (+1) - D23-2 (+B)	MIST
   	LO
   D23-2 (+B) - D23-4 (+2)	HI
   D23-9 (AUTO) - D23-10 (E)	AUTO
   D23-3 (+1) - D23-1 (+S)

   Tester Connection	Switch Condition	Specified Condition
   D25-2 (EW) - D25-3 (WF)	ON	Below 1 Ω
   	OFF	10 kΩ or higher

   Tester Connection	Condition	Specified Condition
   D23-7 (VR1) - D23-8 (VR2)	Adjusting ring changed from (+) side to (-) side	0 to 2.7 kΩ

   HINT: 

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

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   3 

OK: Go to next step 

1. Disconnect the D23 and D25 windshield wiper switch assembly connectors.
   Fig 2: Checking Harness And Connector (Wiper Switch - Wiper Relay And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Front view of wire harness connector (to Windshield Wiper Switch Assembly)

   *b

   Front view of wire harness connector (to Windshield Wiper Relay Assembly)

2. Disconnect the D78 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
   D23-3 (+1) - D78-1 (+2S)	Always	Below 1 Ω
   D23-3 (+1) - Body ground	Always	10 kΩ or higher
   D23-4 (+2) - D78-3 (+2)	Always	Below 1 Ω
   D23-4 (+2) - Body ground	Always	10 kΩ or higher
   D23-1 (+S) - D78-11 (+SSW)	Always	Below 1 Ω
   D23-1 (+S) - Body ground	Always	10 kΩ or higher
   D23-9 (AUTO) - D78-17 (C1)	Always	Below 1 Ω
   D23-9 (AUTO) - Body ground	Always	10 kΩ or higher
   D23-10 (E) - D78-16 (C0)	Always	Below 1 Ω
   D23-10 (E) - Body ground	Always	10 kΩ or higher
   D23-7 (VR1) - D78-7 (VR1)	Always	Below 1 Ω
   D23-7 (VR1) - Body ground	Always	10 kΩ or higher
   D23-8 (VR2) - D78-6 (VR2)	Always	Below 1 Ω
   D23-8 (VR2) - Body ground	Always	10 kΩ or higher
   D25-2 (EW) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4