Inspection Procedure

1. Check that the windshield wiper switch can operate the wipers.

   OK: 

   Windshield wiper switch can operate wipers normally. 

OK: REPLACE COMBINATION SWITCH (WINDSHIELD WIPER SWITCH) 

NG: GO TO Next Step 

1. Disconnect the K22 combination switch connector.
2. Measure the resistance and voltage of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K22-5 (E) - Body ground	Below 1 Ω

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K22 - 1 (B) - Body ground	10 to 14 V

   Fig 1: Identifying K22 Windshield Wiper Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO Next Step 

Fig 2: Identifying K22 Switch, K68 ECU And 1X Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K22 switch connector.
2. Disconnect the K68 ECU connector.
3. Disconnect the 1X junction block connector.
4. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K22-6 (MPX1) - K68-21 (MPX2)	Below 1 Ω
   K22-7 (MPX2) - 1X-5	Below 1 Ω

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B: REPAIR OR REPLACE WINDSHIELD WIPER SWITCH AND WIRE HARNESS OR CONNECTOR 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

A: REPLACE COMBINATION SWITCH (WINDSHIELD WIPER SWITCH)