Inspection Procedure

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

   OK: 

   Windshield wiper switch can operate wipers normally. 

NG : Go to step 2 

OK : REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY 

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

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

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

   Standard Voltage 

   VOLTAGE SPECIFIED CONDITIONS
   
   

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

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Identifying K22 Combination Switch Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step 

Fig 2: Identifying K22 Switch With K68 And 2F ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K22 switch connector.
2. Disconnect the K68 and 2F ECU connectors.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K22-6 (MPX1) - K68-21 (MPX2)	Below 1 Ω
   K22-7 (MPX2) - 2F-5 (MPX1)	Below 1 Ω

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   All are OK	A
   One or two is / are OK	B
   All are NG	C

B : REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY AND WIRE HARNESS CONNECTOR 

C : REPAIR OR REPLACE HARNESS AND CONNECTOR 

A : REPLACE COMBINATION SWITCH ASSEMBLY (WINDSHIELD WIPER SWITCH ASSEMBLY)