Wiper and Washer Switch Circuit: Procedure

1. Check the Data List for proper functioning of the windshield wiper switch. Refer to DATA LIST / ACTIVE TEST [09/2012 - ] .
   COMBINATION SWITCH (WINDSHIELD WIPER SWITCH):
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   Front Wiper OFF Switch	Front wiper OFF switch / ON or OFF	ON: Windshield wiper switch in OFF position OFF: Windshield Wiper switch not in OFF position	-
   F Wiper LO Switch	Front wiper LO switch / ON or OFF	ON: Windshield wiper switch in LO OFF: Windshield wiper switch not in LO	-
   F Wiper HI Switch	Front wiper HI switch / ON or OFF	ON: Windshield wiper switch in HI OFF: Windshield wiper switch not in HI	-
   F Wiper AUTO Switch	Front wiper AUTO switch / ON or OFF	ON: Windshield wiper switch in AUTO OFF: Windshield wiper switch not in AUTO	-
   F Wiper MIST Switch	Front wiper MIST switch / ON or OFF	ON: Windshield wiper switch in MIST OFF: Windshield wiper switch not in MIST	-
   F Washer Switch	Front washer switch / ON or OFF	ON: Washer switch ON OFF: Washer switch OFF	-
   Wiper Volume Position	Front wiper volume (sensitivity) / 0 to 90 degrees	0 degrees / Windshield wiper switch volume "+" position 27 degrees / Windshield wiper switch is turned one notch towards the "-" side from the Windshield wiper switch volume "+" position 63 degrees / Windshield wiper switch is turned one notch towards the "+" side from the Windshield wiper switch volume "-" position 90 degrees / Windshield wiper switch volume "-" position	-
   Ignition Switch	Engine switch signal / ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	"OFF" is also displayed for this item when the engine switch is on (ACC).

   OK

   The display is as specified in the normal condition.

NG → See step   2 

OK → See step   3 

1. Disconnect the L25 switch connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   L25-1 (B) - Body ground	Always	11 to 14 V
   L25-2 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   L25-2 (IG) - Body ground	Engine switch off	Below 1 V

3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L25-8 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4