Wiper Signal Circuit [09/2014 - 11/2017]: Procedure

1. Check that the wiper and washer system operates normally.

   OK

   Wiper and washer system operates normally

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO WIPER AND WASHER SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 03/2019] 

Result: 

OK 

See step  2

1. Disconnect the Q1 driving support ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Driving Support ECU Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Q1-30 (B) - Body ground	Engine switch on (IG)	11 to 14 V
   Q1-30 (B) - Body ground	Engine switch off	Below 1 V
   Q1-32 (WIP2) - Body ground	Engine switch on (IG), windshield wiper switch Hi	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-25 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - 11/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BATTERY, BODY GROUND AND WINDSHIELD WIPER SWITCH ASSEMBLY)