Wiper Signal Circuit: Procedure

1. Disconnect the driving support ECU connector.
   Fig 1: Inspecting Driving Support ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the power switch on (IG).
3. Set the windshield wiper switch assembly to the HI position.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L60-32 (WIP2) - Body ground	Power switch on (IG) Windshield wiper switch assembly Hi position	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

5. Reconnect the driving support ECU connector.

NG → See step   2 

OK → See step   3 

1. Disconnect the driving support ECU connector.
2. Disconnect the windshield wiper switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   L60-32 (WIP2) - L48-4 (+2)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   L60-32 (WIP2) or L48-4 (+2) - Body ground	Always	10 kΩ or higher

4. Reconnect the driving support ECU connector.
5. Reconnect the windshield wiper switch assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT CONTROL ECU - WINDSHIELD WIPER SWITCH) 

OK → See step   4