Wiper ECU Power Source Circuit: Procedure

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BATTERY AND BODY GROUND)

Disconnect the H75 windshield wiper relay assembly connector.

Fig 1: Identifying H75 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Condition	Specified Condition
H75-12 (IG) - Body ground	Power switch on (IG)	11 to 14 V
H75-23 (WIG) - Body ground	Power switch on (IG)	11 to 14 V

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H75-26 (E) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Windshield Wiper Relay Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 2

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE