ECU Power Source Circuit: Procedure

1. Remove the ECU-IG No. 1 fuse from the cowl side junction block LH.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   ECU-IG No. 1 fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the E89 and E90 windshield wiper ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E89-5 (IG1I) - Body ground	Engine switch on (IG)	11 to 14 V
   E89-5 (IG1I) - 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
   E90-10 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3