ECU Power Source Circuit [09/2014 - 11/2017]: Procedure

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

   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 AND BODY GROUND)