ECU Power Source Circuit: Procedure

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - BATTERY AND BODY GROUND)

NOTE:

A DTC is stored when the following inspection is performed. Be sure to clear the DTC after performing this inspection.

Disconnect the G43 driving support ECU connector.

Fig 1: Identifying G43 Driving Support ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
G43-30 (B) - Body ground	Engine switch on (IG)	11 to 14 V
G43-30 (B) - Body ground	Engine switch off	Below 1 V

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G43-25 (GND) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

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

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