Power Source Circuit: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - BATTERY AND BODY GROUND)

Remove the body ECU from instrument panel J/B.

Fig 1: Identifying Instrument Panel J/B Connector Terminal Identification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Resistance

Tester Connection	Condition	Specified Condition
4 (GND2) - Body ground 5 (GND1) - Body ground	Always	Below 1 Ω

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

Voltage

Tester Connection	Condition	Specified Condition
26 (BECU) - Body ground	Always	10 to 14 V
22 (ACC) - Body ground	Ignition switch on (ACC)	10 to 14 V
15 (IG) - Body ground	Ignition switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → PROCEED TO PROBLEM SYMPTOMS TABLE NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE