Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN BUS LINE FOR DISCONNECTION

Disconnect the G3 gateway ECU connector.

Fig 1: Identifying G3 Gateway ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
G3-17 (CA1H) - G3-18 (CA1L)	Ignition switch OFF	54 to 69 Ω

NG: REPAIR OR REPLACE GATEWAY ECU SUB BUS LINE AND CONNECTOR

OK: Go to Next step

CHECK WIRE HARNESS (GATEWAY ECU - BATTERY AND BODY GROUND)

Disconnect the G3 gateway ECU connector.

Fig 2: Identifying G3 Gateway ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
G3-24 (GND) - Body ground	Always	Below 1 Ω

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
G3-10 (BATT) - Body ground	Always	10 to 14 V
G3-2 (ACC) - Body ground	Ignition switch ACC	10 to 14 V
G3-1 (IG) - Body ground	Ignition switch ON	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE GATEWAY ECU