Inspection Procedure

NOTE:

Turn the engine switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

CHECK OPEN IN CAN NO. 1 BUS WIRE (GATEWAY ECU BRANCH WIRE)

Turn the engine switch off.
Disconnect gateway ECU connector E25.

Fig 1: Identifying Gateway ECU Connector E25
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Value
E25-16 (CA1H) - E25-15 (CA1L)	Engine switch on (IG)	54 to 69 Ω

NG: REPAIR OR REPLACE CAN NO. 1 BUS BRANCH WIRE OR CONNECTOR (GATEWAY ECU)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BATT, IG1, IG2, GND)

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

Fig 2: Identifying Gateway ECU Connector E25

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Value
E25-4 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

VOLTAGE SPECIFICATION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE GATEWAY ECU