Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Turn the engine switch off before measuring the resistances of CAN bus main wire 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 (SKID CONTROL ECU BRANCH WIRE)

Turn the engine switch off.
Disconnect the skid control ECU connector.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Value
A36-11 (CANH) - A36-25 (CANL)	Engine switch off	54 to 69 Ω

Fig 1: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to Next Step

CHECK WIRE HARNESS (IG1, GND1, GND2)

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Value
A36-32 (GND1) - Body ground	Always	Below 1 Ω
A36-1 (GND2) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Skid Control ECU Connector Terminals

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Value
A36-46 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE BRAKE ACTUATOR (See REMOVAL )