Remove the 4 bolts and the front lower suspension member protector.

Lexus IS250 IS220d GSE20 ALE20 POWER STEERING

Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system.

The power steering ECU is connected to the combination meter via CAN and multiplex communications. If any of the following are detected, the PS warning light remains on.

The power steering ECU assembly receives signals from the ECM, skid control ECU, and steering control ECU via CAN communication.

The power steering ECU assembly receives signals from the ECM, skid control ECU, and steering control ECU via CAN communication.

The power steering ECU assembly outputs this DTC when it determines that the assist map is not written in the ECU.

This circuit supplies power to drive the power steering motor.

If the power steering ECU assembly determines that there is a malfunction in the IG circuit inside the ECU, it outputs this DTC. This DTC is not output when there is an open circuit in the wire harness connected to terminal IG or a battery voltage drop.

The power steering ECU assembly receives vehicle speed signals from the skid control ECU via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals.

If the ECU detects this DTC, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control.