Using a moulding remover, disengage the 5 claws and 3 clips, and then remove the side instrument panel LH.

Lexus IS250 IS220d GSE20 ALE20 STEERING COLUMN

This circuit supplies power source voltage from the battery to terminal B of the steering lock ECU. This is used as power source for the CPU, motor, communication, and peripheral circuits.

The unlock position sensor is one of the components comprising the steering lock actuator. The sensor switch contact closes when the steering lock is released. The steering lock release signal is then sent to the power source control ECU. Receiving the signal, the ECU permits engine start. (This prevents the engine from being started with the steering locked.)

The steering lock ECU is connected to the power source control ECU and certification ECU. The steering lock ECU cannot activate the motor unless it receives permission signals from both the ECUs. (The power source control ECU permits the steering lock ECU to supply power to activate the motor.)

The power source control ECU controls the power supply to activate the steering lock motor. This prevents the steering from being locked while the vehicle is moving.

The steering lock ECU receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU equals to the voltage that is applied to the steering lock ECU, the steering will be unlocked. The steering lock ECU will not lock the steering when power from the IG2 relay is present (this prevents the steering from being locked while the vehicle is moving).

If the steering lock ECU determines that there is a malfunction inside the ECU, it outputs this DTC. Diagnostic communication between the steering lock ECU and the intelligent tester is performed via the certification ECU as the steering lock ECU is not connected to the BEAN.

If a trouble code is displayed during the DTC check, check the parts listed for that code in the table below and proceed to the appropriate page.

Connect the intelligent tester to the DLC3.