Install the headlight assembly with the headlight bracket pin.

Install a new headlight gasket.

Prepare the vehicle:

Remove the headlight socket cover as shown in the illustration.

Using a clip remover, remove the 11 clips and cool air intake duct seal.

Lexus IS250 IS220d GSE20 ALE20 LIGHTING

The AFS OFF switch uses the multiplex communication system. First make sure that the multiplex communication system is functioning normally before performing troubleshooting on the AFS OFF switch.

This circuit detects the state of the engine switch. The AFS ECU receives it from the engine switch.

The turning on and off of the door mirror foot lights is controlled by the main body LH based on various signals received through BEAN communication.

The main body ECU LH includes a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor) circuit that fades the door mirror foot lights in and out by duty control.

The main body ECU RH receives information regarding the door lock position switches, door courtesy switches, and engine switch, and turns on each footwell light.

This illumination setting can be canceled using the light control rheostat.