Automatic Headlight Beam Level Control: Actuator
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Based on the signals received from the headlight beam level control ECU, each actuator moves the reflector in the headlight to vary it's beam. This actuator uses a step motor to precisely regulate the angle of the reflector.