This is a Light position controller circuit. Light position controller is a monolithic integrated circuit which is used in passenger cars. Potentiometer on the dashboard is used to define the light beam’s elevation of the head light of the car to a state by the car driver. Here is the circuit:

TDA3629 Light position controller circuit schematic

This circuit has some features, they are Thermally protected, Low supply current, Low positional error and Low noise sensitivity due to hysteresis. besides that this circuit has Brake function by short-circuiting the motor, Broken wire and short-circuit indication on SET input and the Hysteresis level set externally. [Source: NXP Application Note]