The AHLS(Auto Headlamp Leveling System) is a device that adjusts the headlamp level automatically depending on loading conditions of the vehicle and driving conditions. It also consists of rotor, stator, PCB(Printed Circuit Board) coil and sensor lever and measures the magnetic field of stator parts by rotation of rotor. The AHLS(Auto Headlamp Leveling System) ECU operates after receiving different parameters from each vehicle.