Methods for aiming a headlamp assembly of a vehicle having an aiming bracket and a sensor coupled to the aiming bracket. The method includes adjusting the aiming bracket such that an optical axis of the optical assembly inside of the headlamp assembly is parallel to a predetermined axis). The method further includes storing an output of the sensor when the optical axis is parallel to the predetermined axis. The method further includes installing the headlamp assembly into the vehicle. The method further includes adjusting the aiming bracket such that the output of the sensor equals the stored output.