The evolution of automotive lighting technology has led to the development of advanced headlamp assemblies that integrate multiple functionalities, such as main beams, Daytime Running Lights (DRL), and turn indicators, into compact units. This thesis investigates the modal behavior of automotive headlamps, focusing on the impact of temperature-dependent material properties. The study employs both commercial finite element software and the Carrera Unified Formulation (CUF) to perform comprehensive analyses at three different temperatures. Initially, modal analyses are conducted using commercial software to establish a baseline understanding of the headlamp's dynamic behavior. Subsequently, a detailed CUF-based model is developed to replicate these analyses, ensuring accurate representation of complex geometries and multi-material compositions.