Automotive “Exterior Lighting” systems are subject to stringent regulatory requirements and vehicle manufactures internal standards to meet the functional and aesthetic requirement of various vehicle classes. Exterior Lighting systems have grown increasingly due to complexity in design to meet customer demands. Traditionally, validation of lighting system is dependent on physical testing and associated vehicle hardware, particularly Body Control System (BCM). This traditional approach presents several challenges, including dependency on mature vehicle hardware and software, difficulties in integration testing and synchronization across various lamps, and this may compromised design validation quality. To address these challenges, this paper proposes a novel approach leveraging digital simulation of lamps validation methodology through a real time hardware simulation system. Enabling independent testing and validation of exterior lighting systems in a controlled virtual environment. The digital simulation approach allows for the early and flexible assessment of lamp functionality without direct reliance on physical vehicle components, hardware and software maturity. With simulating lighting system interactions within a virtual environment, has several key benefits, including enhanced flexibility in testing, improved integration validation, and superior design validation quality. This paper details the methodology for implementing digital simulation using Real time hardware simulation technology, ultimately addressing the limitations of traditional testing methods.