This study proposes a gradual transition from cabled to wireless communication in vehicles as a means of reducing weight and meeting regulatory requirements related to CO \(_2\) emissions, maintenance costs, and time to market. However, the study recognizes that different network domains and compartments in the vehicle have varying requirements and constraints. Therefore, a hybrid architecture between classical wired and wireless networks using Ultra-Wideband (UWB) was proposed as a starting point for testing the feasibility and obtaining feedback. We selected the Headlamp Control Module (HCM) as an application domain since it represents a reduced network consisting of a microcontroller unit (MCU) that operates as a slave to another electronic control unit (ECU) and sensors. This allowed the study to apply the proposed approach to a representative unit scenario. The study outlines the system architectural description for the selected system, the HCM. It describes the Controller Area Network (CAN) and UWB communication and analyzes the requirements that must be fulfilled to interchange both communication technologies. This paper proposes a CAN-UWB gateway system architecture and simulates it to evaluate its ability to meet communication requirements.