Automotive OEMs and suppliers face growing challenges in developing automated and connected driving functions, due to complex software-hardware integration and deep, data-driven supply chains. Efficient, traceable data exchange is crucial. GAIA-X 4 PLC-AAD leverages open, distributed data ecosystems to enable secure, regulated data sharing across the entire product lifecycle, from design to continuous virtual validation. By defining information models, data architectures and processes, the project enhances trust, interoperability and efficiency. Test environments for automated driving functions and sensors are integrated, with interfaces ensuring broader applicability across industries. We will present results from GAIA-X 4 PLC-AAD, a project funded by the German Ministry for Economic Affairs and Climate Action (BMWK), which concluded in March 2025.