In the context of the digitalization of the construction sector, we participate in the introduction and further development of Building Information Modeling (BIM) for the building automation and the facility management sectors. In particular, we focus on the use of BIM for the digital description of functions and the automated commissioning of building systems. We also integrate BIM information with fault diagnostics methods to provide building operators with contextual information for an easy understanding of the root causes in case a fault is detected on a system.