Hardware in the Loop (HiL) tests are rightly considered today as a key component in validating fully integrated ECUs. With the aid of Hardware in the Loop, individual parts of an integrated system can be simulated and tested in a virtual environment in real time. SET GmbH has specialized on HiL for a number of years and was thus named the Hardware in the Loop Specialty Partner by National Instruments. HiL simulation allows for an efficient assessment of systems while reducing testing time and costs and increasing reliability by replacing complex, real tests. In regard to ADAS sensor fusion, the complexity lies in integrating target simulators, classic analogue, and digital signals possibly including signal conditioning, control and evaluation of vehicle busses CAN and FlexRay, as well as the consideration of a car model. The HiL environment guarantees the parallel execution of all individual components in real time.