Modern development processes put architecture and design models in the center of system engineering activities. With the increasing application of software (SW) controlled functions such development processes have obtained a high significance in the automotive industry too. In addition, functional safety standards such as ISO 26262  issued by International Standardization Organization (ISO) require safety analysis procedures to be tightly integrated with these engineering activities. The authors show a solution to tackle the need for such integration by using architecture and design models as a single source of information for functional safety analysis activities and methods. Moreover, a seamless round-trip approach between the activities of the system design, the requirements engineering and the functional safety analysis activities is presented.