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In this paper, we present a tool enhancement that allows an effective transition from the system level development phase to the software level development phase of a tool-supported safety engineering workflow aligned with the automotive functional safety standard ISO 26262. The tool enhancement has capabilities for model generation and code generation. Whereas the generation of Simulink models supports the development of application software, the configuration and generation of safety drivers supports the development of the basic software required for initialization, runtime fault detection and error handling. We describe the safety engineering workflow and its supporting tool chain including the tool enhancement. Moreover we demonstrate that the enhancement supports the transition from the system level development phase to the software level development phase using the case study of a hybrid electric vehicle development.