Capture all requirements for mechatronic systems in the automotive industry is a chal-lenge in the early stages of development. This is exacerbated under the current conditions, such as reduced development time, cost-effective development and the latest technolo-gies. In order to record all relevant requirements for these interdisciplinary and complex systems, a consistent process model for the requirements elicitation is required.To cover all relevant aspects of such a process model, the development in the automotive industry is examined and the specific challenges are derived. On this basis, the required partial outcomes for requirement elicitation are identified and embedded in a consistent process model. Based on a method to identify the relevant system-features, the functions, properties, system structure and the interfaces of the system are gathered. With these par-tial outcomes all needed requirements can be derived and documented in a specification sheet. The process model offers methods for the verification of the partial outcomes. In addition, a procedure for documenting lessons learned has been defined in order to inte-grate findings from later phases of development into the requirement elicitation of future systems. The developed process model has been used in a wide range of development projects. In the presented work the validation is based on the examples fuel cell, thermo-electric generator and digital matrix light.