1. A method performed by a computer for generating a code from a reference model for use in an electronic control unit for vehicles, the method comprising: providing the reference model to a first computer; creating an intermediate language model from which code is generated, wherein the first computer generates the intermediate language model based on the reference model, wherein the intermediate language model implements the behavior of the reference model, wherein a first plurality of predetermined parameters and information in the intermediate language model is visible and modifiable and provided to a display, and a second plurality of predetermined parameters and information in the intermediate language model is obscured; storing the intermediate language model on a storage medium; providing the intermediate language model to a display on a second computer that is different from the first computer; adapting, using the second computer, the intermediate language model based on the first plurality of predetermined parameters and information to generate a code tailored for use in the electronic control unit for vehicles; storing the adapted intermediate language model on a storage medium; and generating, using the second computer, the code based on the adapted intermediate language model, and storing the code on a storage medium, wherein a source code of the generated code has a fourth plurality and a fifth plurality of predetermined parameters and information, wherein the fourth plurality of predetermined parameters and information is visible and modifiable, and wherein the fifth plurality of predetermined parameters and information is obscured.
7. The method for generating a code according to claim 1 , wherein the intermediate language model is inserted into a simulation model, and wherein the intermediate language model is simulated together with the simulation model.