This paper describes the basic elements of the electrical installation of a passenger car, with special emphasis on signals on the CAN bus. The historical development of electronics inside the vehicle is briefly described, as well as the form of signals and message topology, and the medium used for their transmission. Special attention is given to the types of sensors with characteristic examples for electrical and non-electrical signals. The characteristics of the Raspberry Pi development platform and its applications in electronic installations are described, as well as the software development steps, characteristics of the developed version and possible upgrades. The results obtained by connecting the Raspberry Pi microcomputer to the CAN bus are processed in such a way that CAN messages are filtered based on addresses and contents within the data fields, and are stored in variables that are later called in the graphical interface. Finally, the result is a control panel for displaying information with the minimum number of wires required for creating an electrical installation.