Multiplex systems are integrated current-distribution and vehicle-information systems for commercial vehicles serving to control and diagnose the electrical consumers. They consist of body computer, frame computer, I/O modules and effi cient software. With their CAN-bus-based architecture, they simplify complex wiring harnesses and reduce the number of solenoids and fuses. In designing systems for specific vehicles, we work closely with our customers and with the suppliers of the wiring harnesses.