In thisfunctional model of an original electromechanical power steering the componentsare exposed within the steering housing in order to demonstrate for example theoperation of the double drive pinion. Because of the extremely high forces onall moving parts and rotating the open areas were fitted with transparentcovers for safety. More represent able functions are active reset in thedirectional stability as well as the controlled demand for power consumptionfor reduction in fuel consumption. The communication between the controlunit for steering column electronics, the diagnostic interface (gateway) andthe Diagnostic Interface (OBD) is done via CAN Bus. Steering angle, powerconsumption and torque can be tested and measured using standard workshop diagnosticsystems via the OBD interface. In order to increase the steering forcespartially, a resistance pressure box is mounted. Thus, the required effort withand without assistance can be represented visually. The system has a controlpanel with emergency stop switch, ignition switch, indicator light and OBDinterface. The power supply is provided by a vehicle battery. Optional errorcircuit 6 switches / 12 errors and associated test sockets in 4mm design.