The new and modern hardware-in-the-loop test system μLC Test System is suitable for mobile application, measuring a compact 17 cm x 11 cm x 6 cm. Initial test setup typically takes under ten minutes, since the system allows for a simple test setup. It is a compact open-loop test system for quality assurance of control unit development and combines the simulation of all typical automotive sensors and communication protocols in one unit. Its interface is user-friendly and enables an easy operation and evaluation. The μLC Test System is especially used for automotive control units with typical interfaces for sensors and bus systems such as analogue/digital inputs and outputs, PWM signals, SENT, CAN, LIN and speed sensors