A intelligent grafical user interface helps to map each wire of the cable or a complex wiring harness. The System itself creates the necessary test cases and store that for future use. This stored test description can be carried out in end-of-line test or for Investigation purposes. The System is able to handle TVS-diodes or other protection dioes up to 53V protection voltage, which are built in cable. sWHT250 System creates suitable Tests for those diodes.