ZD-SignalGenerator3 is a specialized environment bus signal generator developed for the needs of the automotive industry. The hardware supports multiple standard automotive bus systems, including CAN/CAN FD, LIN, Ethernet, and FlexRay. Through customized processes, it simulates background signals and meets all the requirements of the tested control unit on test benches. In conjunction with SignalGen Lite, ZD-SignalGenerator3 simplifies the testing processes and eliminates the need of additional computers and complex client software. Simple control and monitoring of the signals, such as adjusting the speed signal or activating the ignition signal, can be performed manually via the versatile GPIO interfaces of SignalGen Lite, such as buttons, switches, and LEDs. SignalGen Lite can also be used as a standalone CAN signal generator.