A simulation tool includes a printed circuit board assembly or PCBA having a built-in USB communication port and a microcontroller. A host computer transmits user-selected configuration data to the microcontroller, which transforms the data into solid-state signals. These are provided to a power master module in an electrical bench or a test vehicle. A method of simulating a low-current ignition switch that is usable with the PMM includes transmitting user-selectable configuration data from a host computer to a PCBA having a microcontroller, transforming the configuration data into a set of solid-state signals simulating a desired set of power mode parameters, and transmitting the solid-state signals to the PMM to thereby simulate an operation of the low-current ignition switch.