An electrical waveform generator for driving an electromechanical load includes a digital signal processor connected to a waveform generator component in turn connected to an amplifier section with a filter network, the latter being connected to sensing and conditioning circuit componentry that is in turn connected to analog-to-digital converter circuitry. The capaciflective sensor senses the presence of objects a predetermined distance from the vehicle port. This final response image dataset displays visual data represents a form particularly useful to the clinician.