I am at present facilitating workshops for Systems FMEAs on a new car platform. The approach I have taken is to treat each component/sub-system as a black box and try to concentrate on the system interactions.
Historically, people (okay engineers!) are good at doing their thing, but are not good at communication to others.
SFMEA makes them consider how their product affects the entire system as a whole and like a
DFMEA can look at potential failures, effect, and possible design controls.
If anyone has any other comments or viewpoints I would be glad to hear them.