Saturn Hybrid Test Possible?

Code is U 0120- lost communication with Starter/Generator-
Question still is, can this module be tested by itself, dealership or tech joint. Say I bought one from a junk yard, could it be tested with out having to hook it up to a car to get input? Is there a procedure, a testing device that would be implemented to see if the module is any good before installing it?

Thank you very much for the replies- I certainly do agree- this car is not for the do it yourselfers nor most regular mechanics-I already had the car in to the dealer after plying with it as much as I could- Dealer gave me an estimate of $83 to diagnose the code U 0120- After they started looking at it they called to say they needed another hour at $160 because tech was having trouble and needed to call Saturn- (dealer is mainly a Chevrolet but they are an authorized Saturn dealer) Long story short, module is bad, 6 days to get part and $1100 bill- Saturntech9, you explanation of the testing procedure somewhat justifies the long diagnostic process but Saturn had no business dumping this experimental turd on the consumer market- Hard lesson for my daughter to learn on her first car buying venture- In a perfect world the creep used car salesperson that unloaded it on her would have to put his own family in it.
Ant way, thank you all for the answers and this very helpful site-

Saturntech9- thanks for the tip on what to avoid- Can't even imagine the complexity of ev 1- I love the idea of electric cars but maybe not until they get them past the Apollo 13
stage-