The rails might be down because it's not fully powered on to conserve the battery life. You would want it in the car and supposedly in a working mode for that test. If you tie the logic line to ENABLED with a 1k resistor as a test does the unit start performing correctly?
Don't know....and can't do any more tests on it because when I got the new module they took the old one because new module was an "replacement part".
So, maybe someone else, who has the problem and more time than I did, can try that.