Do you get at least 12V at 1j2 pin 9? What about after it quits?
It needs 12v there otherwise the MPU board goes into a RESET state, and will not come back until 0.5 seconds after 12V is restored.
Also, download my pincoder software and read through the notes for each test. You may find something useful in there as to how things should work. If you want to run some diagnostic tests, there's an adapter available too from the menu at the top.
For now, just check that pin on 1J2 before and after it dies, and let us know what the result is