I think something is not connected. *possible* pcm, sure. but more than likely something is missing.

when I apply a tune to my pcm the DIC flashes while its being written, so at that point I'm sure the DIC is not getting the signal from the pcm.

obviously something is not connected somewhere.

is your aftermarket alarm installed in the car at all right now, or is it totally out. I know some wires run to the ignition switch harness, but I'm not sure if there are any other wires the alarm taps into?

is it possible the alarm not being connected is disrupting something else that only turns on once the alarm is powered on?

just trying to cover all bases here.