remote start problem, 2000 grand am

I have a 2000 Pontiac Grand Am. I have a Scytek 5100rs installed on my car. Every thing worked ok for a few months, but recently the car will not activate the remote start. I RMA'ed the unit and I just received a new one. It still is acting up. I bought a new DEI 556lw in order to see if that was the problem and to no avail the problem persisted. The problem I have is that will remote start if I auto learn set the DEI bypass unit, but will kill itself within 1 minute. I have reset all the settings to factory on the alarm. In one last desperate attempt I try to install a switch on the yellow passlock data wire. I was told if you cut the wire while the car is running it will disable the passlock. This did not work either. The car will just crank and thats it. So I was wondering if you guys could help. Thank you very much for your time.

seems like a bypass issue.  Make sure you have your tach wire learned on the vehicle and test the wires connecting to the ignition switch.  Make sure they give proper 12 v outputs to the ign harness.  If a wire on the ign harness getting 12 v as a acc on a ign it can cause the r/s to fail.  When installing a r/s up must duplicating what the key turning over does.  Connect all your wires accordingly.  if i dies after a minute then it can be the tach signal.

The actual model I have has three options of tach, gas, or diesel. I just put it on gas to avoid the tach.