theft deterrent system

Been having problems with this for a very long time.....to make a long story short, need input on what might be the problem....
Security light comes on...have had the sensors changed (pass lock sensor and lock cylinder ......light still will periodically come on...kept taking to the dealership.....would not give them codes when hooked it up....finally drove it in as soon as light came on,.....still didn't give them a code...just recently replaced body control module...light just started coming on again....any suggestions? I'm tired of wasting my money....is there something I can suggest to the dealership that they aren't checking?
Any help would be much appreciated.
BeeAnn

Sorry to say this but suggest them buying it , lol. I had the same problem but it stoped after I put in a new pass lock.

how did you just replace the passlock system