rs/keyless entry stopped working

for remote starting, it sounds like you need to reprogram the tach. did it recently get cold in the area? if so the unit it seeing the tach higher than normal and wont allow it to start. Also take note of the security light in your cluster. if its flashing during remote start, its a pats bypass problem.

door locks, it could be relay problems or if they/you used a bypass (data) that did door locks, triggers etc, it might be a loose connection or the bypass is just going bad which is rare. 

The Theft light is flashing rapidly when I try to start it, and I installed the system and set up the locks using 2 relays in the 5 wire configuration. I'll take a look at all of the connections to make sure there's nothing loose