I don't know what aftermarket security is. I thought that maby my remote button was stuck, but that does not seem to be the problem. I am wondering if a reset of the on board computer is the fix... ??? A short in the ciruitry somewhere... ??? Just wondering if someone out there already addressed a similar problem.
Maybe 'google' that brand , or check with local shop that does (specializes) those type of installs. Sounds like a programming problem.(or my other thought- wiring over time has become corroded and it's causing false signals to system).Good luck.