The security system sounds like it is causing the problem. The stereo is usually tied into it, so it may be part of the issue. It is hard to say exactly what is the source, but the symptoms are that of a security system with the car locked.
I am attaching a wiring diagram of the anti-theft system so you might be able to find a wire that needs to be connected/dis-connected or ground out to get the truck working again.
Tuesday, February 28th, 2012 AT 1:15 AM