If memory serves me correctly, the "In-Case-****" lock cylinder under the mirror will disarm the alarm, just as the lock cylinder in betwen the seats in late Gen-2's will. In the case of the SRT, this same lock cylinder also opens the door. But yes, the security system may not have been armed as mentioned above. it is an immobilizer system, and will not allow the car to start. one good feature I like about the SRT security system, is that it has "zones" built in, and will "learn" which zones need to be protected whenever you lock the car. Example: if you lock/arm the car with the hood open, the light will remain solid, then learn after a few seconds that the hood does not need to be protected. if you open any of the OTHER zones, it goes off. if you close the hood, it adds that zone back in. (trunk does the same thing when you open it with the FOB) The previous generation will not arm the alarm unless all zones are closed.