I have had the same problem with the key fob activating the panic alarm and then disabling the key fob, so having to use the "secret" key to open the doors. Even then, after starting the car and turning it off again, the alarm continues to sound. Pressing the panic button after about 30 seconds has elapsed will turn the alarm off. I contacted my dealer but they had not heard of the problem before (I am in Alberta, Canada). This is a vehicle that was ordered in late October and delivered on Dec 19th, 2008. According to the other posts here, this was a known problem several months ago, yet it persists even now.
Does anyone who has had this problem rectified, know what the TSB number was?
Thanks folks!
Miles/..