Car Alarms: remote start and alarm, purple wire, door locks

Question
I have a 2003 Tahoe, with installed remote start and alarms. Every since I had battery problems, nothing works properly. I have no manuals, of course. The brand name on the portable remote is ALLSTART. I can't find them on the net, but I did find you and I'm hoping you can point me in the right direction. Right now, the alarms engage whenever I insert either key, and the remote will start the car, but will promptly turn it off again.
I noticed you had answered a previous question and directed the poster to 12volt.com for downloads, but I do not see that option on that website.
In any case, any advise you can give me would be much appreciated.
Thanks so much,
signed, Freezing,  in Fort McMurray Alberta

Answer
The 2003 Tahoe requires a databus module to interface the factory options such as door locks, arm/disarm, and passlock bypass.  It sounds to me as if the module may have lost it's memory and needs to be reprogrammed.  What I would recommend is to find the bypass module that was installed and get the make and model of the unit.  Once you have the make and model take a look at the12volt.com and see if anyone has posted a manual for it.    To find the module take a look at your OBD2 connector under the dash, the purple wire will have a wire connected to it, follow this back to the module.  If you can not find the manual for it, respond to this message with the exact make and model and I will see what I can find for you.