Car Alarms: Unlock function activating alarm, chevy blazer, 2000 chevy blazer

Question
I just had a Audiovox remote starter put into my 2000 Chevy Blazer.  However, about half of the time I push the "Unlock doors" button, the car horn alarm goes off and there is no way to stop it except starting the car ignition.  I've taken it back to the installers and they said they installed the bypass and a "disarm" wire (not exactly sure what that is), but the problem continues.  They've told me that while installing it that they had to charge the battery and I should get it checked as that could be something causing the problem.  I did, however, get it checked at two places and it checked out fine...  Any feedback you can give regarding this issue would be appreciated.
Thanks.

Answer
The disarm wire they are referring to is indeed what is required to turn off the factory alarm.  This is a light green wire at the BCM, when this wire sees a negative pulse it disarms the factory alarm.  If the installer says they hooked up the disarm wire from the Audiovox to this wire and it is still going off when you push unlock then I would have to think that the system is not providing a good enough negative to this wire.  In any case, if you purchased the system from them and paid them to put it in they should be looking into the problem.  All of the shops I know of give a lifetime warranty on installation and Audiovox gives a very good warranty on their products.  The installers are correct in recommending that you have your battery looked at, but most shops (including myself) keep a load tester on hand to test the vehicle battery.  If the battery has been tested and it tests fine then I would say the problem is with either the length or strength of the ground being provided to the factory disarm wire.  

If I were the installer, I would be adding a relay to the Factory Alarm Disarm(FAD) output to provide  a stronger ground than the transistorized output from the brain provides.  This would ensure that the BCM is seeing a solid ground and eliminate the possibility of the brain just not providing a strong enough ground.