2003 Explorer Remote Starter / Anti-theft problem

Took the time to register and post this after reading some great information on this forum.

I recently purchased a used 2003 Explorer, 29K miles. Vehicle had an aftermarket alarm which was malfunctioning, had replaced with a remote starter & keyless entry system. The shop installed an Audiovox Pursuit PRO-9275T system, which works great for remote starting & door lock/unlock. The problem is the system will not disarm the vehicle's stock anti-theft system - if the doors are locked with the keypad or driver's side lock switch, then unlocked with the new remote, the horn sounds and lights flash upon opening a door. The key must then be used to disarm. Does anyone know if there might be a problem with the install, or is this Audiovox system not capable of disarming the anti-theft system?

Thanks,
Josh

Your best option would be to take it back to the place that installed it.

Your best option would be to take it back to the place that installed it.

Your best option would be to take it back to the place that installed it.