RadioHighFlyer

Does anyone know what factory remote system came on the 1999 chevrolet lumina 3.1???? I had an aftermarket remote start system installed and they gave me different remotes. I worked on the car a while ago and had the battery disconnected now nothing works, but the car started locking the doors when i put the key in the ignition and unlocking them when i turn the car off, its never done that before. im pretty sure it has just reset to factory but i dont know how to get my keyless entry and remote start going again. please help