If it is on the factory remote, it will have a blue start button, or press lock and unlock together for a second or so. Chances are its an add on especially if there is a sticker. Read the sticker. Does it give a reference to a brand, DEI will have a reference if it is by DEI, i believe code alarm stickers are about an inch, inch and a half with a metallic style background.
Also look under the under dash panel below the steering wheel, that would be the location of the module. Unless your not sure what it is supposed to look like down there, then you will just be hurtin your back. You may have to drop that panel and see what you can find down there. Any information on remote starters whatsoever in the glove box.????