Deoes your red light stay on? Does it come on at all? Does the remote work for both lock and unlock? I would guess either lousy batteries off the rack or a sticky button under the button cover. There are more than a few of us that have run into dead battereis off the rack. If your remote is working I would try a different druggist for your batteries.
KEY WORKS FINE TRIED DIFFERENT SHOPS FOR BATTERIES THIS HAS BEEN GOING ON FOR SOME TIME,PUT NEW ONES IN WORKS FINE AFTER ABOUT A WEEK YOU NEED TO GET CLOSER AND CLOSER TO VEHICLE FOR REMOTE TO WORK THEN LOW KEY INFO ON DASH :x