Recently my Equinox's two fobs stopped working. Both at the same time. I can program the fobs and they will work until the security system activates, then neither fob will lock or unlock the doors. Also I have to lock the doors using the power door locks but unlocking the door with the key the horn blows until the SUV is turned to the on position. Then the horn stops. I have owned the car for about two years and they worked fine until a week ago. I changed the battery in on of the fobs but no help. Can anyone help with diagnosis or what to do? Even if I can stop the horn from blowing when unlocked would make my wife happy.