Yesterday the key fob on our 2000 Sienna would not open the doors. We opened it mannually with the key. When depressing the lock button on the driver or front passenger door console all of the lock solenoids just buzz. When the key is placed in the ignition the door chime no longer chimes, it chirps and continues to chirp after closing the door and starting the engine. The engine starts fine otherwise, I would guess it is the battery. The only other to options I can think of are a bad ground causing low current or a control module. Anyone have other ideas?