Have you tried turning the key in the door before this happened. i bought mine used and never tried using the key in the actual door until 1 thousand miles before the factory warrant ran out and discorvered it didn't work. The dealer had to repalce the locking mechanism. Do the lights come on when u hit the key fob? can you open the back hatch? does the light on the keb fod come on? Even if the battery is dead using the key in the door should work. Sounds like there is more than one cause of your problem.