[turbo2ltr]

You can put your fob in the rear cup holder and see if that makes a difference as when you put it in there, it does not rely on the fob's battery. (just for clarity, I'm saying when you put it in the cupholder, it is close enough to the antenna it does not need a fob battery, normally it does rely on the battery and as @ember1205 said, you should make sure it's good.)

Here's a pic of the unit. You are looking at the bottom of the cup holders. The part on the left is the USB/Aux input in the center console. The part on the bottom of the cup holders (upper center) is the fob proximity senser and the unit with the 2D barcode on it is the controller for it.