02 trailblazer remote entry problem !

I have a Keyless remote entry problem . The remote does not open the doors now until I get right up on the truck basicly like right in front of it. I have change the battery in the remote twice in the past two days once with a Rayco and now with a Duracell battery and I made sure I had the right battery number CR2032 . Does anybody no what the problem is could it be a fuse or short!

:eek7: