Hyundai Sonata 2002-Door problems
 

Hi,
My remote will not lock the doors anymore.This started happening a couple weeks ago but eventually the remote would work after hitting the button several times.As of yesterday it will not work at all.The button for the trunk lock works. When I hit the button for unlocking the doors the lights flash as they normally do, but that's all.I tried the spare remote but had the same results.Also tried replacing the batteries in the remotes but no luck.Is there some kind of module that went bad and how do I repair or replace this ?