I have the Viper 5901 installed in a 2004 Dodge Durango. It has worked perfectly for about a year and a half and then all of the sudden my 2-way responder started not working. Whenever I push the lock or unlock button, it lights up and shows the signalling picture in the top left corner for about 1 second. But then it just goes back unlit and doesn't perform any action on the car. I have been using my one-way remote for about the past month and it has worked fine. When I went to Best Buy, the guy suggested that the autokeypad lock might be on. I went through my manual, checked the functions on my 2-way (the function button still works), and the autokeypad lock is off. So after reading plenty of other forum posts and fiddling with it for a while, I am at a loss. I have a feeling it's something simple, but I just don't know. Any ideas?