I had a viper 791 alarm put in. The shop used a DEI 556U bypass module, but it has given me problems from day one and they can't figure it out. What happens is once in a while intermittantly when I actually put the key in the starter to go start it, it does not read right, resulting in the theft light blinking fast and a crank/no start condition. If you play with it for a few times it works, and the remote start works. I was under the impression that the bypass should not have effected the factory system when you use the key, only on remote start, so either they have something wired wrong, or it is the wrong module. Does anybody know any information about this? I have a 2001 GT Convertible. Thanks you much!