I had this issue on mine, when i bought it, i was told it had a alarm fault, but just left it, then in august my wife needed something from my car, she had trouble getting in (one click and trying the passenger door 2 clicks to do that) but she got the windows down and then opened the door from inside, and then hey presto my alarm started working again, just like that, and worked fine until the weekend, when i was putting on my new mudflaps i decided to clean the inner arches washed it all down and then it came up with a fault again, but last night went out to it and now it is working again so i believe it must be dampness, so tomorrow i intend to take the arch liners out and look at the alarm sounder. this may be teh same issue on yours buddy does the siren beep beep when unlocking?