Recently i have been doing electrical work on my 2000 Avalon XLS. At the moment the passenger door ECU (passenger do power window and lock switch) is not in the car due to a malfunction. I have a replacement on order and the car currently works absolutely perfectly other than the passenger window not rolling down (because of this missing ECU). My concern is Every time I go to unlock the car with my key fob the horn sounds for a brief second. Which it has never done before. The other thing is the doors don't unlock. I then have to then press the button a second time and it unlocks and I go on my marry way. So the question I have is this horn sounding a bad thing? Or is it just the car being confused due to the lack of passenger door control switches? I will know for sure when I get the new ECU this week and put it in however I just want to be sure the system is fine, while Jap electronics are great they cost $$$$ to replace.