IMO lack of alarm system in TCH is by far the biggest oversight by Toyota on this car. Even more frustrating is the fact that the car has all the elements of build in alarm system, from the door open sensor, remote lock/unlock, all the way to engine cutoff. The only thing missing is some simple relay that would activate the horn if the door was open without unlock signal from the FOB. I'm not affraid of the car being stolen as much as I'm affraid of somebody breaking the window and stealing my navigation system which costs over $2000 when purchased alone, BTW how is that possible if that option on the car costs only $1200 ???? I think VP3200 is overkill, since it duplicates most of the functions the car already has, but I'm thinking of putting some simple, non integrated alarm on my own, just for the peace of mind. If you want I have PDF file with instalation instructions for VIP system, I can send it you to see for yourself, if you can do it.