I’ve searched everywhere for this problem and apparently I’m the only person in the world that has it 
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My alarm “arms” itself about 75% of the time after everyone gets out and closes the doors and we leave it unlocked for some time (sometimes it seems to happen shortly after getting out and sometimes longer..). This has been very annoying because I’ll often go out to the car without a fob to grab something (knowing it’s unlocked) and the alarm will sound. Based on my research this is not a feature on the 2013 lx570. It can only be armed when the car is locked.
A few other details. The alarm takes about 5 seconds to sound after opening the door. It happens with every door. The alarm indicator shows solid when this occurs so it seems to be purposeful.
.My alarm “arms” itself about 75% of the time after everyone gets out and closes the doors and we leave it unlocked for some time (sometimes it seems to happen shortly after getting out and sometimes longer..). This has been very annoying because I’ll often go out to the car without a fob to grab something (knowing it’s unlocked) and the alarm will sound. Based on my research this is not a feature on the 2013 lx570. It can only be armed when the car is locked.
A few other details. The alarm takes about 5 seconds to sound after opening the door. It happens with every door. The alarm indicator shows solid when this occurs so it seems to be purposeful.
