There are two automatic re-lock functions in the smart: the re-lock above 8MPH, and a re-lock if the doors are left closed on a stationary car for 60 seconds. Interestingly, the first works properly on my car, but the second has never worked. In the owner’s manual, I can find no way to enable or disable the feature. However, this is a “malfunction” with which I am pleased, since I find the 60-second re-lock or alarm-arming on modern vehicles exceedingly annoying.