I'm noticing this more and more nowadays. I did some quick web searching, and it appears to be a GM 'feature' predominantly. The reverse/backup lights can stay on for minutes after the owner left the vehicle and pressed the lock button. I guess it's meant to be a safety feature to help illuminate the area around the vehicle, but it causes all sorts of confusion in parking lots. You see a car with its backup lights on, you think it wants to reverse, so you slow down and/or stop and wait to let them leave. You wait and wait, only to realize there is nobody in the vehicle (hard to tell after dusk). Confusing technology. Ugh...
http://mechanics.stackexchange.com/quest...tion-to-reverse
http://oppositelock.kinja.com/general-motors-biggest-design-flaw-in-my-opinion-478752056
http://mechanics.stackexchange.com/quest...tion-to-reverse
http://oppositelock.kinja.com/general-motors-biggest-design-flaw-in-my-opinion-478752056