I've only come across self locking when I've unlocked the doors but then not opened them within 30 seconds or so. The idea is to leave the car secure should you accidentally unlock it after locking.
Self locking when the keys can be left inside is just an insanely stupid idea. ;-)
Right from when I bought my first car and my first house, I got into the habit that my keys never leave my trouser pocket except to unlock the house/car or to start the car. I never put them down on a table or the car seat: they always go back in my pocket as soon as I've used them. This may sound OCD (perhaps it is!) but I've never locked myself out of my house.
I've occasionally struggled to get back in the house, but that's either because my wife has left her keys in the inside of the front door when I've gone out and she's stayed at home, or because I've been gardening (and broken my "keys always in trouser pocket" rule) and the porch door has blown shut: it doesn't lock but it fits quite snugly and the handle has come off the outside of the door, so a screwdriver (or similar) is occasionally needed to prise it open again.
I borrowed one car which wouldn't let you lock the doors with the engine running. If I need to demist/de-ice the car I usually start it with the spare set, then lock the car (to prevent it being stolen) with the other key until it's ready for me to set off and I've finished my coffee.
My S-Max does. It's keyless ignition, so I just have the keys in my pocket. I was wearing trousers with useless pockets when I moved the car a few days ago, and the keys slipped out onto the seat - I didn't notice.
When I shut the door and tried to lock it (by tapping the sensor) it wouldn't work. I puzzled for about half a minute before I realised the keys weren't in my pocket, but inside the car.
I have been locked out a couple of times. I don't carry the keys when inside the house, but always take them if I step outside. However, on one occasion I was taking a delivery, stepped off the front step to pick up a box, and the door slammed.
I can now unlock the front door from my phone, or indeed any phone. So can the family. All two factor authentication.
I had a puzzler last year. I was due to drop off my partner, as she wasn't using her car that day. Both keys were on my key ring, so I unlocked both cars for her to pick up some stuff, locked hers, popped a bag in my boot, flung my coat on the back seat, shut the door and now found that I had no keys.
We searched high and low, in likely and unlikely places, but after half an hour admitted defeat, used the spare set and carried on.
We were away the next weekend, still a little concerned about the keys, but since we had discounted any chance of them being at large, reassured ourselves that all would be well.
Back home I started an even more comprehensive search of the car, removing all contents, looking behind trim... I was on the point of ringing the insurance company. Eventually, more in hope than expectation, I felt in the slim pocket on the back of the driver's seat.
If I hadn't experienced it myself, I would not have believed it possible.
Don't you mean *relocks* after a minute if no doors have been opened? My Jazz won''t lock itself if the doors are closed and left, but it will relock them automatically if they were previously locked, unlocked with the remote, but then no door or the boot was opened within a minute.
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