I did some tests too. Same result, doors will only lock if the drivers door is closed. All the closed doors lock. There is a clonk as they lock. I tried with the drivers door closed and boot open, the lights flashed when the boot closed and locked. I thought I was being methodical when I started the test - but I didn't think about two doors being open, What happens then? Do the lights only flash when both doors are closed? Also I wasn't patient enough to test the time delay. My guess it is 15 seconds - then what happens? Do all the doors unlock, or does the finally closed door still lock, or does it close and stay unlocked? (why 15 seconds? That is how long you get after pressing the remote to to unlock the doors before opening a door. It might just play a role in locking too - who knows?)
No clonk if the drivers door open when lock is pressed, so that is some feedback that nothing locked.
I was concerned about locking keys in the car, done this twice, both times in the US. Perhaps cars in the US are set up differently? I seem to recall they are often set up to require a double press to unlock all the doors, more often not the default option in the UK.
Both times Fairly disastrous. Once with a 5 year locked in, and all the emergency hooters going off. (I think we managed to get him to crawl into the boot and pull the hostage release lever!) Once to a hertz hire car with the engine running (only one set of keys of course), took about an hour to get assistance from a locksmith. Should be an interlock between running engine and key initiated locking?
I did two experiments. Left one pair of keys in the boot, and locked with the other, with the boot open, and then closed the boot. (you know, get out, close the drivers door, open the boot, put the keys down for some reason, and then close the boot forgetting about the keys). SO the other test, I used the same keys, and tossed them into the open boot.
Result, car locked both times. Keys locked in the car.Luckily a different set of keys can unlock the car.
My conclusion,: car companies need to employ dumber designers, who get things wrong 🙂