self locking, is this a fault??

When we looked at a car last week that seems like a good buy we noticed that when standing outside holding the keys the car locked itself and the drivers mirror folded,,,Ive heard of cars that have had this feature and it sounds like a pain in the arse,,anyway now Ive seen a post which described this behaviour in a C3 Picasso as a fault and not a feature,,so is automatic self locking supposed to be happening because if not I would like to get the dealer to look at it for me before we buy?
Many thanks in advance for your help,
Steve.

Hi

They self lock when they have been remotely unlocked, but no doors were opened.

It's as if the BSI thinks you unlocked the car but forgot why you did and it decides to lock itself, so you can unlock it again.

It shouldn't lock itself if a door had since been opened and closed.

Many thanks,,and of course I cannot remember if it happened before or after opening doors,,,but at least I now know and can check.
Once again that info was really useful,
Steve.

Hello C3car, your dead right, and they work exactly as you described, many thanks for clearing that up.
Steve.
Im just about to ask another question about the mirrors now,,,