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Is it technically possible to set a timer for central locking so that it locks after 5 minutes, say, after the engine has been turned off? This is to help if you forget to lock your car at night.

Details of any other known solutions are also gratefully received.

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Some cars do this, yes. Most do not-the risk of course is that you leave your keys in the car and they get locked in – Rory Alsop Oct 9 '11 at 16:08
I am looking for a modification. How would you go about getting this done? – Raphael Oct 9 '11 at 18:43
This might sound silly, but I'd recommend asking over on rather than here – Rory Alsop Oct 9 '11 at 19:38
Thanks, I will do that. – Raphael Oct 10 '11 at 13:50

An auto-electrician who installs alarms and remote unlocks would probably be able to help.

The cars that do this already generally require you take the key out, too. I know high-end Subarus will re-lock a car within a minute or so if you don't open the door.

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Thanks. I will ask one of those. The alternative I suppose is just for the car to beep annoyingly every minute or two that but might drive someone mad :) – Raphael Oct 10 '11 at 13:51

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