2003 P5 factory remote auto lock?

[CTpro5]

just brought another P5 recently. It's a 2003 P5 with only factory remote.(No alarm lights). But i notice that it will AUTOLOCK by itself. If i unlock the car and wait, it will autolock itself after maybe 10-15 seconds.
My other P5 it's 2002, and it never do that. Is there any way to program this?? really don't want it lock with keys still inside. Thanks

 

[TheMAN]

they all do that... it will not auto lock if you opened and closed a door
but if you unlocked it and not do anything, it will relock itself after a minute

there is no way for the keyless remotes to work with the key in the ignition