PEUGEOT 508 Handbook page 48

Access
If one of the doors or the boot is still
open or if the key for Keyless entry and
Starting system has been left inside
the vehicle or if the ignition is on, the
central locking does not take place.
When the vehicle is locked, if it is
unlocked inadvertently, it will lock itself
again automatically after about thirty
seconds unless a door is opened.
If the alarm was previously activated,
it will not be reactivated automatically.
the folding and unfolding of the door
mirrors by the remote control can be
deactivated by a PeugeOt dealer or a
qualified workshop.
46
As a safety measure (children on
board), never leave the vehicle without
taking the key for the Keyless entry and
Starting system, even for a short period.
guard against theft when the key for the
Keyless entry and Starting system is
in the recognition zone with the vehicle
unlocked.
In order to preserve the charge of the
cell battery in the remote control, the
"hands-free" functions go into extended
stand-by after 21 days of non-use. to
restore these functions, press one of
the remote control buttons or start the
engine with the electronic key in the
reader.