Mercury Sable 2000 Owner's Manual page 64

Controls and features
Press 7/8 and 9/0 controls on the
keyless entry pad at the same
time to lock the doors (doors
opened or closed).
Open a door and press the power door lock control to lock the doors.
There is a 20 second countdown when any of the above actions occur
before the vehicle becomes ARMED.
Each door/hood or liftgate (wagon) arm individually, and if any
door/hood or liftgate (wagon) is open, then it must be closed for it to be
armed.
When you press the lock control
twice within three seconds on your
remote entry transmitter, the horn
will chirp once to let you know that
all doors/hood and liftgate (wagon)
are closed.
If the doors/hood or liftgate (wagon) are not closed and you press the
remote entry transmitter twice to confirm the doors are locked, the horn
will chirp twice to warn you that a door/hood or liftgate (wagon) is still
open.
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