Mercury 1996 Grand Marquis Manual page 130

3. To unlock the trunk, press the 5/6 button
within five seconds of unlocking the driver's
or passenger's doors, or re-enter the code to
open the driver's door, then press 5/6.
As long as the driver's door has been unlocked
first, you can open the passenger's doors or the
trunk in any order.
Locking the doors with the keyless entry
system
Along with unlocking your doors, you can use
the keyless entry system to lock the doors. You
can also use the Autolock feature to
automatically lock the doors after you get in the
vehicle.
To lock all of the vehicle's doors at the same
time, press 7/8 and 9/0 at the same time. It is
not necessary to first enter the keypad code.
Autolock (With Keyless Entry if Equipped)
The Autolock feature will automatically lock all
the doors when:
the vehicle doors are fully closed
the ignition key is turned to the ON position
someone is sitting in the driver's seat or a
heavy object is placed on the seat, and
the vehicle is in any forward or reverse gear.
The Autolock feature will repeat when:
the ignition key remains in the ON position
someone remains sitting in the driver's seat
or a heavy object is on the seat,
a door is opened and then closed, and
the vehicle is in any forward or reverse gear.
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