Ford 1996 Taurus Manual page 129

Do not set a code that presents the numbers in
sequential order, such as 1/2, 3/4, 5/6, 7/8, 9/0.
Studies show that people who idly press the
buttons usually press a sequential pattern. Also,
do not select a code that uses the same button
five times. Thieves can easily figure out these
types of codes.
Unlocking the doors with the keyless entry
system
You must unlock the driver's door before you
unlock any of the other doors. If you let more
than five seconds pass between pressing
numbers, the system shuts down, and you have
to enter the code again. The system has shut
down if the keypad light is out. If the keyless
entry system does not work properly, use the
key or transmitter(s) to lock and unlock the
doors.
1. To unlock the driver's door, enter the factory
code or your personal code. All codes have
five numbers. After you press the fifth
number, the driver's door unlocks.
2. To unlock the passenger's door(s) and
liftgate (wagon), press the 3/4 button within
five seconds of unlocking the driver's door
or re-enter the code to open the driver's
door, then press 3/4.
3. To open the trunk (sedan) or unlock the
liftgate (wagon), enter the five-digit factory
code, then press the 5/6 button within 5
seconds.
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