Ford Grand Marquis Owner's Manual page 117

RUN position. The interior lights will not turn
off if you have turned them on manually or if a
door is open.
Replacing the batteries
The remote entry transmitter is powered by two
coin type three-volt lithium 1616
batteries (included) that should last for several
years of normal use. If you notice a significant
decrease in operating range, the batteries should
be replaced. Replacement batteries can be
purchased at most pharmacies, watch stores or
at your Ford or Lincoln-Mercury dealer.
NOTE: The operating range of the remote
entry system can also be affected by
weather conditions (such as very cold
temperatures) or structures around the
vehicle (buildings, other vehicles, radio
and TV towers, etc.). Typical operating
range will allow you to be up to 33
feet (10 meters) away from your
vehicle.
Replacement/additional transmitters
In the event a transmitter is lost, a new one may
be purchased from your dealer.
To program replacement or additional
transmitters you must have all the transmitters
intended for use on your vehicle.
Initiating the following procedure erases all prior
programmed transmitters, thus ALL must be
reprogrammed at the same time.
1. Enter the factory keyless entry code. Your
personal code will not allow programming.
2. Press the 1/2 button.
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