Ford 2003 Mustang Owner's Manual page 63

Replacing lost transmitters
Take all your vehicle's
transmitters to your
dealer if service is
required.
If you purchase
additional transmitters
(up to four may be
programmed), perform
the following procedure:
To reprogram the transmitters yourself, place the
key in the ignition and turn from OFF to ON eight
times in rapid succession (within 10 seconds) ending
in ON. After doors lock/unlock, press any control on
all transmitters (up to four). When completed, turn
the ignition to OFF. The doors will lock/unlock one
last time to confirm completion of program mode.
All transmitters must be programmed at the same
time.
Replacing the battery
The remote transmitter is powered by one coin type
three-volt lithium battery CR2032 or equivalent.
Typical operating range will allow you to be up to
10 meters (33 feet) away from your vehicle. A
decrease in operating range can be caused by:
weather conditions
nearby radio towers
structures around the vehicle
other vehicles parked next to the vehicle
Controls and features
63