Ford 2003 Mustang Owner's Manual page 72

Controls and features
Programming spare SecuriLock
Spare SecuriLock
your dealership and programmed to your
SecuriLock passive anti-theft system (up to a total
of 8 keys). Your dealership can program your new
SecuriLock key(s) to your vehicle or you can do it
yourself using the following simple procedure. To
program a new SecuriLock
need two previously programmed SecuriLock
(keys that already operate your vehicle's engine). If
two previously programmed SecuriLock
not available (one or both of your original keys were
lost or stolen), you must bring your vehicle to your
dealership to have the spare SecuriLock
programmed.
Procedure to program spare SecuriLock
to your vehicle
New SecuriLock
mechanical key cut for your vehicle.
Conventional (non-SecuriLock ) keys cannot be
programmed to your vehicle.
You will need to have two previously programmed
SecuriLock keys and the new unprogrammed
SecuriLock key readily accessible for the
procedure. Please read and understand the entire
procedure before you begin.
1. Insert the first previously programmed
SecuriLock key into the ignition and turn the
ignition from OFF to RUN (maintain ignition in RUN
for at least one second).
2. Turn ignition to OFF and remove the first
SecuriLock key from the ignition.
3. Within five seconds of turning the ignition to OFF,
insert the second previously programmed
SecuriLock key into the ignition and turn the
ignition from OFF to RUN (maintain ignition in RUN
for at least one second but no more than 5 seconds).
72
keys can be purchased from
key yourself, you will
keys must have the correct
keys
keys
keys are
key(s)
keys