Ford 2003 Mustang Owner's Manual page 70

Controls and features
1. Turn the ignition key from OFF to RUN/ACC.
2. Press the power door UNLOCK control three
times.
3. Turn the ignition key from RUN/ACC to OFF.
4. Press the power door UNLOCK control three
times.
5. Turn the ignition key from OFF to RUN/ACC. A
horn chirp indicates the enable/disable feature is
entered.
6. Press the power door UNLOCK control one time.
7. Press the power door LOCK control to toggle the
Autolock/Relock state. You will receive a horn chirp
followed by either a long honk, autolock/relock is
enabled, or no honk, autolock/relock is disabled.
8. Turn ignition to OFF.
If autolock/relock has been changed, the horn will
chirp to confirm procedure is complete.
SECURILOCK
The SecuriLock
an advanced level of vehicle theft protection. Your
vehicle's engine can only be started with the two
special SecuriLock
provided with your vehicle. Each time you start your
vehicle, the SecuriLock
SecuriLock passive anti-theft system. If the
SecuriLock key identification code matches the
code stored in the SecuriLock
the vehicle's engine is allowed to start. If the
SecuriLock key identification code does not match
the code stored in the system or if a SecuriLock
key is not detected (vehicle theft situation), the
vehicle's engine will not operate.
If there is any potential SecuriLock
problem with your vehicle, ensure ALL
SecuriLock
the dealership, to aid in troubleshooting.
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PASSIVE ANTI-THEFT SYSTEM
passive anti-theft system provides
electronically coded keys
key is read by the
keys for that vehicle are brought to
anti-theft system,
anti-theft