Ford Mustang Owner's Manual page 63

Locks and Security
1. Insert a previously
programmed coded key
4
3
into the ignition.
5
2. Turn the ignition
2
from the 3 (OFF)
position to the 4 (ON)
1
position. Keep the
ignition in the 4 (ON)
position for at least one second, but no more than
10 seconds.
3. Turn the ignition to the 3 (OFF) position, and
remove the coded key from the ignition.
4. Within ten seconds of removing the previously
programmed coded key, insert the other previously
programmed coded key into the ignition.
5. Turn the ignition from the 3 (OFF) position to the
4 (ON) position. Keep the ignition in the 4 (ON)
position for at least one second but not more than
10 seconds.
6. Turn the ignition to the 3 (OFF) position, and
remove the second key from the ignition.
7. Within twenty seconds of removing the previously
programmed coded key, insert the unprogrammed
key (new/valet key) into the ignition.
8. Turn the ignition from the 3 (OFF) position to the
4 (ON) position. Keep the ignition in the 4 (ON)
position for at least one second.
9. Your new unprogrammed key is now programmed.
If the key has been successfully programmed it will
start the vehicle's engine and the theft indicator light
will illuminate for three seconds and then go out. If
the key was not successfully programmed, it will not
start your vehicle's engine and the theft indicator
light will flash on and off rapidly. If failure repeats,
bring your vehicle to your dealer to have the new
key(s) programmed.
To program additional new unprogrammed key(s),
repeat this procedure from step 1 for each additional
key.
63
2004 Mustang (mus)
Owners Guide (post-2002-fmt)
USA English (fus)