Page 57 of 240

Unlocking the doors
1. Pressand release to unlock the driver’s door.
Note:The interior lamps will illuminate.
2. Press
and release again within three seconds
to unlock the passenger door.
Locking the doors
1. Pressand release to lock all the doors.Note:
The interior lamps will turn off (unless the dome
lamp control is in the full-up position), and the
headlamps and parking lamps will flash.
2. Press
and release again within three seconds
to confirm that all the doors are closed and locked.
Note:The doors will lock again, the horn will chirp
once and the headlamps and parking lamps will
flash.
If any of the doors are not properly closed the horn
will make two quick chirps.
Sounding a panic alarm
Press
to activate the alarm. The horn will
sound for a maximum of 30 seconds and the
parklamps will flash for a maximum of 3 minutes.
Press again or turn the ignition to ON to deactivate,
or wait for the alarm to timeout in 3 minutes.
Note:The panic alarm will only operate when the
ignition is in the OFF or ACC position.
Opening the trunk
Pressonce to open the trunk.
•Ensure that the trunk is closed and latched before
driving your vehicle. Failure to properly latch the
trunk may cause objects to fall out or block the
driver’s rear view.
Replacing the battery
The remote entry transmitter uses one coin type
three-volt lithium battery CR2032 or equivalent. The
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
57
Page 58 of 240

typical operating range for your remote entry
transmitter is approximately 10 meters (33 feet). A
decrease in the operating range could be caused by:
•weather conditions,
•nearby radio towers,
•structures around the vehicle and
•other vehicles parked next to the vehicle.
To replace the battery:
1. Twist a thin coin
between the two halves
of the remote entry
transmitter near the
key ring. DO NOT
TAKE THE RUBBER
COVER AND CIRCUIT
BOARD OFF THE FRONT HOUSING OF THE
REMOTE ENTRY TRANSMITTER.
2. Do not wipe off any
grease on the battery
terminals on the back
surface of the circuit
board.
3. Remove the old battery.
4. Insert the new battery. Refer to the diagram
inside the remote entry transmitter for the correct
orientation of the battery. Press the battery down to
ensure that the battery is fully seated in the battery
housing cavity.
5. Snap the two halves back together.
Note:Replacement of the battery willnotcause the
remote transmitter to become deprogrammed from
your vehicle. The remote transmitter should operate
normally after battery replacement.
Replacing lost remote entry transmitters
If you would like to have your remote entry
transmitter reprogrammed because you lost one, or
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
58
Page 59 of 240

would like to buy additional remote entry
transmitters, you can either reprogram them
yourself, or takeall remote entry transmittersto
your authorized dealer for reprogramming.
How to reprogram your remote entry
transmitters
You must haveall remote entry transmitters
(maximum of four) available before beginning this
procedure.
To reprogram the
remote entry
transmitters:
1. Ensure the vehicle is
electronically unlocked.
2. Put the key in the
ignition.
3. Turn the key from the 2 (LOCK) position to 3
(OFF).
4. Cycle eight times rapidly (within 10 seconds)
between the 3 (OFF) position and 4 (ON).Note:
The eighth turn must end in the 4 (ON) position.
5. The doors will lock, then unlock, to confirm that
the programming mode has been activated.
6. Within 20 seconds press any button on the remote
entry transmitter.Note:If more than 20 seconds
have passed you will need to start the procedure
over again.
7. The doors will lock, then unlock, to confirm that
this remote entry transmitter has been programmed.
8. Repeat Step 6 to program each additional remote
entry transmitter.
9. Turn the ignition to the 3 (OFF) position after
you have finished programming all of the remote
entry transmitters.Note:After 20 seconds, you will
automatically exit the programming mode.
10. The doors will lock, then unlock, to confirm that
the programming mode has been exited.
3
1
2
5
4
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
59
Page 60 of 240

Illuminated entry
The interior lamps illuminate when the remote entry
system is used to unlock the door(s) or sound the
personal alarm.
The illuminated entry system will turn off the
interior lights if:
•the ignition switch is turned to the ON position,
or
•the remote transmitter lock control is pressed, or
•after 25 seconds of illumination.
The dome lamp control (if equipped) mustnotbe
set to the OFF position for the illuminated entry
system to operate.
The inside lights will not turn off if:
•they have been turned on with the dimmer
control, or
•any door is open.
The battery saver will shut off the interior lamps 30
minutes after the ignition has been turned to the
OFF position, 10 minutes after if the last door is left
open, and 30 minutes after if the trunk is left open
or the dome lamp switch is left on.
SECURILOCKPASSIVE ANTI-THEFT SYSTEM
SecuriLockpassive anti-theft system is an engine
immobilization system. This system is designed to
prevent the engine from being started unless a
coded key programmed to your vehicleis used.
The use of the wrong type of coded key may lead to
a“no-start”condition.
Your vehicle comes with two coded keys; additional
coded keys may be purchased from your dealer. The
dealer can program your spare keys to your vehicle
or you can program the keys yourself. Refer to
Programming spare keysfor instructions on how
to program the coded key.
Note:The SecuriLockpassive anti-theft system is
not compatible with non-Ford aftermarket remote
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
60
Page 61 of 240

start systems. Use of these systems may result in
vehicle starting problems and a loss of security
protection.
Note:Large metallic objects, electronic devices that
are used to purchase gasoline or similar items, or a
second coded key on the same key chain may cause
vehicle starting issues. You need to prevent these
objects from touching the coded key while starting
the engine. These objects will not cause damage to
the coded key, but may cause a momentary issue if
they are too close to the key when starting the
engine. If a problem occurs, turn the ignition off,
remove all objects on the key chain away from the
coded key and restart the engine.
Theft indicator
The theft indicator is located in the instrument
cluster.
•When the ignition is in the OFF position, the
indicator will flash once every 2 seconds to
indicate the SecuriLocksystem is functioning as
a theft deterrent.
•When the ignition is in the ON position, the
indicator will glow for 3 seconds, then turn off to
indicate normal system functionality.
If a problem occurs with the SecuriLocksystem,
the indicator will flash rapidly or glow steadily when
the ignition is in the ON position. If this occurs, the
vehicle should be taken to an authorized dealer for
service.
Automatic arming
The vehicle is armed
immediately after
switching the ignition
to the 3 (OFF)
position.
The
THEFTindicator
will flash every two
seconds when the
vehicle is armed.
3
2
1
5
4
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
61
Page 62 of 240

Automatic disarming
Switching the ignition to the 4 (ON) position with a
coded keydisarms the vehicle.
•The
THEFTindicator will illuminate for three
seconds and then go out.
•If the
THEFTindicator stays on for an extended
period of time or flashes rapidly, have the system
serviced by your dealer.
Replacement keys
If your keys are lost or stolen and you don’t have an
extra coded key, you will need to have your vehicle
towed to a dealership. The key codes need to be
erased from your vehicle and new coded keys will
need to be programmed.
Replacing coded keys can be very costly. Store an
extra programmed key away from the vehicle in a
safe place to help prevent any inconveniences.
Please visit an authorized dealer to purchase
additional spare or replacement keys.
Programming spare keys
You can program your own coded keys to your
vehicle. Please read and understand the entire
procedure before you begin.
Tips:
•A maximum of eight keys can be coded to your
vehicle.
•Only use Securilockkeys.
•You must have two previously programmed coded
keys (keys that already operate your vehicle’s
engine) and the new unprogrammed key(s)
readily accessible.
•If no previously programmed coded keys are
available, you must take your vehicle to your
dealer to have the spare key(s) programmed.
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
62
Page 63 of 240

1. Insert a previously
programmed coded key
into the ignition.
2. 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 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.
3
2
1
5
4
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
63
Page 64 of 240
SEATING
Notes:
Reclining the seatback can cause an
occupant to slide under the seat’s safety
belt, resulting in severe personal injuries in the
event of a collision.
Do not pile cargo higher than the seatbacks
to reduce the risk of injury in a collision or
sudden stop.
Adjustable head restraints
Head restraints help to limit head motion in the
event of a rear collision. Adjust your head restraint
so that it is located directly behind your head or as
close to that position as possible.
The head restraints can
be moved up and
down.
4–way head restraints (if equipped)
Your vehicle may have
head restraints that
can be moved in four
directions:
•up and down
•forward or backward
Adjusting the front manual seat (if equipped)
Never adjust the driver’s seat or seatback
when the vehicle is moving.
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Seating and Safety Restraints
64