Page 16 of 240
•Optional instrument cluster
Engine coolant temperature gauge:
•Standard instrument cluster
•Optional instrument cluster
Indicates engine coolant
temperature. At normal operating
temperature, the needle will be in
the normal range (between“H”and
“C”). If it enters the red section, the
engine is overheating. Stop the
vehicle as soon as safely possible,
switch off the engine and let the
engine cool, refer toWhat you
should know about fail-safe
coolingin theMaintenance and specificationschapter.
Never remove the coolant reservoir cap while the engine is
running or hot.
km/h
MPH
km S
TEMPH
C
N
O
R
M
H
C
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
16
Page 18 of 240
•Optional instrument cluster
Refer toElectronic Message Center
in theDriver Controlschapter for
Trip A and Trip B features.
Battery voltage gauge (if
equipped):Indicates the battery
voltage when the ignition is in the
ON position. If the pointer moves
and stays outside the normal
operating range (as indicated by
arrows), have the vehicle’s electrical
system checked as soon as possible.
Engine oil pressure gauge (if
equipped):Indicates engine oil
pressure. The needle should stay in
the normal operating range
(between“L”and“H”). If the needle
falls below the normal range, stop
the vehicle, turn off the engine and
check the engine oil level. Add oil if
needed. If the oil level is correct,
have your vehicle checked at your
dealership or by a qualified
technician.
km/h
MPH
km S
VOLTSH
L
OILH
L
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
18
Page 49 of 240

Compass calibration adjustment
Perform this adjustment in an open
area free from steel structures and
high voltage lines:
1. Press and hold the MODE control
until CAL appears in the display
(approximately eight seconds) and
release.
2. Drive the vehicle slowly (less
than 5 km/h [3 mph]) in circles until
CAL indicator turns off in about 2–3 complete circles.
3. The compass is now calibrated.
OVERHEAD CONSOLE WITH MOON ROOF (IF EQUIPPED)
The appearance of your vehicle’s overhead console will vary according to
your option package. Some of the features in the overhead console
include Compass, Homelink, and Moon Roof controls.
Compass mode
The compass reading may be affected when you drive near large
buildings, bridges, power lines and powerful broadcast antenna. Magnetic
or metallic objects placed in, on or near the vehicle may also affect
compass accuracy.
1. Turn ignition to the ON position.
2. Start the engine.
3. From a blank display press and
release the MODE button once. The
directional heading will be
displayed.
Note:If the compass is
de-calibrated, CAL will be displayed
in the right corner of the display.
Refer to“Calibration mode”in this
section for more details.
4. The overhead console displays the compass heading in one of eight
directions: NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH,
SOUTHWEST, WEST, and NORTHWEST.
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
49
Page 82 of 240

3. Press and hold 1•2 for two seconds. All of the vehicle doors will lock
and then unlock to confirm erasure.
Unlocking the doors and releasing the trunk with the keyless entry
system
To unlock the driver door, enter either the factory-set code or personal
code (each digit pressed within 5 seconds of prior digit). The interior
lamps will illuminate.
•Tounlock all doors,enter the factory-set code or personal code
(driver door unlocks) and press 3•4 within five seconds.
•Torelease the trunk,enter the factory-set code or personal code
(driver door unlocks) and press 5•6 within five seconds.
After the factory-set code or personal code has been entered, you can
unlock all doors (press 3•4) and release the trunk (press 5•6) as
long as the controls are pressed within 5 seconds of each other.
Locking doors with the keyless entry system
It is not necessary to enter the factory-set code prior to locking all doors.
Tolock the doors,press 7•8 and press 9•0 at the same time.
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 acoded key programmed to your vehicleis used.
The SecuriLockpassive anti-theft system is not compatible with
non-Ford aftermarket remote start systems. Use of these systems may
result in vehicle starting problems and a loss of security protection.
THEFT INDICATOR
The theft indicator is the flashing red indicator located on the dash
panel.
•When the ignition is in the 1 (OFF/LOCK) 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 3 (ON) position, the indicator will glow for
3 seconds 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 3 (ON) position. If
this occurs, the vehicle should be taken to an authorized dealer for
service.
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
82
Page 83 of 240

Automatic arming
The vehicle is armed immediately
after switching the ignition to the 3
(OFF) or 2 (LOCK) position. The
indicator on the instrument panel
will flash every two seconds when
the vehicle is armed.
Automatic disarming
Switching the ignition to the 4 (ON) position with acoded keydisarms
the vehicle. The indicator on the instrument will illuminate for three
seconds and then go out. If the indicator stays on for an extended period
of time or flashes rapidly, have the system serviced by your dealership or
a qualified technician.
Key information
Your vehicle is supplied withtwo coded keys (or three, if your
vehicle is equipped with the valet feature).Only acoded keywill
start your vehicle. Spare coded keys can be purchased from your
dealership. Your dealership can program your key or you can“do it
yourself.”Refer to theProgramming spare keyssection in this chapter.
The following items may prevent the vehicle from starting:
•Large metallic objects
•Electronic devices on the key chain that can be used to purchase
gasoline or similar items
•A second key on the same key ring as thecoded key
If any of these items are present, you need to keep these objects from
touching thecoded keywhile starting the engine. These objects and
devices cannot damage thecoded key,but can cause a momentary“no
start”condition if they are too close to the key during engine start. If a
problem occurs, turn the ignition to the OFF position and restart the
engine with all other objects on the key ring held away from the ignition
key. Check to make sure thecoded keyis an approved Mercurycoded
key.
3
2
1
5
4
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
83
Page 84 of 240

If your keys are lost or stolen you will need to do the following:
•Use your spare key to start the vehicle, or
•Have your vehicle towed to a dealership or a locksmith. The key codes
will need to be erased from your vehicle and new key codes will need
to be re-coded.
Replacing coded keys can be very costly and you may want to store an
extra programmed key away from the vehicle in a safe place to prevent
an unforeseen inconvenience.
The correctcoded keymust be used for your vehicle. The use of the
wrong type ofcoded keymay lead to a“no start”condition.
If an unprogrammed key is used in the ignition it will cause a“no
start”condition.
Programming spare keys
A maximum of eight keys can be coded to your vehicle. Only
SecuriLockkeys can be used. To program acoded keyyourself, you
will need two previously programmedcoded keys(keys that already
operate your vehicle’s engine) and the new unprogrammed key(s) readily
accessible for timely implementation of each step in the procedure.
If two previously programmed coded keys are not available, you must
bring your vehicle to your dealership to have the spare coded key(s)
programmed.
Please read and understand the entire procedure before you begin.
1. Insert the first previously
programmedcoded keyinto the
ignition and turn the ignition from 3
(OFF) to 4 (ON) (maintain ignition
in 4 (ON) for at least one second).
2. Turn ignition to 3 (OFF) then 2
(LOCK) and remove the firstcoded
keyfrom the ignition.
3. Within ten seconds of removing
the firstcoded key,insert the
second previously programmedcoded keyinto the ignition and turn the
ignition from 3 (OFF) to 4 (ON) (maintain ignition in 4 (ON) for at least
one second but no more than ten seconds).
4. Turn the ignition to 3 (OFF) then 2 (LOCK) and remove the second
coded keyfrom the ignition.
3
2
1
5
4
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
84
Page 85 of 240
5. Within twenty seconds of removing the secondcoded key,insert the
new unprogrammed key (new key) into the ignition and turn the ignition
from 3 (OFF) to 4 (ON) (maintain ignition in 4 (ON) for at least one
second). This step will program your new key.
6. To program additional new unprogrammed key(s), wait at least 20
seconds and repeat this procedure from Step 1.
If successful, the new coded key(s) will start the vehicle’s engine and the
theft indicator will illuminate for three seconds and then go out.
If not successful, the new coded key(s) will not start the vehicle’s engine
and the theft indicator will flash on and off. You may repeat Steps 1
through 6. If failure repeats, bring your vehicle to your dealership to
have the new spare key(s) programmed.
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
85
Page 102 of 240

•The parklamps/headlamps are in OFF position (If vehicle is equipped
with Autolamps, this will not affect the procedure.)
To reduce the risk of injury, do not deactivate/activate the Belt
Minder feature while driving the vehicle.
1. Turn the ignition switch to the RUN (or ON) position. (DO NOT
START THE ENGINE)
2. Wait until the safety belt warning light turns off. (Approximately 1–2
minutes)
•Steps 3–5 must be completed within 60 seconds or the procedure will
have to be repeated.
3. Buckle then unbuckle the safety belt three times, ending with the
safety belt unbuckled. This can be done before or during BeltMinder
warning activation.
4. Turn on the parklamps/headlamps, turn off the parklamps/headlamps.
5. Buckle then unbuckle the safety belt three times, ending with the
safety belt unbuckled.
•After step 5 the safety belt warning light will be turned on for three
seconds.
6. Within seven seconds of the safety belt warning light turning off,
buckle then unbuckle the safety belt.
•This will disable BeltMinder if it is currently enabled, or enable
BeltMinder if it is currently disabled.
7. Confirmation of disabling BeltMinder is provided by flashing the safety
belt warning light four times per second for three seconds.
8. Confirmation of enabling BeltMinder is provided by flashing the safety
belt warning light four times per second for three seconds, followed by
three seconds with the safety belt warning light off, then followed by
flashing the safety belt warning light four times per second for three
seconds again.
9. After receiving confirmation, the deactivation/activation procedure is
complete.
2004 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Seating and Safety Restraints
102