2003 Mercury Grand Marquis ECU

Introduction 4
Instrument Cluster 10
Warning and control lights 10
Gauges 16
Entertainment Systems 22
AM/FM stereo cassette with CD 22
AM/FM stereo cassette (CD changer compatible) 31
CD changer 40
Climate Controls 46
Manual heating and air conditioning 46
Electronic automatic temperature control 48
Lights 53
Headlamps 53
Turn signal control 56
Bulb replacement 57
Driver Controls 63
Windshield wiper/washer control 63
Steering wheel adjustment 64
Power windows 74
Mirrors 75
Speed control 77
Message center 86
Locks and Security 92
Keys 92
Locks 92
Anti-theft system 94
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Table of Contents
Table of Contents
1

Light remains on:
Temporary malfunctions may cause your light to illuminate. Examples
are:
1. The vehicle has run out of fuel.
2. Poor fuel quality or water in the fuel.
3. The fuel cap may not have been properly installed and securely
tightened.
These temporary malfunctions can be corrected by filling the fuel tank
with high quality fuel of the recommended octane and/or properly
installing and securely tightening the fuel cap. After three driving cycles
without these or any other temporary malfunctions present, the light
should turn off. (A driving cycle consists of a cold engine startup
followed by mixed city/highway driving.) No additional vehicle service is
required.
If the light remains on, have your vehicle serviced at the first available
opportunity.
Light is blinking:
Engine misfire is occurring which could damage your catalytic converter.
You should drive in a moderate fashion (avoid heavy acceleration and
deceleration) and have your vehicle serviced at the first available
opportunity.
Under engine misfire conditions, excessive exhaust temperatures
could damage the catalytic converter, the fuel system, interior
floor coverings or other vehicle components, possibly causing a fire.
Check fuel cap
Illuminates when the fuel cap is not
installed correctly. Check the fuel
cap for proper installation. When
the fuel filler cap is properly
re-installed, the light(s) will turn off
after a period of normal driving. Continuing to operate the vehicle with
the check fuel cap light on, or a mis-installed fuel cap can activate the
Service Engine Soon/Check Enginewarning light.
It may take a long period of time for the system to detect an
improperly installed fuel filler cap.
For more information, refer toFuel filler capin theMaintenance and
specificationschapter.
CHECK
FUEL
CAP
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
11

If you pull too hard on the disc holder, the disc holder may come
completely out of the magazine. If this happens, reinsert the disc holder
back into the magazine while pressing on the lever (A).
5. Line up the CD with the groove
of the disc holder. Ensure that the
label on the CD faces downwards.
6. Press in on the disc holder until it
locks securely into the magazine. If
the disc holders are not fully locked
into the magazine, the unit will not
operate.
Ensure that the disc holder is
evenly inserted and at the same
level as the magazine (A). The unit
will not operate if the disc holder is
not inserted at the same level (B).
A
A
B
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Entertainment Systems
42

5. Pull the bulb from the socket and
push in the new bulb.
6. Install the bulb socket into the
lamp assembly by rotating it
clockwise.
7. Install the lamp assembly on the
vehicle with three nut and washer
assemblies ensuring the washers on
the nuts are flush with the body to prevent water from entering the
trunk.
8. Install the plastic retainer and carefully push the carpet back in to
place.
Replacing license plate lamp bulbs
1. Make sure headlamp switch is in
OFF position, then remove two
screws, grommets and the license
plate lamp assembly from the trunk
lid.
2. Carefully pull the bulb from the
socket and push in the new bulb.
3. Install the lamp assembly on
trunk lid with two grommets,
ensuring the grommets are pushed
all the way in to the trunk lid and secure with two screws.
Replacing backup lamp bulbs
1. Make sure headlamp switch is in
OFF position, then open trunk and
remove bulb socket from the trunk
lid by turning counterclockwise.
2. Pull the bulb straight out of the
socket and push in the new bulb.
3. Install the bulb socket in trunk lid
by turning clockwise.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Lights
61

Storage compartment (if
equipped):Press the OPEN control
to open the storage compartment.
The door will open slightly and can
be moved to full open.
The storage compartment may be
used to secure sunglasses or a
similar object.
Electronic compass display (if equipped)
Compass:The compass display is contained in the overhead console.
The vehicle heading is displayed as one of N, NE, E, SE, S, SW, W and
NW.
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 or on the vehicle may also affect compass
accuracy. Adjustments may need to be made to the zone and calibration
of the compass.
Compass zone adjustment
1. Determine which magnetic zone
you are in by referring to the zone
map.
2. Turn the ignition to the ON
position.
1 2 3
4
5
6 7 8 9 101112 13 14 15
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
65

•To close from the vent position, press and hold the rear portion of the
control.
Do not let children play with the moon roof. They may seriously
hurt themselves.
HOMELINKWIRELESS CONTROL SYSTEM (IF EQUIPPED)
The HomeLinkWireless Control System, located on the overhead
console, provides a convenient way to replace up to three hand-held
transmitters with a single built-in device. This feature will learn the radio
frequency codes of most current transmitters to operate garage doors,
entry gate operators, security systems, entry door locks, and home or
office lighting.
When programming your HomeLinkWireless Control System to
a garage door or gate, be sure that people and objects are out of
the way to prevent potential harm or damage.
Do not use the HomeLinkWireless Control System with any garage
door opener that lacks safety stop and reverse features as required by
U.S. federal safety standards (this includes any garage door opener
model manufactured before April 1, 1982). A garage door which cannot
detect an object, signaling the door to stop and reverse, does not meet
current U.S. federal safety standards. For more information, contact
HomeLinkat:www.homelink.comor1–800–355–3515.
Retain the original transmitter for use in other vehicles as well as for
future programming procedures (i.e. new HomeLinkequipped vehicle
purchase). It is also suggested that upon the sale of the vehicle, the
programmed Homelinkbuttons be erased for security purposes, refer to
Programmingin this section.
Programming
Do not program HomeLinkwith the vehicle parked in the garage.
Note:Some vehicles may require the ignition switch to be turned to the
second (or “ACC”) position for programming and/or operation of the
HomeLink. It is also recommended that a new battery be placed in the
hand-held transmitter of the device being programmed to HomeLinkfor
quicker training and accurate transmission of the radio-frequency signal.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
82

Operating the HomeLinkWireless Control System
To operate, simply press and release
the appropriate HomeLinkbutton.
Activation will now occur for the
trained product (garage door, gate
operator, security system, entry
door lock, or home or office lighting
etc.). For convenience, the
hand-held transmitter of the device
may also be used at any time. In the
event that there are still
programming difficulties, contact
HomeLinkatwww.homelink.comor1–800–355–3515.
Erasing HomeLinkbuttons
To erase the three programmed
buttons (individual buttons cannot
be erased):
•Press and hold the two outer
HomeLinkbuttons until the red
indicator light begins to
flash-after 20 seconds. Release
both buttons. Do not hold for
longer that 30 seconds.
HomeLinkis now in the train (or
learning) mode and can be programmed at any time beginning with step
2inthe“Programming”section.
Reprogramming a single HomeLinkbutton
To program a device to HomeLinkusing a HomeLinkbutton previously
trained, follow these steps:
1. Press and hold the desired HomeLinkbutton.Do NOTrelease the
button.
2. The red indicator light will begin to flash after 20 seconds. Without
releasing the HomeLinkbutton, follow step 2 in the “Programming”
section.
For questions or comments, contact HomeLinkatwww.homelink.com
or1–800–355–3515.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
85

If your vehicle is equipped with a
floor-shift transmission, overdrive
can be deactivated by pressing the
Transmission Control Switch (TCS)
on the gearshift handle.
The O/D OFF indicator light will
illuminate on the instrument cluster.
The transmission will operate in all
gears except overdrive.
To return to normal overdrive mode,
press the Transmission Control Switch again. The O/D OFF will no longer
be illuminated.
When you shut off and re-start your vehicle, the transmission will
automatically return to normal
(Overdrive) mode.
For additional information about the gearshift lever and the transmission
control switch operation refer to theAutomatic Transmission
Operationsection of theDrivingchapter.
INTERIOR TRUNK CONTROL
The remote trunk release control is
located on the driver’s door trim
panel and can be operated at any
time.
You can render the switch
inoperable by locking the button
with your master key.
CELL PHONE USE
The use of Mobile Communications Equipment has become increasingly
important in the conduct of business and personal affairs. However,
drivers must not compromise their own or others’ safety when using
such equipment. Mobile Communications can enhance personal safety
and security when appropriately used, particularly in emergency
situations. Safety must be paramount when using mobile communications
equipment to avoid negating these benefits.
Mobile Communication Equipment includes, but is not limited to cellular
phones, pagers, portable email devices, in vehicle communications
systems, telematics devices and portable two-way radios.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driver Controls
90