Page 92 of 248

KEYS
The vehicle is equipped with a master (black) key and valet (gray) key
lock system. The master key will access doors, trunk, glove box, ignition
and remote trunk release. The valet key will access doors and ignition
only. Before using this key, lock the trunk remote control to disable the
Trunk remote controlon the drivers door, then lock the glove
compartment with your master key.
POWER DOOR LOCKS
Press control to unlock all doors.
Note:When Perimeter Alarm is
armed, this switch is disabled.
Press control to lock all doors.
Smart locks
With the key in any ignition position, and either the driver’s or
passenger’s door open, the doors cannot be locked using the power door
lock switches.
The vehicle may still be locked with the key in the ignition, and
performing one of the following actions:
•Pressing the manual lock button on the door.
•Operating the remote entry transmitter.
•Operating the keyless entry keypad.
•Operating the driver’s door with a key.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
Locks and Security
92
Page 99 of 248

1. Turn the ignition key to ON.
2. Press the power door unlock control on the door panel three times.
3. Turn the ignition key from ON to OFF.
4. Press the power door unlock control three times.
5. Turn the ignition back to ON.
6. The door locks will lock/unlock to confirm programming mode is
entered/active.
7. With the ignition still in the ON position, press the unlock control
once. After a five to ten second delay, the door will lock/unlock to
confirm successful programming.
8. After having waited the necessary time for the programming to
confirm, turn the ignition to OFF.
Once disabled, the autolock feature can be enabled by repeating the
procedure in steps 1–8.
KEYLESS ENTRY SYSTEM (IF EQUIPPED)
With the keyless entry keypad, you
can:
•lock or unlock the vehicle doors
without using the key.
•open the trunk.
•disable/enable autolock.
See alsoRemote entry systemin this chapter for more information.
Your vehicle has a factory-set 5–digit code that operates the keyless
entry system. You can also program your own 5–digit personal entry
code.
The factory-set code is located:
•On the owner’s wallet card in the glove compartment,
•Taped to the computer module, or
•At your dealer.
When using the keyless entry keypad, press the middle of each button in
order to ensure a good activation.
123
45678
90
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
99
Page 100 of 248

Programming your own entry code
1. Enter the factory-set code (keypad will illuminate when pressed).
2. Press the 1/2 control within five
seconds of step 1.
3. Enter your personal 5 digit code.
Enter each digit within five seconds
of the previous one.
All of the vehicle doors will lock and unlock to confirm programming of
the new code.
Do not set a code that includes five of the same number or presents
them in sequential order; these types of codes are easier to figure out.
You can program up to three personal codes to unlock your vehicle.
These codes do not replace the permanent code that the dealership gave
you.
Erasing personal code
To erase all of the personal entry codes programmed to a vehicle:
1. Enter the factory-set code.
2. Press and release 1/2 within 5
seconds of step 1.
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.
123
45678
90
123
45678
90
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Locks and Security
100
Page 241 of 248

Heating
heating and air conditioning
system .................................46, 48
HomeLink universal
transceiver (see Garage
door opener) ...................70, 82, 85
Hood ..........................................197
I
Ignition ...............................142, 231
Infant seats
(see Safety seats) .....................134
Inspection/maintenance (I/M)
testing ........................................219
Instrument panel
cleaning ...................................193
cluster ........................................10
lighting up panel and
interior .......................................54
J
Jack ............................................170
positioning ...............................170
storage .....................................170
Jump-starting your vehicle ......175
K
Keyless entry system .................99
autolock .....................................98
keypad .......................................99
programming entry code .......100
Keys .............................92, 101–103
key in ignition chime ...............16
positions of the ignition .........142L
Lamps
autolamp system .......................53
bulb replacement
specifications chart ..................57
cargo lamps ...............................54
daytime running light ...............53
headlamps .................................53
headlamps, flash to pass ..........54
instrument panel, dimming .....54
interior lamps .....................57–58
replacing bulbs ...................57–62
Lane change indicator
(see Turn signal) ........................56
Lights, warning and indicator ....10
air bag ........................................13
air suspension ...........................14
anti-lock brakes (ABS) ....12, 147
brake ..........................................12
charging system ........................13
check engine .............................10
fuel cap light .............................11
high beam .................................15
low fuel ......................................14
oil pressure ...............................13
overdrive off ..............................14
safety belt .................................13
speed control ............................80
traction control active ..............13
turn signal indicator .................14
Limited slip axle
(see Traction Loc) ....................155
Load limits .................................156
GAWR ......................................156
GVWR ......................................156
trailer towing ..........................156
Locks
autolock .....................................98
childproof ..................................93
doors ..........................................92
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Index
241