2003 Mercury Grand Marquis relay

Seating and Safety Restraints 105
Seating 105
Safety restraints 109
Air bags 124
Child restraints 131
Driving 142
Starting 142
Brakes 146
Traction control 149
Air suspension 151
Transmission operation 151
Vehicle loading 156
Trailer towing 157
Roadside Emergencies 161
Getting roadside assistance 161
Hazard flasher switch 162
Fuel pump shut-off switch 162
Fuses and relays 163
Changing tires 170
Jump starting 175
Wrecker towing 180
Customer Assistance 181
Reporting safety defects (U.S. only) 189
Cleaning 190
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Table of Contents
2

If you cannot move the gearshift lever out of P (Park) with ignition in
the ON position and the brake pedal depressed:
1. Apply the parking brake, turn ignition key to LOCK, then remove the
key.
2. Insert the key and turn it to OFF.Apply the brake pedal and shift
to N (Neutral).
When the key is in the ignition OFF position, the automatic
transmission shift lever can be moved from the P (Park) position
without the brake pedal depressed. To avoid unwanted vehicle
movement, always set the parking brake.
3. Start the vehicle.
If it is necessary to use the above procedure to move the gearshift lever,
it is possible that a fuse has blown or the vehicle’s brakelamps are not
operating properly. Refer toFuses and relaysin theRoadside
emergencieschapter.
Do not drive your vehicle until you verify that the brakelamps
are working.
Always set the parking brake fully and make sure the gearshift is
latched in P (Park). Turn the ignition to the LOCK position and
remove the key whenever you leave your vehicle.
If the parking brake is fully released, but the brake warning lamp
remains illuminated, the brakes may not be working properly.
See your dealer or a qualified service technician.
Driving with a 4–speed automatic transmission
Understanding gearshift positions
To put your vehicle in gear, start the engine, depress the brake pedal,
then move gearshift lever out of P (Park).
Hold the brake pedal down while you move the gearshift lever
from P (Park) to another position. If you do not hold the brake
pedal down, your vehicle may move unexpectedly and injure someone.
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Driving
152

The fuel pump shut-off switch is
located on the left side of the trunk
behind the left rear tail light and the
trunk liner.
Use the following procedure to reset the fuel pump shut-off switch.
1. Turn the ignition to the OFF position.
2. Check the fuel system for leaks.
3. If no fuel leak is apparent, reset the fuel pump shut-off switch by
pushing in on the reset button.
4. Turn the ignition to the ON position. Pause for a few seconds and
return the key to the OFF position.
5. Make a further check for leaks in the fuel system.
FUSES AND RELAYS
Fuses
If electrical components in the
vehicle are not working, a fuse may
have blown. Blown fuses are
identified by a broken wire within
the fuse. Check the appropriate
fuses before replacing any electrical
components.
15
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
163

The fuses are coded as follows.
Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
1 15A Audio, CD changer
2 5A Audio
3 7.5A Mirrors
4 10A Air bags
5 — Not used
6 15A Instrument cluster warning lamps module,
Overdrive control switch, Lighting Control
Module (LCM), A/C clutch
7 10A Driver’s Door Module (DDM), Premium
radio
8 25A Powertrain Control Module (PCM) power
relay, Coil-on plugs, Radio noise capacitor,
Passive Anti-Theft System (PATS)
9 5A Transmission range sensor
10 10A Rear window defrost, Heated mirrors
27 25
26 2423 21
2219
20
18 16
17 1514 12
131030
32
31
28
29
11
97
8653
41
2
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
165

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
11 5A Traction control indicator relay (ABS
w/traction control only)
12 15A Multi-function switch for turn/hazard
lamps
13 5A Radio
14 10A Anti-lock Brake System (ABS), Instrument
Cluster
15 15A Speed control module, LCM, Clock, EATC
blower motor relay, Door lock switch
illumination, Heated seat switch, Moonroof
16 15A Reversing lamps, Shift lock, DRL module,
VAP Steering, Electronic day/night mirror,
Overhead console, Air suspension, Climate
control, Heated seat module, Speed chime
module (GCC only)
17 7.5A Wiper motor
18 — Not used
19 15A Brake lamps
20 — Not used
21 15A LCM for park lamps and interior
illumination, Autolamp/Sunload sensor
22 20A Speed control servo, Multi-function switch
for hazard lamps, Brake on/off switch
23 15A EATC module, Instrument cluster, Clock,
LCM, Interior lamps, Door lock switches
24 10A Left-hand low beam
25 15A Cigar lighter
26 10A Right-hand low beam
27 25A LCM for cornering lamps and high beam
headlamps
28 20A* Power windows, DDM
29 — Not used
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
166

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
30 — Not used
31 — Not used
32 — Not used
* Circuit breaker
Power distribution box
The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle’s main electrical systems from overloads.
Always disconnect the battery before servicing high current
fuses.
Always replace the cover to the power distribution box before
reconnecting the battery or refilling fluid reservoirs
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and specificationschapter.
The high-current fuses are coded as follows.
503
502
501
24
23401
20
19 22
21RELAY
302 RELAY
304 RELAY
303
RELAY
301 207
201 202 203204
209
206
208
205602
601118
114
110
106
102
117
113
109
105
101
116
112
108
104
115
111
107
103
18
16
14
1210
8
6
4
2
17
15
13
119
7
5
3
1
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
167

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
1 25A* Audio
2 20A* Power point
3 25A* Heated seats
4 15A* Horns
5 20A* Fuel pump
6 – Not used
7 25A* Moonroof
8 20A* Driver’s Door Module (DDM)
9 – Not used
10 — Not used
11 20A* Daytime running lamps
12 — Not used
13 — Not used
14 — Not used
15 — Not used
16 — Not used
17 — Not used
18 — Not used
19 15A* Powertrain Control Module (PCM), Fuel
injectors
20 15A* PCM, HEGOs
21 — Not used
22 — Not used
23 — Not used
24 — Not used
101 30A** Ignition switch
102 50A** Cooling fan (engine)
103 40A** Blower motor
104 40A** Heated backlight relay
105 30A** PCM power relay
106 40A** Anti-lock Brake System (ABS)
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
168

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box Description
107 — Not used
108 — Not used
109 – Not used
110 – Not used
111 – Not used
112 50A** Ignition switch
113 50A** Feeds IP fuses 3, 5, 21, 23, 25, 27
114 30A** VAP Steering, Air suspension compressor,
Instrument cluster
115 50A** Ignition switch
116 30A** Wipers
117 – Not used
118 20A** ABS
201 1/2 ISO Horn relay
202 1/2 ISO PCM relay
203 1/2 ISO Fuel pump relay
204 1/2 ISO A/C clutch relay
205 1/2 ISO Traction control switch relay
206 — Not used
207 1/2 ISO Fog lamp relay (Marauder only)
208 1/2 ISO Moonroof relay
209 — Not used
301 Full ISO Blower motor relay
302 Full ISO Starter solenoid relay
303 Full ISO Air suspension relay
304 Full ISO Heated backlight relay
401 — Not used
501 Diode PCM diode
502 — Not used
503 — Not used
601 — Not used
2003 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
169