Page 10 of 240

WARNING LIGHTS AND CHIMES
Base instrument cluster
Optional instrument cluster
Mach 1 instrument cluster
Warning lights and gauges can alert you to a vehicle
condition that may become serious enough to cause
expensive repairs. A warning light may illuminate
when a problem exists with one of your vehicle’s
functions. Many lights will illuminate when you start
your vehicle to make sure the bulb works. If any
light remains on after starting the vehicle, have the
respective system inspected immediately.
P! BRAKE
L
0
00000 00
C
E
FH
LH
10 203020 406080100
120
140
160
180
405060 70
80
90
100
11 0
1204
5
6
7 3
2
1
H
THEFT
RPMX1000
FUEL DOORSELECT/RESET
LOW
FUELO/D
OFF AIR
BAGSERVICE
ENGINE
SOON
MPH km/h
ABS
.
CHECK
FUEL
CAP
P! BRAKE
L
0
00000 00
C
E
FH
LH
102040608020 40608010 012 0 14 0
160
180
200
220
240
100
120
140
305070 90
110
13 0
1504
5
6
7
8 3
2
1
H
THEFT
RPMX1000
FUEL DOORSELECT/RESET
LOW
FUELO/D
OFF AIR
BAGSERVICE
ENGINE
SOONCHECK
FUEL
CAP
MPH km/h
ABS
.
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
10
Page 12 of 240

brake indicates low brake fluid level and the brake
system should be inspected immediately by your
servicing dealership.
Driving a vehicle with the brake system
warning light on is dangerous. A significant
decrease in braking performance may occur. It will
take you longer to stop the vehicle. Have the
vehicle checked by your dealer immediately.
Anti-lock brake
system:If the ABS
light stays illuminated
or continues to flash, a
malfunction has been detected, have the system
serviced immediately. Normal braking is still
functional unless the brake warning light also is
illuminated.
Air bag readiness:If
this light fails to
illuminate when
ignition is turned to ON, continues to flash or
remains on, have the system serviced immediately. A
chime will also sound when a malfunction in the
supplemental restraint system has been detected.
Safety belt:Reminds
you to fasten your
safety belt. A chime
will also sound to
remind you to fasten your safety belt.
Charging system:
Illuminates when the
battery is not charging
properly.
Low fuel:Illuminates
when the fuel level in
the fuel tank is at or
near empty. Refer to
Fuel gaugein this chapter).
ABS
AIR
BAG
LOW
FUEL
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
12
Page 14 of 240
GAUGES
Base instrument cluster gauges
Optional instrument cluster gauges
Mach 1 instrument cluster gauges
Speedometer:Indicates the current vehicle speed.
•Base instrument
cluster
P! BRAKE
L C
EFH
LH
10 203020 406080100
120
140
160
180
405060 70
80
90
100
11 0
1204
5
6
7 3
2
1
H
THEFT
RPMX1000
FUEL DOORSELECT/RESET
LOW
FUELO/D
OFF AIR
BAGSERVICE
ENGINE
SOON
MPH km/h
ABS
00000 00.
CHECK
FUEL
CAP
P! BRAKE
0
00000 00
FH
H
102040608020 40608010 012 0 14 0
160
180
200
220
240
100
120
140
305070 90
110
13 0
1504
5
6
7
8 3
2
1
H
THEFT
RPMX1000
FUEL DOORSELECT/RESET
LOW
FUELO/D
OFF AIR
BAGSERVICE
ENGINE
SOON
MPH km/h
ABS
.
L
LCHECK
FUEL
CAP
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Instrument Cluster
14
Page 102 of 240
•Turn the key to 4
(ON) without
turning the key to 5
(START).
Make sure the corresponding lights illuminate or
illuminate briefly. If a light fails to illuminate, have
the vehicle serviced.
•If the driver’s safety belt is fastened, the
light
may not illuminate.
1
2
34
5
P! BRAKE
L
0
00000 00
C
E
FH
LH
10 203020 406080100
120
140
160
180
405060 70
80
90
100
11 0
1204
5
6
7 3
2
1
H
THEFT
RPMX1000
FUEL DOORSELECT/RESET
LOW
FUELO/D
OFF AIR
BAGSERVICE
ENGINE
SOON
MPH km/h
ABS
.
CHECK
FUEL
CAP
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Driving
102
Page 104 of 240

Important ventilating information
If the engine is idling while the vehicle is stopped
for a long period of time, open the windows at least
2.5 cm (one inch) or adjust the heating or air
conditioning to bring in fresh air.
BRAKES
Occasional brake noise is normal. If a metal-to-metal,
continuous grinding or continuous squeal sound is
present, the brake linings may be worn-out and
should be inspected by a qualified service
technician. If the vehicle has continuous vibration or
shudder in the steering wheel while braking, the
vehicle should be inspected by a qualified service
technician.
Refer toBrake system
warning lightin the
Instrument Cluster
chapter for information
on the brake system warning light.
Four-wheel anti-lock brake system (ABS)
(if equipped)
Your vehicle may be equipped with an Anti-lock
Braking System (ABS). This system helps you
maintain steering control during emergency stops by
keeping the brakes from locking. Noise from the
ABS pump motor and brake pedal pulsation may be
observed during ABS braking; any pulsation or
mechanical noise you may feel or hear is normal.
ABS warning lamp
ABS
The ABS lamp in the
instrument cluster
momentarily illuminates
when the ignition is
turned to ON. If the light does not illuminate during
start up, remains on or flashes, the ABS may be
disabled and may need to be serviced.
P!
BRAKE
ABS
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Driving
104
Page 105 of 240

Even when the ABS is
disabled, normal
braking is still effective.
(If your BRAKE
warning lamp illuminates with the parking brake
released, have your brake system serviced
immediately.)
Using ABS
When hard braking is required, apply continuous
force on the brake pedal; do not pump the brake
pedal since this will reduce the effectiveness of the
ABS and will increase your vehicle’s stopping
distance. The ABS will be activated immediately,
allowing you to retain full steering control during
hard braking and on slippery surfaces. However, the
ABS does not decrease stopping distance.
Hydraulic brake booster system (Hydroboost)
(if equipped)
The Hydroboost system receives fluid pressure from
the power steering pump to provide power assist
during braking.
For Hydroboost-equipped vehicles operating under
normal conditions, the noise of the fluid flowing
through the booster may be heard whenever the
brake is applied. This condition is normal; vehicle
service is not required.
If braking performance or pedal response becomes
very poor, even when the pedal is strongly
depressed, it may indicate the presence of air in the
hydraulic system or leakage of fluid. Stop the vehicle
safely as soon as possible and seek service
immediately.
P!
BRAKE
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Driving
105
Page 127 of 240
Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment
Fuse Panel Description
11 15A Back-up lamps
12 2A Heated PCV
13 15A Electronic flasher
14—Not used
15 15A Power lumbar
16—Not used
17 15A Speed control servo, Shift
lock actuator
18 15A Electronic flasher
19 15A Power mirror switch, GEM,
Anti-theft relay, Power door
locks, Door ajar switches
20 15A Convertible top switch
21 5A Instrument cluster and
engine control memory
22—Not used
23 15A A/C clutch, Defogger switch
24 30A Climate control blower
motor
25 25A Luggage compartment lid
release
26 30A Wiper/Washer motor, Wiper
relays
27 20A Radio
28 15A GEM, Overdrive cancel
switch
29 15A Anti-lock Brake System
(ABS) module
30 15A Daytime Running Lamps
(DRL) module
31 10A Data link connector
32 15A Radio, GEM
33 15A Stop lamp switch, Speed
control deactivation switch
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
127
Page 128 of 240

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment
Fuse Panel Description
34 20A Instrument Cluster, CCRM,
Data link connector,
Securilock transceiver
module
35 15A Shift lock actuator,
Powertrain Control Module
(PCM), Speed control servo,
ABS module
36 15A Air bag control module
37 5A Adjustable illumination
38 20A High beams
39 5A GEM
40—Not used
41 15A Brake lamp
42—Not used
43 20A CB Power windows
44—Not used
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 theBatterysection of the
Maintenance and specificationschapter.
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Roadside Emergencies
128