2003 FORD EXPEDITION ABS

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.
Brake system warning
To confirm the brake system
warning light is functional, it will
momentarily illuminate when the
ignition is turned to the ON position
(alternatively for some vehicles when the ignition is moved from the ON
position to START position, the light will momentarily illuminate prior to
reaching the START position). It also illuminates if the parking brake is
engaged. If the brake system warning light does not illuminate as
described, seek service immediately. Illumination after the parking brake
is released indicates low brake fluid level or a brake system malfunction
and the brake system should be serviced immediately by a qualified
technician.
Refer toBrakesin theDrivingchapter for more information.
Anti-lock brake system (ABS)
To confirm the anti-lock brake
system (ABS) warning light is
functional it will momentarily
illuminate when the ignition is
turned to the ON position
(alternatively for some vehicles when the ignition is moved from the ON
position to the START position, the light will momentarily illuminate just
prior to reaching the START position). If the light remains on, continues
to flash or fails to illuminate, have the ABS serviced immediately. If the
ABS light remains on, it means the anti-lock brake system has
malfunctioned and is disabled, however, the normal brake system will
still function unless the brake warning light also remains illuminated and
parking brake is off. Refer toBrakesin theDrivingchapter for more
information.
ABS
Instrument Cluster
11

Replacing foglamp bulbs
Handle a halogen headlamp bulb carefully and keep out of
children’s reach. Grasp the bulb only by its plastic base and do
not touch the glass. The oil from your hand could cause the bulb to
break the next time the headlamps are operated.
1. Remove the bulb socket from the
foglamp by turning
counterclockwise.
2. Disconnect the electrical
connector from the foglamp bulb.
3. Connect the new foglamp bulb to the electrical connector.
4. Install the bulb socket in the foglamp turning clockwise.
High-mount brakelamp
To change the high-mount
brakelamp bulbs:
1. Remove the two screws holding
the lamp assembly in place.
2. Pull the lamp assembly straight
out.
3. Remove the wire harness.
4. Depress the four tabs that hold
the light assembly on, one at a time,
and pull the black bulb carrier away
from the lamp.
5. Pull the old bulb out and replace
with the new bulb.
6. Snap the black bulb carrier into
the lamp assembly.
7. Replace the wire harness.
8. Replace the lamp assembly.
Lights
90

BRAKES
Your service brakes are self-adjusting. Refer to the scheduled
maintenance guide for scheduled maintenance.
Occasional brake noise is normal and often does not indicate a
performance concern with the vehicle’s brake system. In normal
operation, automotive brake systems may emit occasional or intermittent
squeal or groan noises when the brakes are applied. Such noises are
usually heard during the first few brake applications in the morning;
however, they may be heard at any time while braking and can be
aggravated by environmental conditions such as cold, heat, moisture,
road dust, salt or mud. If a“metal-to-metal,”“continuous grinding”or
“continuous squeal”sound is present while braking, the brake linings
may be worn-out and should be inspected by a qualified service
technician.
If you are driving down a long or steep hill, shift to a lower gear.
Do not apply your brakes continuously, as they may overheat
and become less effective.
Anti-lock brake system (ABS)
On ABS-equipped vehicles, a noise from the hydraulic pump motor and
pulsation in the pedal may be observed during ABS braking events. Pedal
pulsation coupled with noise while braking under panic conditions or on
loose gravel, bumps, wet or snowy roads is normal and indicates proper
functioning of the vehicle’s anti-lock brake system. The ABS performs a
self-check after you start the engine and begin to drive away. A brief
mechanical noise may be heard during this test. This is normal. If a
malfunction is found, the ABS warning light will come on. If the vehicle
has continuous vibration or shudder in the steering wheel while braking,
the vehicle should be inspected by a qualified service technician.
The ABS operates by detecting the onset of wheel lockup during brake
applications and compensates for this tendency. The wheels are
prevented from locking even when the brakes are firmly applied.
Using ABS
•In an emergency or when maximum efficiency from the four-wheel
ABS is required, apply continuous force on the brake. The four wheel
ABS will be activated immediately, thus allowing you to retain steering
control of your vehicle and, providing there is sufficient space, will
enable you to avoid obstacles and bring the vehicle to a controlled
stop.
Driving
195

•The anti-lock system does not always reduce stopping distance.
Always leave enough room between your vehicle and the vehicle in
front of you to stop.
•We recommend that you familiarize yourself with this braking
technique. However, avoid taking any unnecessary risks.
ABS warning lamp
ABS
TheABSwarning lamp in the instrument cluster momentarily illuminates
when the ignition is turned to the ON position. If the light does not
illuminate momentarily at start up, remains on or continues to flash, the
ABS needs to be serviced.
With the ABS light on, the anti-lock
brake system is disabled and normal
braking is still effective unless the
brake warning light also remains
illuminated with parking brake released. (If your brake warning lamp
illuminates, have your vehicle serviced immediately.)
Brake Assist
The Brake Assist system provides full braking force during panic braking
situations. It detects a rapid application of the brake pedal and
maximizes the amount of brake booster assist, helping the driver to
achieve maximum braking pressure. Once a panic brake application is
detected, the system will remain activated as long as the brake pedal is
depressed. The system is deactivated by releasing the brake pedal.
When the system activates, the brake pedal will travel with very little
effort; this is normal.
Parking brake
Apply the parking brake whenever
the vehicle is parked. To set the
parking brake, press the parking
brake pedal down until the pedal
stops.
Driving
196

If the AdvanceTracsystem is activated and deactivated excessively in a
short period of time, the brake portion of the system will shut down to
allow the brakes to cool down. A limited AdvanceTracfunction using
only engine power reduction will still help control the wheels from
over-spinning. When the brakes have cooled down, the system will again
function normally. Anti-lock braking is not affected by this condition and
will function normally during the cool-down period.
AdvanceTracenhances your vehicle’s stability during maneuvers that
require all available tire traction, like in wet/snowy/icy road conditions
and/or when performing emergency maneuvers. In an emergency
lane-change, the driver will experience better overall vehicle traction,
and have better control of the vehicle.
The AdvanceTracsystem helps the driver maintain steering control if
the vehicle begins to slide excessively left or right or spin out.
AdvanceTracwill attempt to correct the sliding motion by applying
brake force at individual tires and, if necessary, by reducing engine
power.
Driving conditions which may activate AdvanceTracinclude:
•Taking a turn too fast
•Maneuvering quickly to avoid an accident, pedestrian or obstacle
•Hitting a patch of ice
•Changing lanes on a snow-rutted road
•Entering a snow-free road from a snow-covered side street, or vice
versa
•Entering a paved road from a gravel road, or vice versa
•Hitting a curb while turning
•Driving on slick surfaces
•Cornering while towing a heavily loaded trailer (refer toTrailer
Towingin this chapter)
The AdvanceTracsystem automatically turns on when the engine is
started. However, the system does not function when the vehicle is
traveling in R (Reverse) or, if equipped with four-wheel drive, in 4L (4X4
LOW). In R (Reverse) or in 4L (4X4 LOW), ABS and the traction
enhancement feature will continue to function.
Driving
200

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
14 15A* Climate control blend door actuator,
Daytime Running Lamps (DRL) relays,
Digital Transmission Range Sensor (DTRS)
back-up lamp
15 5A* AdvanceTracswitch, Instrument cluster
16 10A* ABS module
17 15A* Foglamps
18 10A* Electrochromic mirror, Auxiliary A/C,
Climate-controlled seats module,
Temperature solenoid, Turn signal flasher,
Sunload sensor, Electronic park brake
relay coil
19 10A* Restraints Control Module (RCM)
20 30A* Air suspension module (air spring
solenoids and height sensors), 4x4 module
21 15A* Instrument cluster (interior lamps),
Interior lamps, Electronic park brake relay,
Tire Pressure Monitoring System (TPMS)
22 10A* Door lock switch illumination, Moonroof
switch illumination, Radio (delayed
accessory signal), Flip window switch
23 10A* RH low beam
24 15A* Battery saver relay, Front map/Dome lamp,
2nd row dome/map lamp, Glove
compartment lamp, Cargo lamp, Rail
lamps, Vanity mirror lamps, Underhood
lamp
25 10A* LH low beam
26 20A* Horn relay, Horns
27 5A* Compass, Reverse sensing system module,
Brake shift interlock (BSI) solenoid,
Overdrive cancel switch, Air suspension
module (Run/Start sense)
Roadside Emergencies
233

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
28 5A* SecuriLock transceiver
29 30A* Trailer tow electric brake controller
30 30A* BSM (door locks), Liftgate glass release
relay, Liftgate glass release motor,
Door/Liftgate locks, Parklamps relay
(BSM), Headlamps relay (BSM), Door
lock/Unlock relay (BSM)
31 25A* Radio
32 15A* CMS, Transmission solenoids
33 20A* Canister vent solenoid, EVR CC, HEGOs,
VMV solenoid, IMTV solenoid, A/C clutch
relay coil
34 20A* PCM, Fuel injectors, Idle air control (IAC)
solenoid, Mass air flow sensor
35 20A* Instrument cluster high beam indicator,
High beam headlamps
36 10A* Trailer tow right turn lamp
37 20A* Cargo area power point
38 25A* Rear wiper motor, Washer pump (rear
window wash)
39 20A* Instrument panel or floor console power
point, Rear console power point
40 20A* Headlamp switch, High beam relay coil, LH
low beam fuse # 25, LH low beam fuse #
23, BSM (autolamps headlamp relay), DRL
41 20A* Cigar lighter, OBD II Connector
42 10A* Trailer tow left turn lamp
101 30A** Starter relay, Starter solenoid
102 30A** Ignition switch, Starter solenoid
103 30A** ABS module (pump motor)
104 30A** LH 3rd row power seat
105 30A** Spare
Roadside Emergencies
234

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse Panel
Description
106 30A** Trailer tow battery charge relay
107 30A** Auxiliary blower relay, Auxiliary blower
motor
108 30A** Power passenger seat switch, Passenger
power lumbar switch
109 30A** Driver seat motor switch, Driver lumbar
switch, Adjustable pedal switch, Memory
module
110 30A** Spare
111 50A** Air suspension solid state relay, Air
suspension compressor
112 30A** ABS module (valves)
113 30A** Front wiper motor, Front washer pump
114 40A** Rear window defrost relay, Heated mirrors
(Fuse # 8)
115 30A** 4x4 module, Transfer case shift motor
116 40A** Front blower relay, Front blower motor
117 30A** RH 3rd row power seat
118 30A** Driver and passenger climate control seat
module
401 30A** Power window circuit breaker, Main
window switch, Window motors, Window
switches, Moonroof module
R01 Starter relay Starter motor solenoid
R02 Delayed
accessory
relayFuse # 22, CB # 401, Power windows,
Switch backlighting, Radio, Moonroof, Flip
windows
R03 Hi-beam
relayFuse # 35, Hi-beam headlamps, Hi-beam
indicator, DRL relays
R04 Rear window
defroster
relayFuse # 8 (heated mirrors), Rear window
defroster
Roadside Emergencies
235