sensor FORD EXPEDITION 2003 2.G User Guide

How does the air bag supplemental restraint system work?
The air bag SRS is designed to
activate when the vehicle sustains
longitudinal deceleration sufficient
to cause the sensors to close an
electrical circuit that initiates air
bag inflation.
The fact that the air bags did not
inflate in a collision does not mean
that something is wrong with the
system. Rather, it means the forces
were not of the type sufficient to
cause activation. The driver and passenger airbags are designed to inflate
in frontal and near-frontal collisions, not rollover, side-impact, or
rear-impacts unless the collision causes sufficient longitudinal
deceleration.
The air bags inflate and deflate
rapidly upon activation. After air bag
deployment, it is normal to notice a
smoke-like, powdery residue or
smell the burnt propellant. This may
consist of cornstarch, talcum
powder (to lubricate the bag) or
sodium compounds (e.g., baking
soda) that result from the
combustion process that inflates the
air bag. Small amounts of sodium
hydroxide may be present which
may irritate the skin and eyes, but
none of the residue is toxic.
While the system is designed to help
reduce serious injuries, contact with
a deploying air bag may also cause abrasions, swelling or temporary
hearing loss. Because air bags must inflate rapidly and with considerable
force, there is the risk of death or serious injuries such as fractures,
facial and eye injuries or internal injuries, particularly to occupants who
are not properly restrained or are otherwise out of position at the time
of air bag deployment. Thus, it is extremely important that occupants be
properly restrained as far away from the air bag module as possible while
maintaining vehicle control.
Seating and Safety Restraints
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Several air bag system components get hot after inflation. Do not
touch them after inflation.
If the air bag has deployed,the air bag will not function
again and must be replaced immediately.If the air bag is not
replaced, the unrepaired area will increase the risk of injury in a
collision.
The SRS consists of:
•driver and passenger air bag modules (which include the inflators and
air bags),
•one or more impact and safing sensors and diagnostic monitor (RCM),
•a readiness light and tone
•the electrical wiring which connects the components.
The RCM (restraints control module) monitors its own internal circuits
and the supplemental air bag electrical system warning (including the
impact sensors, the system wiring, the air bag system readiness light, the
air bag back up power and the air bag ignitors).
Determining if the system is operational
The SRS uses a readiness light in the instrument cluster or a tone to
indicate the condition of the system. Refer toAir bag readinesssection
in theInstrument clusterchapter. Routine maintenance of the air bag is
not required.
A difficulty with the system is indicated by one or more of the following:
•The readiness light will either
flash or stay lit.
•The readiness light will not
illuminate immediately after ignition is turned on.
•A series of five beeps will be heard. The tone pattern will repeat
periodically until the problem and/or light are repaired.
If any of these things happen, even intermittently, have the SRS serviced
at your dealership or by a qualified technician immediately. Unless
serviced, the system may not function properly in the event of a
collision.
Seating and Safety Restraints
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How does the Safety Canopy
system work?
The design and development of the
Safety Canopysystem included
recommended testing procedures
that were developed by a group of
automotive safety experts known as
the Side Air Bag Technical Working
Group. These recommended testing
procedures help reduce the risk of
injuries related to the deployment of
side airbags (including the Safety
Canopy).
The Safety Canopysystem
consists of the following:
•An inflatable nylon curtain with a
gas generator concealed behind
the headliner and above the doors
(one on each side of vehicle).
•A headliner designed to flex open
above the side doors to allow Safety Canopydeployment.
•The same warning light, electronic control and diagnostic unit as used
for the front airbags.
•Two crash sensors mounted in the front doors (one on each side).
•Two crash sensors located at the c-pillar behind the rear doors (one
on each side).
•Rollover sensor in the restraints control module (RCM).
The Safety Canopysystem, in combination with seat belts, can help
reduce the risk of severe injuries in the event of a significant side impact
collision or rollover event.
Children 12 years old and under should always be properly restrained in
the second or third row seats. The Safety Canopywill not interfere
with children restrained using a properly installed child or booster seat
because it is designed to inflate downward from the headliner above the
doors along the side window opening.
The Safety Canopysystem is designed to activate when the vehicle
sustains lateral deceleration sufficient to cause the side crash sensor to
close an electrical circuit that initiates Safety Canopyinflation or when
a certain likelihood of a rollover event is detected by the rollover sensor.
Seating and Safety Restraints
174

Do not alter or modify your vehicle’s suspension or steering; the
resulting changes to the vehicle’s handling can adversely affect
the AdvanceTracsystem. Also, do not install a stereo
loudspeaker near the front center console or under either front
seat. The speaker vibrations can adversely affect the
AdvanceTracsensors located in this area.
Aggressive driving in any road conditions can cause you to lose
control of your vehicle increasing the risk of severe personal
injury or property damage. The occurrence of an AdvanceTracevent
is an indication that at least some of the tires have exceeded their
ability to grip the road and that you may lose control of the vehicle. If
you experience a severe road event, SLOW DOWN.
If you find yourself regularly experiencing AdvanceTracevents,
you are driving too fast for conditions, you should reduce your
speed, and drive less aggressively. It is always possible to lose control
of a vehicle due to inappropriate driving habits under severe
conditions. The occurrence of an AdvanceTracevent is an indication
that at least some of the tires have exceeded their ability to grip the
road; this may cause you to lose control of the vehicle increasing the
risk of severe personal injury or property damage.
AUTOMATIC TRANSMISSION OPERATION
Brake-shift interlock
This vehicle is equipped with a park/brake-shift interlock feature that
prevents the gearshift lever from being moved from P (Park) when the
ignition is in the ON position unless brake pedal is depressed.
If you cannot move the gearshift lever out of P (Park) with ignition in
the ON position and the brake pedal depressed, or when the ignition is
in the OFF position:
1. Apply the parking brake, turn the ignition to OFF, then remove the
key.
2. Push the tilt steering lever down and tilt the steering column all the
way up.
Driving
202

Always keep the sensors (located on the rear bumper/fascia) free
from dirt, snow and ice (do not clean the sensors with sharp
objects). These elements may cause the system to operate
inaccurately.
If the vehicle sustains damage to the rear bumper/fascia, leaving
it misaligned or bent, the sensing zone may be altered causing
inaccurate measurement of obstacles or false alarms.
CONTROL TRAC FOUR-WHEEL DRIVE (4X4) OPERATION
(IF EQUIPPED)
For important information regarding safe operation of this type
of vehicle, seePreparing to drive your vehiclein this chapter.
If equipped with the Control Trac 4x4 System, and 4L (4x4 LOW)
is selected while the vehicle is moving, the system will not
engage. This is normal and should be no reason for concern.
Before 4L (4x4 LOW) can be engaged, the vehicle must be
brought to a complete stop, the brake pedal depressed and the
transmission placed in N (Neutral).
The vehicle should not be operated in 4H (4x4 HIGH) or 4L (4x4 LOW)
on dry pavement. Doing so could result in difficult disengagement of the
transfer case, increased tire wear, decreased fuel economy and may
damage driveline components.
Your 4x4 features the heavy-duty Control Trac system which includes a
computer-operated transfer case. This unique system is interactive with
the road, continually monitoring and adjusting torque delivery to the
front and rear wheels to optimize vehicle control.
System indicator lights
The Control Trac system indicator lights illuminate only under the
following conditions. If these lights illuminate when driving in 2H or
A4WD, contact your Ford dealer as soon as possible.
•4X4 HIGH- momentarily
illuminates when the vehicle is
started. Illuminates when 4H is
selected.
4x4
HIGH
Driving
208

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
R05 T/T battery
charge relayTT 7 wire connector, Battery charge
R06 Front blower
relayBlower motor, Blower motor speed control
(EATC)
R201 T/T park
lamp relayTrailer tow park lamps feed
R202 Fog lamp
relayFront fog lamps
R203 PCM relay Fuse # 32, Fuse # 33, Fuse # 34, Fuel
pump relay, PCM solenoids and sensors
R301 T/T back-up
lamp relayBack-up lamps, TT connector (back-up
lamps), Electrochromic mirror
R302 Speed
control relayElectric cooling fan clutch, Speed control
servo
R303 Fuel pump
relayFuel pump shut-off switch, PCM fuel
pump monitor, Fuel pump
R304 Battery
saver relayRail lamps, Vanity mirror lamps, Dome
lamp, Glove box lamp, Instrument cluster
R305 Horn relay Dual note horn
* Mini Fuses ** Maxi Fuses
CHANGING THE TIRES
If you get a flat tire while driving, do not apply the brake heavily.
Instead, gradually decrease your speed. Hold the steering wheel firmly
and slowly move to a safe place on the side of the road.
The use of tire sealants is not recommended and may compromise the
integrity of your tires. The use of tire sealants may also affect your tire
pressure monitoring system (if equipped).
Spare tire information
Your vehicle is equipped with a spare tire that may be used as a spare or
a regular tire. The spare is identical to the other tires on your vehicle,
although the wheel may not match.
Roadside Emergencies
236

Make sure that all replacement tires are of the same size, type,
load-carrying capacity and tread design (e.g.,“All Terrain”,
“Touring”, etc.), as originally offered by Ford.
Do not replace your tires with“high performance”tires or larger
size tires.
Failure to follow these precautions may adversely affect the
handling of the vehicle and make it easier for the driver to lose
control and roll over.
Tires that are larger or smaller than your vehicle’s original tires may also
affect the accuracy of your speedometer.
Tire pressure monitoring system (TPMS) (if equipped)
The tire pressure monitoring system provides the driver with a warning
message indicating when tire pressure is severely low or high. This
system is a supplement to normal tire maintenance including regular
manual inspections. The device will inform the operator of severe low or
high inflation pressures, but may not illuminate for less severe
discrepancies in inflation pressure.
The system uses radio-frequency pressure sensors to monitor the tire
pressure on all tires including the spare. The sensors transmit the tire
pressure readings to the receiver module located in the vehicle. The
receiver module then transmits the status to the message center. For
more tire warning information, refer to theMessage Centerin the
Driver controlschapter.
This device complies with part 15 of the FCC rules and with RS-210 of
Industry Canada. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device
must accept any interference received, including interference that may
cause undesired operation.
The tire pressure monitoring system is NOT a substitute for
checking tire pressure. The tire pressure should be checked
periodically (at least monthly) using a tire gauge, seeChecking the
tire pressurein this chapter. Failure to properly maintain your tire
pressure could increase the risk of tire failure and the potential for
personal injury.
Maintenance and Specifications
298

Changing tires with TPMS
It is recommended that you always
have your tires serviced by a dealer
or qualified technician.Each tire is
equipped with a tire pressure
sensor mounted on the wheel
inside the tire behind the valve
stem. The tire pressure sensor
must be unbolted from the wheel prior to tire removal. The
sensor can be removed by loosening the nut at the valve stem.
Failure to remove the sensor may damage it.The rubber grommet
(washer) between the wheel and the tire pressure sensor needs to be
replaced when any tire is changed to minimize air leaks.
The tire pressure should be checked periodically (at least monthly) using
a tire gauge, refer toChecking the tire pressurein this chapter.
SNOW TIRES AND CHAINS
Snow tires must be the same size and grade as the tires you
currently have on your vehicle.
The tires on your vehicle have all weather treads to provide traction in
rain and snow. However, in some climates, you may need to use snow
tires and chains.
Follow these guidelines when using snow tires and chains:
•Use only cable type chains or chains offered by Ford as an accessory
or equivalent. Other conventional link type chains may contact and
cause damage to the vehicle’s wheel house and/or body.
•Do not install chains on the front wheels. Chains on the front wheels
may interfere with suspension components.
•Install chains securely, verifying that the chains do not touch any
wiring, brake lines or fuel lines.
•Drive cautiously. If you hear the chains rub or bang against your
vehicle, stop and re-tighten the chains. If this does not work, remove
the chains to prevent damage to your vehicle.
•If possible, avoid fully loading your vehicle.
•Remove the tire chains when they are no longer needed. Do not use
tire chains on dry roads.
•The suspension insulation and bumpers will help prevent vehicle
damage. Do not remove these components from your vehicle when
using snow tires and chains.
Maintenance and Specifications
299