2008 FORD F150 relay

Locks and Security 144
Keys 144
Locks 144
Anti-theft system 155
Seating and Safety Restraints 158
Seating 158
Safety restraints 164
Airbags 183
Child restraints 192
Tires, Wheels and Loading 209
Tire information 211
Tire inflation 213
Tire Pressure Monitoring System (TPMS) 226
Vehicle loading 237
Trailer towing 243
Recreational towing 257
Driving 258
Starting 258
Brakes 264
Traction Control™ 266
Transmission operation 269
Snowplowing 293
Roadside Emergencies 296
Getting roadside assistance 296
Hazard flasher switch 298
Fuel pump shut-off switch 298
Fuses and relays 299
Changing tires 307
Lug nut torque 314
Jump starting 315
Wrecker towing 320
Table of Contents
2
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)

AUXILIARY POWER POINT (12VDC)
Power outlets are designed for accessory plugs only. Do not insert
any other object in the power outlet as this will damage the
outlet and blow the fuse. Do not hang any type of accessory or
accessory bracket from the plug. Improper use of the power
outlet can cause damage not covered by your warranty.
The auxiliary power point is located
on the instrument panel.
Do not use the power point for
operating the cigarette lighter
element (if equipped).
To prevent the fuse from being
blown, do not use the power
point(s) over the vehicle capacity of
12 VDC/180W. If the power point or
cigar lighter socket is not working, a
fuse may have blown. Refer toFuses and relaysin theRoadside
Emergencieschapter for information on checking and replacing fuses.
To have full capacity usage of your power point, the engine is required to
be running (in a safe manner) to avoid unintentional discharge of the
battery. To prevent the battery from being discharged:
•do not use the power point longer than necessary when the engine is
not running,
•do not leave battery chargers, video game adapters, computers and
other devices plugged in overnight or when the vehicle is parked for
extended periods.
An additional auxiliary power point
is located on the lower rear side of
the center console. The power point
is accessible from the rear seats.
Always keep the power point caps
closed when not being used.
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Driver Controls
108

Vehicles with a higher center of gravity such as utility vehicles
and trucks handle differently than vehicles with a lower center
of gravity. Utility vehicles and trucks arenotdesigned for cornering at
speeds as high as passenger cars any more than low-slung sports cars
are designed to perform satisfactorily under off-road conditions. Avoid
sharp turns, excessive speed or abrupt maneuvers in these vehicles.
Failure to drive cautiously could result in an increased risk of loss of
vehicle control, vehicle rollover, personal injury and death.
Loaded vehicles, with a higher center of gravity, may handle
differently than unloaded vehicles. Do not overload your vehicle
and use extra precautions, such as driving at slower speeds, avoiding
abrupt steering changes and allowing for increased stopping distance,
when driving a heavily loaded vehicle. Over-loading or loading the
vehicle improperly can deteriorate handling capability and contribute
to loss of vehicle control and vehicle rollover.
AUTOMATIC TRANSMISSION OPERATION
Brake-shift interlock - column-shift transmission
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 the 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, it is possible that a fuse
has blown or the vehicle’s brakelamps are not operating properly. Refer
toFuses and relaysin theRoadside Emergencieschapter.
If the fuse is not blown, perform the following procedure:
1. Apply the parking brake, turn the ignition to OFF/LOCK, then remove
the key.
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Driving
269

2. Locate the round access plug on
the underside of the steering
column cover.
3. Remove the access plug using a flat head screwdriver, then push the
override button using a flat head screwdriver, apply the brake pedal and
shift the transmission into N (Neutral).
4. Reinstall the access plug cover, start the vehicle and release the
parking brake.
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 OFF/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 authorized dealer.
Brake-shift interlock - floor-shift transmission
This vehicle is equipped with a brake-shift interlock feature that prevents
the gearshift lever from being moved from P (Park) when the ignition is
in the ON position unless the 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, it is possible that a fuse
has blown or the vehicle’s brakelamps are not operating properly. Refer
toFuses and relaysin theRoadside Emergencieschapter.
If the fuse is not blown, perform the following procedure:
1. Apply the parking brake, turn the ignition to LOCK, then remove the
key.
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Driving
270

This switch is located in the front
passenger’s footwell, behind the kick
panel access cover, to the left of the
fuse box. The access cover needs to
be removed to reset the fuel pump
shut-off switch.
To reset the switch:
1. Turn the ignition OFF.
2. Check the fuel system for leaks.
3. If no leaks are apparent, reset the
switch by pushing in on the reset
button.
4. Turn the ignition ON.
5. Wait a few seconds and return
the key to OFF.
6. Make another check for leaks.
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.
Note:Always replace a fuse with one that has the specified amperage
rating. Using a fuse with a higher amperage rating can cause severe wire
damage and could start a fire.
15
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Roadside Emergencies
299

To reinstall the fuse box cover, place the top part of the cover on the
fuse panel, then push the bottom part of the cover until you hear it click
shut. Gently pull on the cover to make sure it is seated properly.
Always disconnect the battery before servicing high current
fuses.
To reduce risk of electrical shock, always replace the cover to
the Power Distribution Box and Auxiliary Relay 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 fuses are coded as follows.
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Roadside Emergencies
301

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse
Panel Description
F01 10A* Run/Accessory - Wipers,
Instrument cluster, Audio for
XL/STX
F02 20A* Stop/Turn lamps, ABS, T/T
electric brake module, PCM (BOO
signal), turn signal mirrors,
CHMSL
F03 7.5A* Power mirrors, Memory seats and
pedals
F04 10A* DVD battery power, Power fold
mirror
F05 7.5A* Keep alive memory for Powertrain
Control Module (PCM) and
Climate control module
F06 15A* Parklamps, Body Security Module
(BSM), Instrument panel
illumination
F07 5A* Radio (start signal)
F08 10A* Heated mirrors, Switch indicator
F09 20A* Fuel pump relay, Fuel injectors,
Injector sense
F10 20A* Trailer tow back-up lamps relay,
Trailer tow parklamp relay
F11 10A* A/C clutch, 4x4 solenoid
F12 5A* PCM relay coil
F13 10A* Climate control module power,
Flasher relay
F14 10A* Back-up lamp and Daytime
Running Lamps (DRL) relay coil,
A/C pressure switch, Redundant
speed control switch, Heated PCV
(5.4L), ABS
F15 5A* Overdrive cancel, Cluster
F16 10A* Brake-shift interlock solenoid
F17 15A* Fog lamp relay
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Roadside Emergencies
302

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse
Panel Description
F18 10A* Electrochromatic mirror, Heated
seats, BSM, Compass, RSS
(Reverse Sensing System), Power
rail
F19 10A* Restraints (Airbag module)
F20 10A* Power rail
F21 15A* Cluster keep alive power
F22 10A* Delayed accessory power for
audio, power door lock switch and
moon roof switch illumination
F23 10A* RH low beam headlamp
F24 15A* Battery saver power for demand
lamps, Flex fuel
F25 10A* LH low beam headlamp
F26 20A* Horn
F27 5A* Passenger Airbag Deactivation
(PAD) warning lamp, Cluster
airbag warning lamp
F28 5A* SecuriLock transceiver (PATS),
PCM IGN monitor
F29 15A* PCM 4x4 power
F30 15A* PCM 4x4 power
F31 20A* Radio power, Satellite radio
module
F32 15A* Vapor Management Valve (VMV),
A/C clutch relay, Canister vent,
Heated Exhaust Gas Oxygen
(HEGO) sensors #11 and #21,
CMCV, Mass Air Flow (MAF)
sensor, Variable Cam Timing
(VCT), Heated Positive Crankcase
Ventilation (PCV) valve (4.2L
engine), CID sensor (4.2L
engine), 4.6L/4.2L EGR
2008 F-150(f12)
Owners Guide (post-2002-fmt)
USA(fus)
Roadside Emergencies
303