wheel size DODGE NITRO 2009 1.G Owners Manual

Driver And Front Passenger Supplemental
Restraint Systems (SRS)This vehicle has airbags for both the driver and right
front passenger as a supplement to the seat belt restraint
systems. The driver’s front airbag is mounted in the
steering wheel. The passenger side airbag is mounted in
the instrument panel, above the glove compartment. The
words SRS/AIRBAG are embossed on the airbag covers.
NOTE:The front airbags are certified to the Federal
regulations that allow less forceful deployment.
The front airbags have a multistage inflator design. This
may allow the airbag to have different rates of inflation
that are based on collision severity and occupant size.
Also, the front passenger airbag is certified to the Federal
regulations that define Occupant Classification (Refer to
Occupant Classification Systemin this section).
Front Airbag Components
1 — Driver Airbag
2 — Passenger Airbag 48 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE

•Occupant Classification System (OCS) — Front Pas-
senger Seat Only
Occupant Classification Module
Passenger Airbag Disable (PAD) Indicator Light
Weight Sensors
How The Airbag System Works
•
TheOccupant Restraint Control (ORC) modulede-
termines if a frontal, side, or rollover collision is severe
enough to require the airbags to inflate. The front
airbag inflators are designed to provide different rates
of airbag inflation from direction provided by the
ORC. The ORC may also modify the rate of inflation
based on the occupant size provided by the Occupant
Classification module. The ORC will detect roll over,
but not rear impacts.The ORC also monitors the readiness of the electronic
parts of the system whenever the ignition switch is in
the START or ON positions. These include all of the
items listed above except the instrument panel, and
the steering wheel and column. If the key is in the
LOCK position, in the ACC position, or not in the
ignition, the airbags are not on and will not inflate.
•Also, the ORC turns on the “Airbag Warn-
ing Light” and “PAD Indicator Light” for six
to eight seconds for a self-check when the
ignition is first turned ON. After the self-
check, the “Airbag Warning Light” will turn off. The
“PAD Indicator Light” will function normally (Refer to
Passenger Airbag Disable (PAD) Indicator Lightin
this section). If the ORC detects a malfunction in any
part of the system, it turns on the “Airbag Warning
Light” either momentarily or continuously. A single
chime will sound if the light comes on again after
initial start up.
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improperly classified. Ensure that the front passenger
seatback does not touch anything placed on the back seat
because this can also affect occupant classification. Also,
if you fold down the rear seat, check to be sure it doesn’t
touch the front passenger seat.
If the front passenger seat is damaged in any way, it
should only be serviced by an authorized dealer. If the
seat is removed (or even if the seat attachment bolts are
loosened or tightened in any way), take the vehicle to an
authorized dealer.
If there is a fault present in the OCS, the “Airbag Warning
Light” (a red light located in the center of the instrument
cluster directly in front of the driver) will be turned on. This
indicates that you should take the vehicle to an authorized
dealer. The “Airbag Warning Light” is turned on whenever
there is a fault that can affect the operation of the airbag
system. If there is a fault present in the OCS, both the “PAD
Indicator Light” and the “Airbag Warning Light” are illumi-
nated to show that the passenger airbag is turned off untilthe fault is cleared. If an object is lodged under the seat and
interferes with operation of the weight sensors, a fault will
occur which turns on both the “PAD Indicator Light” and
the “Airbag Warning Light.” Once the lodged object is
removed, the fault will be automatically cleared after a short
period of time.
•TheDriver and Passenger Airbag/Inflator Unitsare
located in the center of the steering wheel and the right
side of the instrument panel. When the ORC detects a
collision requiring the airbags, it signals the inflator units.
A large quantity of nontoxic gas is generated to inflate the
front airbags. Different airbag inflation rates are possible
based on collision severity and occupant size. The steer-
ing wheel hub trim cover and the upper right side of the
instrument panel separate and fold out of the way as the
bags inflate to their full size. The bags fully inflate in
about 50 to 70 milliseconds. This is about half of the time
it takes to blink your eyes. The bags then quickly deflate
while helping to restrain the driver and front passenger.
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as intended. TPMS malfunctions may occur for a variety
of reasons, including the installation of replacement or
alternate tires or wheels on the vehicle that prevent the
TPMS from functioning properly. Always check the
TPMS malfunction telltale after replacing one or more
tires or wheels on your vehicle, to ensure that the
replacement or alternate tires and wheels allow the TPMS
to continue to function properly.CAUTION!
The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures and
warning have been established for the tire size
equipped on your vehicle. Undesirable system opera-
tion or sensor damage may result when using re-
placement equipment that is not of the same size,
type, and/or style. Aftermarket wheels can cause
sensor damage. Do not use tire sealant from a can, or
balance beads if your vehicle is equipped with a
TPMS, as damage to the sensors may result.
UNDERSTANDING YOUR INSTRUMENT PANEL 183
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When additional traction is required, the transfer case
4WD LOCK position can be used to lock the front and
rear driveshafts together and force the front and rear
wheels to rotate at the same speed. This is accomplished
by rotating the 4WD Control Switch to the desired
position. Refer to “Shifting Procedure” for specific shift-
ing instructions. The 4WD LOCK position is designed for
loose, slippery road surfaces only. Driving in the 4WD
LOCK position on dry hard surfaced roads may cause
increased tire wear and damage to the driveline compo-
nents.
NOTE:Do not attempt to make a shift while only the
front or rear wheels are spinning. Shifting while only the
front or rear wheels are spinning can cause damage to the
transfer case.Proper operation of 4–wheel drive vehicles depends on
tires of equal size, type and circumference on each wheel.
Any difference in tire size can cause damage to the
transfer case.
Since 4–wheel drive provides improved traction, there is
a tendency to exceed safe turning and stopping speeds.
Do not go faster than road conditions permit.
Shifting Procedure - Electronically Shifted
Transfer Case
NOTE:If any of the requirements to select a new
transfer case position have not been met, the transfer case
will not shift. The “4WD” Indicator Light (located in the
display under the tachometer) will flash until all the
requirements for the selected position have been met. To
retry a shift, return the control knob back to the original
position, make certain all shift requirements have been
met, wait five seconds and try the shift again.
276 STARTING AND OPERATING

WARNING!
•Always apply the parking brake fully when leav-
ing your vehicle or it may roll and cause damage or
injury. Also, be certain to leave the transmission in
the PARK position. Failure to do so may allow the
vehicle to roll and cause damage or injury.
•Leaving unattended children in a vehicle is dan-
gerous for a number of reasons. A child or others
could be injured. Do not leave the keys in the
ignition. A child could operate power windows,
other controls, or move the vehicle.
•Be sure the parking brake is fully disengaged
before driving, failure to do so can lead to brake
problems due to excessive heating of the rear
brakes.When parking on a hill, turn the front wheels toward the
curb on a downhill grade and away from the curb on an
uphill grade.
The parking brake should always be applied whenever
the driver is not in the vehicle.
ANTI-LOCK BRAKE SYSTEM
The Anti-Lock Brake System (ABS) is designed to aid the
driver in maintaining vehicle control under adverse
braking conditions. The system operates with a separate
computer to modulate hydraulic pressure, to prevent
wheel lock-up and help avoid skidding on slippery
surfaces.
All vehicle wheels and tires must be the same size and
type, and tires must be properly inflated, to produce
accurate signals for the computer.
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WARNING!
Significant over or under-inflation of tires or mixing
sizes of tires or wheels on the vehicle can lead to loss
of braking effectiveness.
The ABS conducts a low-speed self-test at about 12 mph
(20 km/h). If you have your foot lightly on the brake
while this test is occurring, you may feel slight pedal
movement. The movement can be more apparent on ice
and snow. This is normal.
The ABS pump motor runs during the self-test at 12 mph
(20 km/h) and during an ABS stop. The pump motor
makes a low humming noise during operation, which is
normal.
WARNING!
•Pumping of the Anti-Lock Brakes will diminish
their effectiveness and may lead to an accident.
Pumping makes the stopping distance longer. Just
press firmly on your brake pedal when you need
to slow down or stop.
•The Anti-Lock Brake System (ABS) cannot prevent
the natural laws of physics from acting on the
vehicle, nor can it increase braking or steering
efficiency beyond that afforded by the condition
of the vehicle brakes and tires or the traction
afforded.
•The ABS cannot prevent accidents, including
those resulting from excessive speed in turns,
following another vehicle too closely, or hydro-
planing. Only a safe, attentive, and skillful driver
can prevent accidents.
(Continued)
286 STARTING AND OPERATING

WARNING!
•Do not use a tire, wheel size or rating other than
that specified for your vehicle. Some combinations
of unapproved tires and wheels may change sus-
pension dimensions and performance characteris-
tics, resulting in changes to steering, handling, and
braking of your vehicle. This can cause unpredict-
able handling and stress to steering and suspen-
sion components. You could lose control and have
an accident resulting in serious injury or death.
Use only the tire and wheel sizes with load ratings
approved for your vehicle.
•Never use a tire with a smaller load index or
capacity than what was originally equipped on
your vehicle. Using a tire with a smaller load index
could result in tire overloading and failure. You
could lose control and have an accident.
(Continued)
WARNING! (Continued)
•Failure to equip your vehicle with tires having
adequate speed capability can result in sudden tire
failure and loss of vehicle control.
CAUTION!
Replacing original tires with tires of a different size
may result in false speedometer and odometer read-
ings.
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CAUTION!
•The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures and
warning have been established for the tire size
equipped on your vehicle. Undesirable system
operation or sensor damage may result when us-
ing replacement equipment that is not of the same
size, type, and/or style. Aftermarket wheels can
cause sensor damage. Do not use aftermarket tire
sealants or balance beads if your vehicle is
equipped with a TPMS, as damage to the sensors
may result.
•After inspecting or adjusting the tire pressure,
always reinstall the valve stem cap. This will
prevent moisture and dirt from entering the valve
stem, which could damage the Tire Pressure Moni-
toring Sensor.NOTE:
•The TPMS is not intended to replace normal tire care
and maintenance, or to provide warning of a tire
failure or condition.
•The TPMS should not be used as a tire pressure gauge
while adjusting your tire pressure.
•Driving on a significantly under-inflated tire causes
the tire to overheat and can lead to tire failure.
Under-inflation also reduces fuel efficiency and tire
tread life, and may affect the vehicle’s handling and
stopping ability.
•The TPMS is not a substitute for proper tire mainte-
nance, and it is the driver ’s responsibility to maintain
correct tire pressure using an accurate tire pressure
gauge, even if under-inflation has not reached the
level to trigger illumination of the Tire Pressure Moni-
toring Telltale light.
318 STARTING AND OPERATING

•Seasonal temperature changes will affect tire pressure,
and the TPMS will monitor the actual tire pressure in
the tire.
Base System
The Tire Pressure Monitor System (TPMS) uses wireless
technology with wheel rim mounted electronic sensors to
monitor tire pressure levels. Sensors, mounted to each
wheel as part of the valve stem, transmit tire pressure
readings to the receiver module.
NOTE:It is particularly important for you to check the
tire pressure in all of the tires on your vehicle monthly
and to maintain the proper pressure.
The TPMS consists of the following components:
•Receiver Module
•Four Tire Pressure Monitoring Sensors
•Tire Pressure Monitoring Telltale lightThe matching full-size spare wheel and tire assembly (if
equipped) has a tire pressure monitoring sensor. The
matching full-size spare can be used in place of any of the
four road tires. The TPMS will only monitor the pressure
in the full-size spare when it is used in place of a road
tire. Otherwise, a spare with a pressure below the low-
pressure limit will not cause the Tire Pressure Monitoring
Telltale light to illuminate or the chime to sound.
Tire Pressure Monitoring Low Pressure Warnings
The Tire Pressure Monitoring Telltale light will illu-
minate in the instrument cluster and a chime will
sound when tire pressure is low in one or more of the
four active road tires. Should this occur, you should stop as
soon as possible, check the inflation pressure of each tire on
your vehicle, and inflate each tire to the vehicle’s recom-
mended cold placard pressure value. Once the system
receives the updated tire pressures, the system will auto-
matically update and the Tire Pressure Monitoring Telltale
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