2008 JEEP GRAND CHEROKEE spare tire

Defrosters
Check operation by selecting the defrost mode and place
the blower control on high speed. You should be able to
feel the air directed against the windshield. See your
authorized dealer for service if your defroster is inoper-
able.
Safety Checks You Should Make Outside The
Vehicle
Tires
Examine tires for excessive tread wear or uneven wear
patterns. Check for stones, nails, glass, or other objects
lodged in the tread. Inspect for tread cuts or sidewall
cracks. Check wheel nuts for tightness and tires (includ-
ing spare) for proper pressure.
Lights
Have someone observe the operation of all exterior lights
while you work the controls. Check turn signal and high
beam indicator lights on the instrument panel.
Fluid Leaks
Check area under vehicle after overnight parking for fuel,
coolant, oil or other fluid leaks. Also, if gasoline fumes
are detected, the cause should be located and corrected
immediately.
68 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE

12. Tire Pressure Monitoring Telltale Light
Each tire, including the spare (if provided),
should be checked monthly when cold and
inflated to the inflation pressure recommended
by the vehicle manufacturer on the vehicle
placard or tire inflation pressure label. (If your vehicle
has tires of a different size than the size indicated on the
vehicle placard or tire inflation pressure label, you should
determine the proper tire inflation pressure for those
tires.)
As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system (TPMS)
that illuminates a low tire pressure telltale when one or
more of your tires are significantly under-inflated. Ac-
cordingly, when the low tire pressure telltale illuminates,
you should stop and check your tires as soon as possible,
and inflate them to the proper pressure. Driving on a
significantly under-inflated tire causes the tire to over-
heat and can lead to tire failure. Under-inflation alsoreduces fuel efficiency and tire tread life, and may affect
the vehicle's handling and stopping ability.
Please note that the TPMS is not a substitute for proper
tire maintenance, and it is the driver 's responsibility to
maintain correct tire pressure, even if under-inflation has
not reached the level to trigger illumination of the TPMS
low tire pressure telltale.
Your vehicle has also been equipped with a TPMS
malfunction indicator to indicate when the system is not
operating properly. The TPMS malfunction indicator is
combined with the low tire pressure telltale. When the
system detects a malfunction, the telltale will flash for
approximately one minute and then remain continuously
illuminated. This sequence will continue upon subse-
quent vehicle start-ups as long as the malfunction exists.
When the malfunction indicator is illuminated, the sys-
tem may not be able to detect or signal low tire pressure
as intended. TPMS malfunctions may occur for a variety
UNDERSTANDING YOUR INSTRUMENT PANEL 177
4

TIRE SAFETY INFORMATION
Tire Markings
NOTE:
²P (Passenger)-Metric tire sizing is based on U.S. design
standards. P-Metric tires have the letter ªPº molded
into the sidewall preceding the size designation. Ex-
ample: P215/65R15 95H.
²European Metric tire sizing is based on European
design standards. Tires designed to this standard have
the tire size molded into the sidewall beginning with
the section width. The letter9P9is absent from this tire
size designation. Example: 215/65R15 96H
²LT (Light Truck)-Metric tire sizing is based on U.S.
design standards. The size designation for LT-Metric
tires is the same as for P-Metric tires except for the
letters ªLTº that are molded into the sidewall preced-
ing the size designation. Example: LT235/85R16.
²Temporary Spare tires are high-pressure compact
spares designed for temporary emergency use only.
Tires designed to this standard have the letter ªTº
molded into the sidewall preceding the size designa-
tion. Example: T145/80D18 103M.
²High Flotation tire sizing is based on U.S. design
standards and it begins with the tire diameter molded
into the sidewall. Example: 31x10.5 R15 LT.
STARTING AND OPERATING 259
5

Tire Sizing Chart
EXAMPLE:
Size Designation:
P= Passenger car tire size based on U.S. design standards
(....blank....(= Passenger car tire based on European design standards
LT= Light Truck tire based on U.S. design standards
T= Temporary Spare tire
31= Overall Diameter in Inches (in)
215= Section Width in Millimeters (mm)
65= Aspect Ratio in Percent (%)
ÐRatio of section height to section width of tire.
10.5= Section Width in Inches (in)
R= Construction Code
Ð9R9means Radial Construction.
Ð9D9means Diagonal or Bias Construction.
15= Rim Diameter in Inches (in)
260 STARTING AND OPERATING

Tire Loading and Tire Pressure
Tire Placard Location
NOTE:The proper cold tire inflation pressure is listed
on either the face of the driver's door or the driver's side
ªBº pillar.
Tire and Loading Information Placard
This placard tells you important information about the:
1) number of people that can be carried in the vehicle
2) the total weight your vehicle can carry
3) the tire size designed for your vehicle
4) the cold tire inflation pressures for the front, rear,
and spare tires.
Tire Placard Location
Tire and Loading Information
STARTING AND OPERATING 263
5

WARNING!
Overloading of your tires is dangerous. Overloading
can cause tire failure, affect vehicle handling, and
increase your stopping distance. Use tires of the
recommended load capacity for your vehicle. Never
overload them.
TIRES Ð GENERAL INFORMATION
Run Flat Tires
This vehicle is equipped with run flat tires. Although the
tires are designed with a ªrun flatº feature that allows the
vehicle to be driven about 50 miles (80 km) at 55 mph (88
km/h), immediate service should be obtained.
WARNING!
Do not exceed 50 mph (80 km/h) if the ªTire Pressure
Monitoring Telltale Lightº is illuminated. Vehicle
handling and braking may be reduced. You could
have an accident and be severely or fatally injured.
NOTE:The ªrun flatº feature eliminates the need for a
spare tire or jack. This vehicle is not equipped with either
a spare tire or jack.
Tire Pressure
Proper tire inflation pressure is essential to the safe and
satisfactory operation of your vehicle. Three primary
areas are affected by improper tire pressure:
STARTING AND OPERATING 267
5

Cav-
ityCartridge
FuseMini Fuse Description
14 20 Amp
YellowCigar Ltr (R/A)
15 10 Amp
RedTire Pressure Trans-
ducers (R/O)
16 10 Amp
RedSteering Control Mod-
ule (SCM), Diag. Con-
nector, Cluster (B+)
17 15 Amp
BlueFlipper Glass (B+)
19 Spare
(R/S)
20 10 Amp
RedSentry Key Remote
Entry Module
(SKREEM), Cluster
(R/S)Cav-
ityCartridge
FuseMini Fuse Description
21 Spare
(Acc De-
lay)
22 15 Amp
BlueRear Wiper (B+)
24 10 Amp
RedPower Distribution
Center (PDC) Relays,
Final Drive Control
Module (FDCM),
Front Control Module
(FCM) (R/S), A580
(R/S)
25 10 Amp
RedShifter Assy (BTSI),
Trans. Case Switch,
ESP/ABS, Brake Supp
Rly Coil (R/S)
340 MAINTAINING YOUR VEHICLE