2004 JEEP GRAND CHEROKEE tires

Defrosters
Check operation by selecting the defrost mode and place
the blower control on high speed. You should feel the air
directed against the windshield.
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.
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 53
2

Tire Pressure Monitor System Ð If Equipped
The Tire Pressure Monitor (TPM) system uses wireless
technology to monitor tire pressure levels. Sensors,
mounted to each wheel as part of the valve stem transmit
tire pressure readings to a receiver located in the over-
head console.The tire pressure is shown in the Electronic Vehicle
Information Center (EVIC) display. The TPM system
remains active even if it is not displayed in the EVIC.
CAUTION!
The TPM system is designed to monitor your tire
pressure and will not function as a tire pressure
gauge while adjusting the pressure in your tires.
There will be a delay between the instant you adjust
the air pressure in a tire and when the system
updates the display.
NOTE:The TPM system can inform you about a low or
high tire pressure condition, but it does not replace
normal tire maintenance.
The TPM system is not intended to provide you with
notification of rapid pressure loss.
92 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

1. If any tire pressure has exceeded the low or high
pressure (refer to STARTING AND OPERATING Ð
TIRES AND WHEELS), the TPM system will display a
message in the EVIC and sound a chime. It will then go
into the tire pressure display screen and flash the pres-
sure value of the tire that is low or high. This will be
displayed for the rest of the ignition cycle, or until either
the C/T, MENU, STEP, or RESET button is pressed.
NOTE:This display will return 60 seconds after either
the C/T, MENU, STEP, or RESET button is pressed. If a
tire is low or high, you should correct your tire inflation
pressure as soon as possible and inspect all of your tires.
Refer to STARTING AND OPERATING Ð TIRES AND
WHEELS for more details.
Once the low or high tire pressure message has occurred,
it will continue to blink until the tire pressure is cor-
rected.2. If the spare tire pressure has exceeded the low or high
pressure allowed, the TPM system will display a message
in the EVIC for 60 seconds and sound a chime per every
ignition cycle (5 Tire TPM System Only).
NOTE:This message will return every ignition cycle,
until the tire pressures are corrected.
3. When the vehicle is moving and the EVIC cannot
receive a valid sensor signal from the tire pressure
sensors, the TIRE PRESSURE UNAVAILABLE message
will be displayed for 5 seconds along with a chime. The
display will then shift to the individual tire pressure
display screen and display dashes for the tire or tires that
are affected. Once the TIRE PRESSURE UNAVAILABLE
message has been displayed, and valid sensor signals are
received, the EVIC will display the TIRE PRESSURE
NOW AVAILABLE message for 5 seconds along with a
chime. This is meant to inform you when the TPM system
has returned to it's normal operation. This will occur
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 93
3

when valid tire pressure sensor messages have been
received from all 4 road tires. TPM system function is
temporarily unavailable due to external electromagnetic
interference, such as electronic devices or nearby radio or
TV towers.
4. In addition to monitoring the vehicle tires, the TPM
system monitors faults within the system. When any
fault has been set, the TPM system will display TIRE
SENSOR BAD/MISSING. Be sure to inspect your tires for
proper inflation pressure. After you determine that your
tires are properly inflated, see your authorized dealer for
service to diagnose the problem with the TPM system.5. With the 5 Tire TPM System, if a road tire is replaced
by the spare, the TPM system will automatically detect
that the tires have been switched (after the ignition has
been cycled) and display SPARE SWAP DETECTED
along with a chime. This could take up to 10 minutes
with vehicle speed above 25 mph (40 km/h).
6. With the 4 Tire TPM System, if a road tire is replaced
by the spare, the TPM system will display TIRE SENSOR
BAD/MISSING. This is due to the spare tire not being
equipped with a tire pressure sensor. Once the road tire is
repaired and/or installed back on the vehicle with the
proper tire pressure the message will be removed. This
could take up to 10 minutes with vehicle speed above 25
mph (40 km/h).
94 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

TO MEMORY is set to YES) when the remote keyless
entry transmitter is used to unlock the door. Pressing the
STEP button when in this display will select ªYesº or
ªNo.º
Retrain Tire Sensors? (Available with TPM System
Only)
When this feature is selected, the TPM system will start
the retraining procedure (Refer to Training Procedure
below). Pressing the STEP button when in this display
will select ªYesº or ªNo.º Then, press the MENU button
to enter selection.
WARNING!
Death or serious injury can occur if magnetically
sensitive devices are exposed to this magnet. Mag-
nets can affect pacemakers.
NOTE:The tire pressure sensors must be retrained after
rotating the tires or replacing one or more sensors. If a
wheel rotation is not followed by the retrain procedure,
the system will not properly inform you of the correct
vehicle location for a low or high pressure tire.
The following describes how to use this feature:
1. Locate the training magnet under the spare tire
(shaped like a doughnut).
2. Press the MENU button until RETRAIN TIRE SEN-
SORS is displayed.
3. Press the STEP button to select YES to retrain TPM
sensor.
4. Press the MENU button to enter selection.
5. Display will read TRAIN LEFT FRONT TIRE.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 99
3

NOTE:There is a 60 second timer for training the first
tire and a 30 second timer between training the remain-
ing tires. If either of these timers expire, the EVIC will
abort the training procedure.
6. Starting at the left front tire, place the training magnet
over the valve stem until the horn chirps (This takes
approximately 5 seconds).7. Repeat step 6 working clockwise around the vehicle
(Left Front, Right Front, Right Rear, Left Rear, Spare) until
all five TPM sensor positions are trained.
NOTE:The spare tire is only trained with the 5 Tire
TPM System.
100 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

Tire Pressure Display Ð If Equipped
Shows the current pressure of all 4 road tires.
NOTE:Tires heat up during normal driving conditions.
Heat will cause the tire pressure to increase from 2 to 6
psi (14 to 41 kPa) during normal driving conditions. Refer
to ªTire Inflation Pressuresº in Section 5 for additional
information.
Blank Screen
Shows a blank screen. Pressing the C/T button returns to
the compass/temperature display.
Automatic Compass Calibration
This compass is self-calibrating which eliminates the
need to manually set the compass. When the vehicle is
new, the compass may appear erratic and the CAL
symbol will be displayed.
After completing one 360 degree turn, with the vehicle
traveling less than 5 mph (8 km/h), in an area free from
large metal or metallic objects, the CAL symbol will turn
off and the compass will function normally.
Manual Compass Calibration
If the compass appears erratic and the CAL symbol does
not appear, you must manually put the compass into the
ªCalibrationº mode.
104 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

NSelec-TractOperating
Instructions/Precautions................186
NShift Positions........................188
NShifting Procedure....................189
NQuadra-Trac IItOperating
Instructions/Precautions Ð If Equipped.....191
NShift Positions........................192
NShifting Procedure....................193
NQuadra-DrivetSystem Ð If Equipped......194
mVari-Lok Front And Rear Axles Ð If Equipped . . 194
mParking Brake.........................194
mAnti-Lock Brake System..................197
mOn-Road Driving Tips...................199
mOff-Road Driving Tips...................200NWhen To Use 4 Lo (Low) Range...........200
NIn Snow, Mud And Sand................200
NHill Climbing........................200
NTraction Downhill.....................201
NAfter Driving Off-Road.................202
mTire Safety Information...................203
NTire Markings........................203
NTire Identification Number (TIN)..........206
NTire Loading And Tire Pressure...........207
mTires Ð General Information...............211
NTire Inflation Pressures.................212
NHigh Speed Operation.................213
NRadial-Ply Tires......................214
174 STARTING AND OPERATING