2012 JEEP GRAND CHEROKEE inflation pressure

be ON. In this situation, the Tire Pressure Monitoring
Telltale Light will turn OFF only after the tires have been
inflated to the vehicle’s recommended cold tire pressure
value.
CAUTION!
•The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures have
been established for the tire size equipped on your
vehicle. Undesirable system operation or sensor
damage may result when using replacement
equipment that is not of the same size, type, and/or
style. Aftermarket wheels can cause sensor dam-
age. Do not use aftermarket tire sealants or balance
beads if your vehicle is equipped with a TPMS, as
damage to the sensors may result.
(Continued)
CAUTION! (Continued)
•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.
430 STARTING AND OPERATING

•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 gauge, even
if under-inflation has not reached the level to trigger
illumination of the Tire Pressure Monitoring Telltale
Light.
•Seasonal temperature changes will affect tire pressure,
and the TPMS will monitor the actual tire pressure in
the tire.
Premium 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 regularly
check the tire pressure in all of your tires and to maintain
the proper pressure.The Tire Pressure Monitor System (TPMS) consists of the
following components:
•Receiver Module
•Four Tire Pressure Monitoring Sensors
•Various Tire Pressure Monitoring System Messages,
which display in the Electronic Vehicle Information
Center (EVIC), and a graphic displaying tire pressures
•Tire Pressure Monitoring Telltale Light
Tire Pressure Monitoring Low Pressure Warnings
The Tire Pressure Monitoring Telltale Light will
illuminate in the instrument cluster, and an au-
dible chime will be activated, when one or more of
the four active road tire pressures are low. In addition, the
EVIC will display one or more Low Pressure messages
(Left Front, Left Rear, Right Front, Right Rear) for a
minimum of five seconds, and a graphic display of the
pressure value(s) with the low tire(s) “flashing.” Refer to
5
STARTING AND OPERATING 431

Gross Vehicle Weight Rating (GVWR)
The GVWR is the total permissible weight of your vehicle
including driver, passengers, vehicle, options, trailer
tongue weight, and cargo. The label also specifies maxi-
mum capacities of front and rear axle systems (GAWR).
Total load must be limited, so GVWR, and front and rear
GAWR are not exceeded.
Payload
The payload of a vehicle is defined as the allowable load
weight a truck or any given vehicle can carry, including
the weight of the driver, all passengers, options and
cargo.
Gross Axle Weight Rating (GAWR)
The GAWR is the maximum permissible load on the front
and rear axles. The load must be distributed in the cargo
area so that the GAWR of each axle is not exceeded.
Each axle’s GAWR is determined by the components in
the system with the lowest load carrying capacity (axle,springs, tires, or wheels). Heavier axles or suspension
components, sometimes specified by purchasers for in-
creased durability, does not necessarily increase the ve-
hicle’s GVWR.
Tire Size
The tire size on the label represents the actual tire size on
your vehicle. Replacement tires must be equal to the load
capacity of this tire size.
Rim Size
This is the rim size that is appropriate for the tire size
listed.
Inflation Pressure
This is the cold tire inflation pressure for your vehicle for
all loading conditions up to full GAWR.
Curb Weight
The curb weight of a vehicle is defined as the total weight
of the vehicle with all fluids, including vehicle fuel, at full
444 STARTING AND OPERATING

Towing Requirements – Tires

Proper tire inflation pressures are essential to the safe
and satisfactory operation of your vehicle. Refer to
“Tires – General Information” in “Starting and Oper-
ating” for proper tire inflation procedures.
Check the trailer tires for proper tire inflation pres-
sures before trailer usage.
Check for signs of tire wear or visible tire damage
before towing a trailer. Refer to “Tires – General
Information” in “Starting and Operating” for proper
inspection procedure.
When replacing tires, refer to “Tires – General Infor-
mation” in “Starting and Operating” for proper tire
replacement procedures. Replacing tires with a higher
load carrying capacity will not increase the vehicle’s
GVWR and GAWR limits.
Towing Requirements – Trailer Brakes

Donotinterconnect the hydraulic brake system or
vacuum system of your vehicle with that of the trailer.
This could cause inadequate braking and possible
personal injury.
An electronically actuated trailer brake controller is
required when towing a trailer with electronically
actuated brakes. When towing a trailer equipped with
a hydraulic surge actuated brake system, an electronic
brake controller is not required.
Trailer brakes are recommended for trailers over
1,000 lbs (454 kg) and required for trailers in excess of
2,000 lbs (907 kg).
454 STARTING AND OPERATING

Key ............................. 12,14
Ignition Key Removal..................... 14
Illuminated Entry........................ 21
Immobilizer (Sentry Key)................... 16
Infant Restraint........................ 82,83
Inflation Pressure Tires.................... 419
Information Center, Vehicle................. 294
Instrument Cluster....................283,284
Instrument Panel and Controls.............. 282
Instrument Panel Lens Cleaning............. 504
Integrated Power Module (Fuses)............ 504
Interior Appearance Care.................. 503
Intermittent Wipers (Delay Wipers)........... 190
Introduction............................. 4
Inverter, Power......................... 262
Jump Starting.......................... 462
Key-In Reminder......................... 16Key, Programming........................ 18
Key, Replacement........................ 17
Key, Sentry (Immobilizer)................... 16
Keyless Enter-N-Go................. 35,314,376
Keyless Entry System...................... 22
Keyless Go.......................... 12,314
Keys................................. 12
Kicker Sound System..................... 357
Lap/Shoulder Belts....................... 51
LATCH (Lower Anchors and Tether for
CHildren) ............................ 86,87
Latches................................ 99
Lead Free Gasoline...................... 435
Leaks, Fluid............................ 99
LifeofTires ............................ 425
Liftgate................................ 43
Liftgate Flipper Glass...................... 44
Liftgate Window Wiper/Washer............. 274
10
INDEX 555

Tires ............................ 99,418,545
Air Pressure........................ 419
Compact Spare...................... 422
General Information.................. 418
High Speed......................... 420
Inflation Pressures.................... 419
LifeofTires ........................ 425
Load Capacity....................414,415
Pressure Monitor System (TPMS)......... 428
Pressure Warning Light................ 287
Quality Grading..................... 545
Radial............................ 421
Replacement........................ 426
Rotation........................... 427
Safety............................. 408
Sizes ............................. 410
Spinning ........................... 424
Tread Wear Indicators................. 424
Tongue Weight/Trailer Weight.............. 451Tow Hooks, Emergency................... 466
Tow/Haul Indicator Light................. 286
Towing ............................446,468
24-Hour Towing Assistance............. 125
Behind a Motorhome.................. 457
Disabled Vehicle..................... 468
Guide ............................. 450
Recreational........................ 457
Weight ............................ 450
Towing Assistance....................... 125
Towing Vehicle Behind a Motorhome.......... 457
Traction Control......................... 400
Trailer Sway Control (TSC)................. 406
TrailerTowing .......................... 446
Cooling System Tips.................. 456
Hitches............................ 449
Minimum Requirements................ 452
Trailer and Tongue Weight.............. 451
TrailerTowingGuide ..................... 450
10
INDEX 563