2012 JEEP GRAND CHEROKEE ignition

4. Approximately 15 seconds later, one of two things will
happen:
a. The MIL will flash for about 10 seconds and then
return to being fully illuminated until you turn OFF
the ignition or start the engine. This means that your
vehicle’s OBD II system isnot readyand you should
notproceed to the I/M station.
b. The MIL will not flash at all and will remain fully
illuminated until you turn OFF the ignition or start the
engine. This means that your vehicle’s OBD II system
isreadyand you can proceed to the I/M station.
If your OBD II system isnot ready,you should see your
authorized dealer or repair facility. If your vehicle was
recently serviced or had a battery failure or replacement,
you may need to do nothing more than drive your
vehicle as you normally would in order for your OBD II
system to update. A recheck with the above test routine
may then indicate that the system is now ready.Regardless of whether your vehicle’s OBD II system is
ready or not, if the MIL is illuminated during normal
vehicle operation you should have your vehicle serviced
before going to the I/M station. The I/M station can fail
your vehicle because the MIL is on with the engine
running.
REPLACEMENT PARTS
Use of genuine MOPARparts for normal/scheduled
maintenance and repairs is highly recommended to en-
sure the designed performance. Damage or failures
caused by the use of non-MOPARparts for maintenance
and repairs will not be covered by the manufacturer’s
warranty.
DEALER SERVICE
Your authorized dealer has the qualified service person-
nel, special tools, and equipment to perform all service
operations in an expert manner. Service Manuals are
available which include detailed service information for
474 MAINTAINING YOUR VEHICLE

Maintenance-Free Battery
Your vehicle is equipped with a maintenance-free battery.
You will never have to add water, nor is periodic main-
tenance required.
CAUTION!
•Do not use a portable battery booster pack or any
other booster source with a system voltage greater
than 12 Volts or damage to the battery, starter
motor, alternator or electrical system may occur.
•Accessories that can be plugged into the vehicle
power outlets draw power from the vehicle’s bat-
tery, even when not in use (i.e., cellular phones,
etc.). Eventually, if plugged in long enough, the
vehicle’s battery will discharge sufficiently to de-
grade battery life and/or prevent the engine from
starting.
WARNING!
•When temperatures are below the freezing point,
electrolyte in a discharged battery may freeze. Do
not attempt jump-starting because the battery
could rupture or explode and cause personal in-
jury. Battery temperature must be brought above
the freezing point before attempting a jump-start.
•Take care to avoid the radiator cooling fan when-
ever the hood is raised. It can start anytime the
ignition switch is on. You can be injured by
moving fan blades.
•Remove any metal jewelry such as watch bands or
bracelets that might make an inadvertent electrical
contact. You could be seriously injured.
(Continued)
480 MAINTAINING YOUR VEHICLE

WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your exhaust
system. Do not park or operate your vehicle in areas
where your exhaust system can contact anything that
can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may indicate severe
and abnormal catalyst overheating. If this occurs, the
vehicle should be stopped, the engine shut off and the
vehicle allowed to cool. Thereafter, service, including a
tune-up to manufacturer’s specifications, should be ob-
tained immediately.To minimize the possibility of catalyst damage:•Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
•Do not try to start engine by pushing or towing the
vehicle.
•Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing, or for prolonged periods during very rough
idling or malfunctioning operating conditions.
488 MAINTAINING YOUR VEHICLE

Cooling System
WARNING!
•When working near the radiator cooling fan, dis-
connect the fan motor lead or turn the ignition
switch to the OFF position. The fan is temperature
controlled and can start at any time the ignition
switch is in the ON position.
•You or others can be badly burned by hot engine
coolant (antifreeze) or steam from your radiator. If
you see or hear steam coming from under the
hood, do not open the hood until the radiator has
had time to cool. Never try to open a cooling
system pressure cap when the radiator is hot.
Coolant Checks
Check the engine coolant (antifreeze) protection every
12 months (before the onset of freezing weather, where
applicable). If the engine coolant (antifreeze) is dirty orrusty in appearance, the system should be drained,
flushed and refilled with fresh coolant. Check the front of
the A/C condenser for any accumulation of bugs, leaves,
etc. If dirty, clean by gently spraying water from a garden
hose vertically down the face of the condenser.
Check the coolant recovery bottle tubing for brittle rub-
ber, cracking, tears, cuts and tightness of the connection
at the bottle and radiator. Inspect the entire system for
leaks.
With the engine at normal operating temperature (but
not running), check the cooling system pressure cap for
proper vacuum sealing by draining a small amount of
engine coolant (antifreeze) from the radiator drain cock.
If the cap is sealing properly, the engine coolant (anti-
freeze) will begin to drain from the coolant recovery
bottle. DO NOT REMOVE THE COOLANT PRESSURE
CAP WHEN THE COOLING SYSTEM IS HOT.
7
MAINTAINING YOUR VEHICLE 489

Cavity Cartridge
FuseMini
FuseDescription
J10 30 Amp
PinkHeadlamp Wash
Relay Contact
J11 30 Amp
PinkDrive Train Control
Module
J12 30 Amp
PinkRear Defroster
J13 60 Amp
YellowMain Ignition Off
Draw (IOD)
J14 20 Amp
BlueTrailer Tow
Lamps/Park Lamps
J15 40 Amp
GreenFront Cabin Fan/
Blower
J17 40 Amp
GreenStarter Motor Sole-
noidCavity Cartridge
FuseMini
FuseDescription
J18 20 Amp
BluePowertrain Control
Module/Powertrain
Control Module
Transmission Range
J19 60 Amp
YellowRadiator Fan Motor
HI/Radiator Fan
Motor Low
J20 30 Amp
PinkFront Wiper
J21 20 Amp
BlueFront/Rear Washer
Control
J22 25 Amp
NaturalSunroof Module
M1 15 Amp
BlueStop Lamps
506 MAINTAINING YOUR VEHICLE

Cavity Cartridge
FuseMini
FuseDescription
M27 10 Amp
RedIgnition Switch/
Wireless Control
Module/Keyless
Entry Module
M28 15 Amp
BluePowertrain
Controller/
Transmission Con-
troller
M29 10 Amp
RedTire Pressure Moni-
tor – If Equipped
M30 15 Amp
BlueJ1962 Diag Connec-
tor
M31 20 Amp
YellowBackup Lamps
M32 10 Amp
RedOccupant Restraint
ControllerCavity Cartridge
FuseMini
FuseDescription
M33 10 Amp
RedPowertrain
Controller/
Transmission Con-
troller
M34 10 Amp
RedPark Assist
Module/Climate
Control System
Module/Infra Red
Sensor/Compass
Module
M35 15 Amp
BlueLeft Rear
Parklamps
M36 20 Amp
YellowPower Outlet
M37 10 Amp
RedAntilock Brakes/
Stability Control
System Module
7
MAINTAINING YOUR VEHICLE 509

Cavity Cartridge
FuseMini
FuseDescription
M38 25 Amp
NaturalAll Door Lock
&Unlock
CAUTION!
•When installing the totally integrated power mod-
ule cover, it is important to ensure the cover is
properly positioned and fully latched. Failure to
do so may allow water to get into the totally
integrated power module and possibly result in a
electrical system failure.
(Continued)
CAUTION! (Continued)
•When replacing a blown fuse, it is important to
use only a fuse having the correct amperage rating.
The use of a fuse with a rating other than indicated
may result in a dangerous electrical system over-
load. If a properly rated fuse continues to blow, it
indicates a problem in the circuit that must be
corrected.
VEHICLE STORAGE
If you are leaving your vehicle dormant for more than
21 days you may want to take steps to protect your
battery. You may:
•Remove fuse #27 in the Totally Integrated Power
Module (TIPM) labeled Ignition-Off Draw (IOD#1).
•Or, disconnect the negative cable from the battery.
510 MAINTAINING YOUR VEHICLE

Garage Door Opener (HomeLink®)........... 241
Gas Cap (Fuel Filler Cap)............440,443,472
Gasoline (Fuel)......................... 435
Conserving......................... 309
Gasoline, Clean Air...................... 436
Gasoline, Reformulated................... 436
Gauges
Coolant Temperature.................. 292
Fuel.............................. 292
Speedometer........................ 291
Tachometer......................... 284
Gear Ranges........................... 383
Gear Select Lever Override................. 467
General Information............ 18,27,141,222,435
Glass Cleaning.......................... 503
Gross Axle Weight Rating...............444,447
Gross Vehicle Weight Rating.............444,446
GVWR ............................... 444Hands-Free Phone (Uconnect™)............. 111
Hazard
Driving Through Flowing, Rising, or Shallow
Standing Water...................... 394
Hazard Warning Flasher................... 460
Headlights............................ 512
Bulb Replacement.................... 512
On With Wipers..................... 180
Replacing.......................... 512
Heated Mirrors......................... 110
High Beam Indicator..................... 286
Hill Descent Control Indicator............... 286
Hitches
TrailerTowing ....................... 449
Holder,Cup ........................... 264
HomeLink® (Garage Door Opener) Transmitter . . 241
Hood Release.......................... 177
Ignition............................... 14
554 INDEX