2008 JEEP GRAND CHEROKEE battery

At the mileage indicated on the appropriate ªMainte-
nance Schedule,º all belts and tensioner should be
checked for condition. Improper belt tension can cause
belt slippage and failure.
Belts should be inspected for evidence of cuts, cracks,
glazing, or frayed cords and replaced if there is indication
of damage which could result in belt failure. Low gen-
erator belt tension can cause battery failure.
Also check belt routing to make sure there is no interfer-
ence between the belts and other engine components.
Spark Plugs
Spark plugs must fire properly to assure engine perfor-
mance and emission control. New spark plugs should be
installed at the specified mileage. The entire set should be
replaced if there is any malfunction due to a faulty spark
plug. Refer to ªFluids, Lubricants, and Genuine Partsº in
this section for spark plug information.
Engine Air Cleaner Filter
Under normal driving conditions, replace the air filter at
the intervals shown on ªMaintenance Schedule A.º If,
however, you drive the vehicle frequently under dusty or
severe conditions, the filter element should be inspected
periodically and replaced if necessary at the intervals
shown on ªMaintenance Schedule B.º
WARNING!
The air cleaner can provide a measure of protection
in the case of engine backfire. Do not remove the air
cleaner unless such removal is necessary for repair or
maintenance. Make sure that no one is near the
engine compartment before starting the vehicle with
the air cleaner removed. Failure to do so can result in
serious personal injury.
316 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:²Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
²Do not try to start engine by pushing or towing the
vehicle.
²Do 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.
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.
318 MAINTAINING YOUR VEHICLE

CAUTION!
It is essential when replacing the cables on the
battery that the positive cable is attached to the
positive post and the negative cable is attached to the
negative post. Battery posts are marked (+) positive
and negative (-) and identified on the battery case.
Also, if a ªfast chargerº is used while battery is in the
vehicle, disconnect both vehicle battery cables before
connecting the charger to battery. Do not use a ªfast
chargerº to provide starting voltage.
Air Conditioner Maintenance
For best possible performance, your air conditioner
should be checked and serviced by an Authorized Dealer
at the start of each warm season. This service shouldinclude cleaning of the condenser fins and a performance
test. Drive belt tension should also be checked at this
time.
WARNING!
²Use only refrigerants and compressor lubricants
approved by the manufacturer for your air condi-
tioning system. Some unapproved refrigerants are
flammable and can explode, injuring you. Other
unapproved refrigerants or lubricants can cause
the system to fail, requiring costly repairs. Refer
to Section 3 of the Warranty Information Book for
further warranty information.
²The air conditioning system contains refrigerant
under high pressure. To avoid risk of personal
injury or damage to the system, adding refrigerant
or any repair requiring lines to be disconnected
should be done by an experienced repairman.
MAINTAINING YOUR VEHICLE 319
7

Cav-
ityCartridge
FuseMini Fuse Description
18 20 Amp
YellowFront Control Module
(FCM) Batt #1
19 20 Amp
YellowLt Trailer-Tow Stop/
Turn
20 20 Amp
YellowFront Control Module
(FCM) Batt #3
21 20 Amp
YellowRt Trailer-Tow Stop/
Turn
22 30 Amp
PinkFinal Drive Control
Module (FDCM)
MOD
23 50 Amp
RedRadiator Fan
27 15 Amp
BlueIgnition Off Draw
(IOD) #1
28 20 Amp
YellowIgnition Off Draw
(IOD) #2Cav-
ityCartridge
FuseMini Fuse Description
29 10 Amp
RedOccupant Restraint
Controller (ORC) R/S
30 10 Amp
RedOccupant Restraint
Controller (ORC) R/O
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:
²Remove fuse #27 in the Intelligent Power Module
labeled Ignition-Off Draw (IOD#1).
²Or, disconnect the negative cable from the battery.
MAINTAINING YOUR VEHICLE 345
7

Once a Month
²Check the tire pressure and look for unusual wear or
damage.
²Inspect the battery and clean and tighten the terminals
as required.
²Check the fluid levels of the coolant reservoir, brake
master cylinder, and add as needed.
²Check all lights and all other electrical items for correct
operation.At Each Oil Change
²Change the engine oil filter.
²Inspect the exhaust system.
²Inspect brake hoses.
²Check the engine coolant/anti-freeze level, hoses, and
clamps.
358 MAINTENANCE SCHEDULES
8
M
A
I
N
T
E
N
A
N
C
E
S
C
H
E
D
U
L
E
S

Battery............................... 318
Emergency Starting..................... 300
Keyless Transmitter Replacement (RKE)....... 23
Saving Feature (Protection)............... 119
Bearings.............................. 333
Belts, Drive............................ 315
Belts, Seat.............................. 36
Body Mechanism Lubrication............... 321
B-Pillar Location........................ 263
Brake Assist System...................... 136
Brake Control System, Electronic............. 134
Brake System........................... 329
Anti-Lock (ABS)....................134,254
Fluid Check.......................... 331
Hoses.............................. 330
Parking............................. 253
Warning Light........................ 174
Brake/Transmission Interlock............... 247
Break-In Recommendations, New Vehicle........ 66Bulb Replacement.....................346,347
Calibration, Compass..................... 188
Camera, Rear........................... 146
Capacities, Fluid........................ 352
Caps, Filler
Fuel................................ 282
Radiator (Coolant Pressure)............... 326
Car Washes............................ 334
Carbon Monoxide Warning...............66,281
Cargo Area Cover....................... 163
Cargo Area Features...................... 162
Cargo Compartment...................... 162
Light............................... 162
Cargo Light............................ 162
Cargo Load Floor........................ 166
Cargo Tie-Downs........................ 164
Catalytic Converter...................... 317
CD (Compact Disc) Player................. 212
INDEX 387
10

Instrument Panel and Controls.............. 172
Instrument Panel Lens Cleaning............. 337
Integrated Power Module (Fuses)............ 344
Interior Appearance Care.................. 336
Interior Fuses.......................... 338
Interior Lighting........................ 125
Interior Lights.......................122,125
Intermittent Wipers (Delay Wipers)........... 127
Introduction............................. 4
Inverter, Power......................... 159
Jump Starting.......................... 300
Key, Programming........................ 17
Key, Replacement........................ 16
Key, Sentry (Immobilizer)................... 15
Key-In Reminder......................... 15
Keyless Entry System...................... 19
Keys................................. 12Lap/Shoulder Belts....................... 36
LATCH (Lower Anchors and Tether for
CHildren)............................60,61
Lead Free Gasoline...................... 278
Leaks, Fluid............................ 68
Life of Tires............................ 272
Liftgate................................ 32
Liftgate Flipper Glass...................... 33
Liftgate Window Wiper/Washer............. 167
Lights..............................68,119
Airbag............................53,175
Alarm............................... 67
Anti-Lock........................... 175
Automatic Headlights................... 120
Back-Up............................. 350
Battery Saver......................... 119
Brake Assist Warning.................141,180
Brake Warning........................ 174
Bulb Replacement...................... 347
INDEX 393
10

Voltage............................. 181
Load Floor, Cargo....................... 166
Loading Vehicle
Tires ............................... 263
Locks................................. 26
Automatic Door........................ 27
Child Protection........................ 28
Door................................ 26
Power Door........................... 27
Lower Anchors and Tether for CHildren
(LATCH)............................60,61
Lubrication, Body....................... 321
Lumbar Support........................ 106
Maintenance Free Battery.................. 318
Maintenance Procedures................... 311
Maintenance Schedule.................... 356
Schedule ªAº......................... 369
Schedule ªBº......................... 359Maintenance Schedules.................... 356
Malfunction Indicator Light (Check Engine) . . 174,309
Manual, Service......................... 380
Memory Feature (Memory Seat)............. 114
Memory Seat........................... 114
Memory Seats and Radio.................. 114
Methanol............................. 279
Mini-Trip Computer...................... 186
Mirrors................................ 74
Automatic Dimming..................... 74
Electric Powered....................... 76
Electric Remote........................ 76
Exterior Folding........................ 75
Heated.............................. 77
Outside.............................. 75
Vanity............................... 77
Modifications/Alterations, Vehicle............. 8
Monitor, Tire Pressure System............... 275
Mopar Parts.........................310,379
INDEX 395
10