2006 JEEP GRAND CHEROKEE ECU

ONLY the correct type thermostat. Other designs may
result in unsatisfactory coolant performance, poor gas
mileage, and increased emissions.
Hoses And Vacuum/Vapor Harnesses
Inspect surfaces of hoses and nylon tubing for evidence
of heat and mechanical damage. Hard or soft spots,
brittle rubber, cracking, tears, cuts, abrasions, and exces-
sive swelling indicate deterioration of the rubber.
Pay particular attention to those hoses nearest to high
heat sources such as the exhaust manifold. Inspect hose
routing to be sure hoses do not come in contact with any
heat source or moving component which may cause heat
damage or mechanical wear.
Insure nylon tubing in these areas has not melted or
collapsed.Inspect all hose connections such as clamps and cou-
plings to make sure they are secure and no leaks are
present.
Components should be replaced immediately if there is
any evidence of wear or damage that could cause failure.
Brake System
In order to assure brake system performance, all brake
system components should be inspected periodically.
Suggested service intervals can be found on the appro-
priate “Maintenance Schedule.” Refer to Section 8 of this
manual.
MAINTAINING YOUR VEHICLE 319
7

WARNING!
Riding the brakes can lead to brake failure and
possibly an accident. Driving with your foot resting
or riding on the brake pedal can result in abnormally
high brake temperatures, excessive lining wear, and
possible brake damage. You wouldn’t have your full
braking capacity in an emergency.
Brake And Power Steering Hoses
When the vehicle is serviced for scheduled maintenance,
inspect surface of hoses and nylon tubing for evidence of
heat and mechanical damage. Hard and brittle rubber,
cracking, tears, cuts, abrasion, and excessive swelling
indicate deterioration of the rubber. Particular attention
should be made to examining those hose surfaces nearest
to high heat sources, such as the exhaust manifold.Insure nylon tubing in these areas has not melted or
collapsed.
Inspect all hose connections such as clamps and cou-
plings to make sure they are secure and no leaks are
present.
NOTE:Often, fluid such as oil, power steering fluid,
and brake fluid are used during assembly plant opera-
tions to facilitate the assembly of hoses to couplings.
Therefore, oil wetness at the hose-coupling area is not
necessarily an indication of leakage. Actual dripping of
hot fluid when systems are under pressure (during
vehicle operation), should be noted before a hose is
replaced based on leakage.
NOTE:Inspection of brake hoses should be performed
whenever the brake system is serviced and at every
engine oil change. Inspect hydraulic brake hoses for
surface cracking, scuffing, or worn spots. If there is any
evidence of cracking, scuffing, or worn spots, the hose
320 MAINTAINING YOUR VEHICLE

Center High Mounted Stop Light (CHMSL)
1. Remove the two screws securing the CHMSL.2. Twist the bulb socket to remove from the CHMSL
housing.
3. Pull the bulb out of the socket.
4. Replace the bulb, reinstall the socket and reattach the
CHMSL.
340 MAINTAINING YOUR VEHICLE

ABS (Anti-Lock Brake System)............177,243
Adding Engine Coolant (Antifreeze).......... 316
Adding Washer Fluid..................... 169
Additives, Fuel......................... 270
Adjustable Pedals....................... 144
Air Conditioner Maintenance............... 309
Air Conditioning Refrigerant............... 310
Air Pressure, Tires....................... 258
Airbag................................ 42
Airbag Deployment....................... 55
Airbag Light.......................57,71,177
Airbag Maintenance....................... 56
Alarm (Security Alarm).................25,178
Alarm System (Security Alarm)............... 25
Alignment and Balance................... 264
Alterations/Modifications, Vehicle............. 8
Antenna, Satellite Radio................... 218
Antifreeze (Engine Coolant)..............315,341
Disposal............................ 317Anti-Lock Brake System (ABS)............131,243
Anti-Lock Warning Light.................. 177
Anti-Theft System.....................25,178
Appearance Care........................ 324
Auto Down Power Windows................ 30
Automatic Dimming Mirror................. 78
Automatic Door Locks..................... 19
Automatic Headlights.................... 121
Automatic Temperature Control (ATC)......... 222
Automatic Transmission.............236,323,324
Adding Fluid......................... 324
Fluid and Filter Changes................. 324
Fluid Change......................... 324
Fluid Level Check...................... 323
Autostick............................. 239
Auxiliary Electrical Outlet (Power Outlet)...... 160
Auxiliary Power Outlet................... 160
Battery............................... 307
374 INDEX

Passing............................. 125
Reading.......................... 119,149
Rear Servicing........................ 339
Rear Tail............................ 339
Seat Belt Reminder..................... 181
Security Alarm (Theft Alarm).............. 178
Service.............................. 335
Service Engine Soon (Malfunction Indicator) . . . 176
Side Marker.......................... 339
SmartBeams.......................... 122
Tire Pressure Monitoring (TPMS)........... 179
Traction Control....................137,178
Turn Signal..................120,124,337,339
Vanity Mirror.......................... 81
Voltage............................. 183
Load Floor, Cargo....................... 167
Loading Vehicle
Tires ............................... 252
Locks................................. 16Automatic Door........................ 19
Child Protection........................ 17
Door................................ 16
Liftgate, Tailgate........................ 16
Power Door........................... 19
Lower Anchors and Tether for CHildren
(LATCH)............................63,65
Lubrication, Body....................... 311
Lumbar Support........................ 106
Maintenance Free Battery.................. 307
Maintenance Procedures................... 300
Maintenance Schedule.................... 346
Schedule “A”......................... 358
Schedule “B”......................... 349
Maintenance Schedules.................... 346
Malfunction Indicator Light (Check Engine) . . 176,298
Manual, Service......................... 370
Memory Feature (Memory Seat)............. 112
382 INDEX

Maintenance........................71,328
Pretensioners.......................... 39
Reminder............................ 181
Shoulder Belt Anchorage.................. 37
Seats................................. 105
Adjustment.......................... 105
Cleaning............................ 327
Easy Entry........................... 115
Head Restraints....................... 107
Heated............................. 108
Lumbar Support....................... 106
Memory............................. 112
Power.............................. 108
Rear Folding......................... 109
Reclining............................ 106
Security Against Theft..................... 16
Security Alarm (Theft Alarm).............25,178
Selection of Coolant (Antifreeze)............. 315
Selection of Oil......................... 303Sentry Key (Immobilizer)................... 13
Sentry Key Programming................... 15
Sentry Key Replacement................... 14
Service Assistance....................... 366
Service Contract......................... 368
Service Engine Soon Light (Malfunction Indicator) . 176
Service Manuals........................ 370
Setting the Clock.....................200,213
Shifting
Automatic Transmission................. 236
Shoulder Belts........................... 33
Signals, Turn...................124,176,337,339
SmartBeams........................... 122
Spark Plugs............................ 305
Speed Control (Cruise Control).............. 146
Speedometer........................... 176
Starting............................... 234
Automatic Transmission................. 234
Cold Weather......................... 235
386 INDEX