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NOTE:Using the“3”range while operating the vehicle
under heavy operating conditions will improve perfor-
mance and extend transmission life by reducing exces-
sive shifting and heat build up. This action will also
provide better engine braking.
The automatic transmission fluid and filter should be
changed if you REGULARLY tow a trailer for more than
45 minutes of continuous operation. See Schedule“B”in
section 8 of this manual for transmission fluid change
intervals.
NOTE:Check the automatic transmission fluid level
before towing.
Towing Tips—Electronic Speed Control (If
Equipped)
Don’t use in hilly terrain or with heavy loads.
When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
Use speed control in flat terrain and with light loads to
maximize fuel efficiency.
Towing Tips—Autostick (If Equipped)
For vehicles equipped with Autostick. By using the
Autostick modes, and selecting a specific gear range,
frequent shifting can be avoided. The highest gear
range should be selected that allows for adequate
performance. For example, choose“4”if the desired
speed can be maintained. Choose“3”or“2”if needed
to maintain the desired speed.
Extended driving at high RPM should be avoided to
prevent excess heat generation. A reduction in vehicle
speed may be required to avoid extended driving at
high RPM. Return to a higher gear range or vehicle
speed when road conditions and RPM level allows.
Towing Tips—Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
City Driving
When stopped for short periods of time, put transmission
in neutral and increase engine idle speed.
258 STARTING AND OPERATING
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▫Body Lubrication.....................296
▫Windshield Wiper Blades................296
▫Windshield Washers...................297
▫Exhaust System......................297
▫Cooling System.......................298
▫Hoses And Vacuum/Vapor Harnesses.......303
▫Brakes.............................303
▫Brake Fluid Level Check................304
▫Fuel System Hoses....................305
▫Automatic Transmission................306
▫Front And Rear Wheel Bearings...........307
▫Appearance Care And Protection From
Corrosion...........................307
▫Cleaning The Center Console Cup Holders . . . 310
Power Distribution Centers...............311▫Front Power Distribution Center...........311
▫Rear Power Distribution Center...........313
Vehicle Storage........................317
Replacement Light Bulbs................317
Bulb Replacement......................318
▫Low Beam Headlight, High Beam Headlight,
Park/Turn Light, And Front Sidemarker
Light..............................318
▫Backup Light, Side Marker Light, Tail/Turn
Light, And Tail/Stop Light...............320
▫License Light........................322
Fluids And Capacities...................323
Fluids, Lubricants And Genuine Parts.......324
▫Engine.............................324
▫Chassis............................325
278 MAINTAINING YOUR VEHICLE
Page 282 of 368

ONBOARD DIAGNOSTIC SYSTEM—OBD II
Your vehicle is equipped with a sophisticated onboard
diagnostic system called OBD II. This system monitors
the performance of the emissions, engine, and automatic
transmission control systems. When these systems are
operating properly, your vehicle will provide excellent
performance and fuel economy, as well as engine emis-
sions well within current government regulations.
If any of these systems require service, the OBD II system
will turn on the“Malfunction Indicator Light.”It will
also store diagnostic codes and other information to
assist your service technician in making repairs. Al-
though your vehicle will usually be drivable and not
need towing, see your dealer for service as soon as
possible.CAUTION!
Prolonged driving with the“Malfunction Indicator
Light”on could cause further damage to the emis-
sion control system. It could also affect fuel economy
and driveability. The vehicle must be serviced before
any emissions tests can be performed.
If the“Malfunction Indicator Light”is flashing
while the engine is running, severe catalytic con-
verter damage and power loss will soon occur. Im-
mediate service is required.
282 MAINTAINING YOUR VEHICLE
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EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle’s emissions control system.
Failure to pass could prevent vehicle registration.
For states which have an I/M (Inspection and
Maintenance) requirement, this check verifies the
following: the MIL (Malfunction Indicator Light)
is functioning and is not on when the engine is running,
and that the OBD (On Board Diagnostic) system is ready
for testing.
Normally, the OBD system will be ready. The OBD
system maynotbe ready if your vehicle was recently
serviced, if you recently had a dead battery, or a battery
replacement. If the OBD system should be determined
not ready for the I/M test, your vehicle may fail the test.
Your vehicle has a simple ignition key actuated test
which you can use prior to going to the test station. To
check if your vehicle’s OBD system is ready, you must do
the following:
1. Insert your ignition key into the ignition switch.2. Turn the ignition to the ON position, but do not crank
or start the engine.
3. If you crank or start the engine, you will have to start
this test over.
4. As soon as you turn your key to the ON position, you
will see your MIL symbol come on as part of a normal
bulb check.
5. 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 key or start the engine. This means that
your vehicle’s OBD system isnot readyand you
shouldnotproceed to the I/M station.
b.
The MIL will not flash at all and will remain fully
illuminated until you turn off the ignition key or start
the engine. This means that your vehicle’s OBD sys-
tem isreadyand you can proceed to the I/M station.
If your OBD system isnot ready,you should see your
authorized dealer or repair facility. If your vehicle was
MAINTAINING YOUR VEHICLE 283
7
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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
should be replaced immediately! Eventual deterioration
of the hose can take place resulting in a possibility of a
burst failure.
WARNING!
Worn brake hoses can burst and cause brake failure.
You could have an accident. If you see any signs of
cracking, scuffing, or worn spots, have the brake
hoses replaced immediately.
Brake Fluid Level Check
The fluid level in the master cylinder should be checked
when performing underhood services, or immediately if
the brake system warning light indicates system failure.
Clean the top of the master cylinder area before removing
the cap. Add fluid to bring the level up to the top of the
“FULL”mark on the side of the master cylinder reservoir.
Overfilling of fluid is not recommended because it may
cause leaking in the system.
Add enough fluid to bring the level up to the require-
ments described on the brake fluid reservoir. With disc
brakes, fluid level can be expected to fall as the brake
pads wear. However, low fluid level may be caused by a
leak and a checkup may be needed.
304 MAINTAINING YOUR VEHICLE
Page 312 of 368
Cavity Fuse Circuits
4 20 Amp
YellowAC Clutch/Horn
5——
6 15 Amp
BlueFront Control Module (FCM)
7 20 Amp
YellowFog Lights
8 15 Amp
BlueLights–License, Park, Side
Marker, Stop, Turn
9 15 Amp
BlueFront Control Module (FCM)
10 5 Amp
OrangePowertrain Control Module
(PCM)/Starter
11 20 Amp
YellowAuto Shutdown/Powertrain
Control Module (PCM)
12——
13——
14 25 Amp
ClearPowertrain Control Module
(PCM)
15 25 Amp
ClearInjectors, Ignition CoilsCavity Fuse Circuits
16——
17 30 Amp
PinkAntilock Brakes System (ABS)
Valves/Powertrain Control
Module (PCM)
18 30 Amp
PinkWindshield Wiper/Washer
19 50 Amp
RedRadiator Fan
20 20 Amp
BlueStarter
21 50 Amp
RedAntilock Brakes System (ABS)
Pump Motor
22 40 Amp
GreenAC Clutch/Radiator Fan High
—Low
23——
24——
25 30 Amp
PinkFront Control Module (FCM)
26 20 Amp
BlueTransmission - RLE
27 30 Amp
PinkFront Control Module (FCM)
312 MAINTAINING YOUR VEHICLE
Page 315 of 368
Cavity Fuse Circuits
13 25 Amp
C/BRKRDoor Modules - except base/
Driver Door Lock Switch -
base/Driver Express Power
Window Switch - if equipped/
Passenger Door Lock Switch -
base
14 10 Amp
RedAC Heater Control/Cluster/
Sentry Key Remote Keyless
Entry
15 20 Amp
YellowTrailer Tow Brake Module - if
equipped
16——
17 20 Amp
YellowCluster
18 20 Amp
YellowSelectable Power Outlet
19 10 Amp
RedStop Lights
20——
21——
22——Cavity Fuse Circuits
23——
24——
25——
26——
27 10 Amp
RedAirbag/Occupant Classifica-
tion Module
28 10 Amp
RedCurtain Airbag - if equipped
29 5 Amp
OrangeAntilock Brakes Module/
Cluster/Front Control Module
(FCM)/Powertrain Control
Module (PCM)/Sentry Key
Remote Keyless Entry/Stop
Lights
30 10 Amp
RedDoor Modules/Power Mirrors
- if equipped/Steering Control
Module
31——
32——
33——
34——
MAINTAINING YOUR VEHICLE 315
7
Page 316 of 368
Cavity Fuse Circuits
35 5 Amp
OrangeAmplifier - if equipped/
Antenna/Ignition Delay/
Overhead Console - if
equipped/Passenger Door
Lock & Express Power Win-
dow Switch - if equipped/
Power Mirrors - if equipped/
Rear Defrost
36 20 Amp
YellowHands Free Phone - if
equipped/Media System
Monitor DVD - if equipped/
Radio/Satellite Receiver - if
equipped
37 15 Amp
BlueTransmission - NAG1
38 5 Amp
OrangeAnalog Clock/Cargo Light/
Overhead Console - if
equipped
39 10 Amp
RedHeated Mirrors - if equippedCavity Fuse Circuits
40 5 Amp
OrangeHeated Seats - if equipped/
Inside Rearview Mirror/
Manual Temperature Control
(early build) - if equipped
41 10 Amp
RedAC Heater Control (except
early build MTC)/Tire Pres-
sure Monitoring - if equipped
42 30 Amp
PinkFront Blower Motor
43 30 Amp
PinkAmplifier - if equipped/
Antenna/Rear Defrost
44 20 Amp
BlueAmplifier - if equipped/Front
Control Module (FCM)/
Sunroof - if equipped
316 MAINTAINING YOUR VEHICLE