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•Vehicles with trailers should not be parked on a grade.
When parking, apply the parking brake on the tow
vehicle. Put the tow vehicle automatic transmission in
P for Park. Always, block orchockthe trailer wheels.
•GCWR must not be exceeded.
•Total weight must be distributed between the tow
vehicle and the trailer such that the following four
ratings are not exceeded:
1. GVWR
2. GTW
3. GAWR
4. Tongue weight rating for the trailer hitch utilized
(This requirement may limit the ability to always
achieve the 10% to 15% range of tongue weight as a
percentage of total trailer weight).
Towing Requirements—Tires
Do not attempt to tow a trailer while using a compact
spare tire.
Proper tire inflation pressures are essential to the safe
and satisfactory operation of your vehicle. Refer to the
Ti re s–General Information section of this manual on
Tire Pressures for proper tire inflation procedures.
Also, check the trailer tires for proper tire inflation
pressures before trailer usage.
Check for signs of tire wear or visible tire damage
before towing a trailer. Refer to the Tires–General
Information section of this manual on Tread Wear
Indicators for the proper inspection procedure.
When replacing tires refer to the Tires–General Infor-
mation section of this manual on Replacement Tires 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.
STARTING AND OPERATING 255
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Page 258 of 368

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
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
Page 328 of 368

EMISSION CONTROL SYSTEM MAINTENANCE
The“Scheduled”maintenance services, listed inbold
typemust be done at the times or mileages specified to
assure the continued proper functioning of the emission
control system. These, and all other maintenance services
included in this manual, should be done to provide best
vehicle performance and reliability. More frequent main-
tenance may be needed for vehicles in severe operating
conditions such as dusty areas and very short trip
driving.
Inspection and service also should be done any time a
malfunction is suspected.
NOTE:Maintenance, replacement, or repair of the
emission control devices and systems on your vehicle
may be performed by any automotive repair establish-
ment or individual using any automotive part which has
been certified pursuant to U.S. EPA or, in the State of
California, California Air Resources Board regulations.
MAINTENANCE SCHEDULES
NOTE:
•
For 2.7L engines with Federal Certified Emission Con-
trol Systems, and all 6.1L engines, follow Maintenance
Schedule“A”from 0 to 102,000 miles, or Schedule“B”
from 0 to 105,000 miles.
•For 2.7L engines with California Certified Emission
Control Systems, and all 3.5L and 5.7L engines follow
Maintenance Schedule“A”
or“B”from 0 to 120,000
miles.
There are two maintenance schedules that show the
requiredservice for your vehicle.
First is Schedule“B.”It is for vehicles that are operated
under the conditions that are listed below and at the
beginning of the schedule.
Change the automatic transmission fluid and filter every
60,000 miles (100 000 km) if the vehicle is usually
operated under one or more of the conditions marked
with an.
•Day or night temperatures are below 32°F(0°C).
328 MAINTENANCE SCHEDULES
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SCHEDULE“B”
Follow schedule“B”if you usually operate your vehicle
under one or more of the following conditions. Change
the automatic transmission fluid and filter every 60,000
miles (100 000 km) if the vehicle is usually operated
under one or more of the conditions marked with an.
•Day or night temperatures are below 32°F(0°C).
•Stop and go driving.
•Extensive engine idling.
•Driving in dusty conditions.
•Short trips of less than 10 miles (16.2 km).
•More than 50% of your driving is at sustained high
speeds during hot weather, above 90°F (32°C).
•Trailer towing.
•Taxi, police or delivery service (commercial ser-
vices).
•Off-road or desert operation.
•If equipped for and operating with E-85 (ethanol)
fuel.
NOTE:IfANYof these apply to you then change your
engine oil every 3,000 miles (5 000 km) or 3 months,
whichever comes first and follow schedule“B”of the
Maintenance Schedulessection of this manual.
NOTE:IfANYof these apply to you then flush and
replace the engine coolant every 102,000 miles (170 000
km) or 60 months, whichever comes first, and follow
schedule B of theMaintenance Schedulessection of this
manual.
SCHEDULE“B”331
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