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Driving and Operating 255
Warning (Continued)
.Keep children away from
the fuel pump and never let
children pump fuel.
. Fuel can spray out if the fuel
cap is opened too quickly.
This spray can happen if the
tank is nearly full, and is
more likely in hot weather.
Open the fuel cap slowly
and wait for any hiss noise
to stop, then unscrew the
cap all the way.
The fuel cap is behind a hinged fuel
door on the driver side of the
vehicle. To open the fuel door, push
and release the rearward center
edge of the door.
To remove the fuel cap, turn it
slowly counterclockwise. The fuel
cap has a spring in it; if the cap is
released too soon, it will spring back
to the right.
While refueling, hang the fuel cap
from the hook on the fuel door.
{Warning
Overfilling the fuel tank by more
than three clicks of a standard fill
nozzle may cause:
. Vehicle performance issues,
including engine stalling and
damage to the fuel system.
. Fuel spills.
. Potential fuel fires.
Be careful not to spill fuel. Wait a
few seconds after you have finished
pumping before removing the nozzle. Clean fuel from painted
surfaces as soon as possible. See
Exterior Care
0333.
When replacing the fuel cap, turn it
clockwise until it clicks. Make sure
the cap is fully installed. If the cap is
not properly installed, the
malfunction indicator lamp may
come on. See Malfunction Indicator
Lamp (Check Engine Light) 0124.
{Warning
If a fire starts while you are
refueling, do not remove the
nozzle. Shut off the flow of fuel by
shutting off the pump or by
notifying the station attendant.
Leave the area immediately.
Caution
If a new fuel cap is needed, be
sure to get the right type of cap
from your dealer. The wrong type
of fuel cap may not fit properly,
(Continued)

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Driving and Operating 263
Safety Chains
Always attach chains between the
vehicle and the trailer. Cross the
safety chains under the tongue of
the trailer to help prevent the tongue
from contacting the road if it
becomes separated from the hitch.
Always leave just enough slack so
the rig can turn. Never allow safety
chains to drag on the ground.
Trailer Brakes
A loaded trailer that weighs more
than 450 kg (1,000 lb) needs to have
its own brake system that is
adequate for the weight of the
trailer. Be sure to read and follow
the instructions for the trailer brakes
so they are installed, adjusted, and
maintained properly.
Because the vehicle has antilock
brakes, do not try to tap into the
vehicle's hydraulic brake system.
If you do, both brake systems will
not work well, or at all.
Trailer Wiring Harness
Basic Trailer Wiring
The trailer wiring harness, with a
seven-pin connector, is located at
the rear of the vehicle and is tied to
the vehicle's frame. The harness
connector can be plugged into a
seven-pin universal heavy-duty
trailer connector available through
your dealer.
Use only a round, seven-wire
connector with flat blade terminals
meeting SAE J2863 specifications
for proper electrical connectivity.
The seven-wire harness contains
the following trailer circuits:
.Yellow: Left Stop/Turn Signal
. Dark Green: Right Stop/Turn
Signal
. Brown: Taillamps
. Black: Ground
. Light Green: Back-up Lamps
. Red/Black: Battery Feed
. Dark Blue: Trailer Brake* *The fuse for this circuit is installed
in the underhood electrical center,
but the wires are not connected.
They should be connected by your
dealer or a qualified service center.
If the back-up lamp circuit is not
functional, contact your dealer.
To help charge a remote
(non-vehicle) battery, press the Tow/
Haul Mode button at the end of the
shift lever. If the trailer is too light for
Tow/Haul Mode, turn on the
headlamps to help charge the
battery.
Electric Trailer Brake Control
Wiring Provisions
These wiring provisions for an
electric trailer brake controller are
included with the vehicle as part of
the trailer wiring package. The
instrument panel contains blunt cut
wires above the parking brake
assembly for the electric trailer
brake controller. The harness
contains the following wires:
.
Red/Black: Power Supply
. White: Brake Switch Signal

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Vehicle Care 265
Vehicle Care
General Information
General Information . . . . . . . . . . 266
California Proposition65 Warning . . . . . . . . . . . . . . . . . 266
California Perchlorate Materials Requirements . . . . . 266
Accessories and Modifications . . . . . . . . . . . . . . . . 266
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 267
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 268
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 269
Engine Cover . . . . . . . . . . . . . . . . . 270
Engine Oil . . . . . . . . . . . . . . . . . . . . 270
Engine Oil Life System . . . . . . . 273
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . . 274
Engine Air Cleaner/Filter . . . . . . 274
Cooling System . . . . . . . . . . . . . . 275
Engine Coolant . . . . . . . . . . . . . . . 276
Engine Overheating . . . . . . . . . . 279
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . 281
Power Steering Fluid . . . . . . . . . 281
Washer Fluid . . . . . . . . . . . . . . . . . 282 Brakes . . . . . . . . . . . . . . . . . . . . . . . 283
Brake Fluid . . . . . . . . . . . . . . . . . . . 283
Battery - North America . . . . . . 284
All-Wheel Drive . . . . . . . . . . . . . . . 285
Starter Switch Check . . . . . . . . . 285
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 286
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . 286
Park Brake and P (Park) Mechanism Check . . . . . . . . . . 286
Wiper Blade Replacement . . . . 287Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 288
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 288
Taillamps, Turn Signal, and Stoplamps . . . . . . . . . . . . . . . . . . 288
License Plate Lamp . . . . . . . . . . 289
Replacement Bulbs . . . . . . . . . . . 289
Electrical System
High Voltage Devices and Wiring . . . . . . . . . . . . . . . . . . . . . . . 290
Electrical System Overload . . . 290
Fuses and Circuit Breakers . . . 291
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 291 Instrument Panel Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 294
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 297
All-Season Tires . . . . . . . . . . . . . . 297
Winter Tires . . . . . . . . . . . . . . . . . . 298
Summer Tires . . . . . . . . . . . . . . . . 298
Tire Sidewall Labeling . . . . . . . . 299
Tire Designations . . . . . . . . . . . . . 301
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 302
Tire Pressure . . . . . . . . . . . . . . . . . 304
Tire Pressure Monitor System . . . . . . . . . . . . . . . . . . . . . . 305
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . . . . . 306
Tire Inspection . . . . . . . . . . . . . . . . 309
Tire Rotation . . . . . . . . . . . . . . . . . 310
When It Is Time for New Tires . . . . . . . . . . . . . . . . . . . . . . . . 311
Buying New Tires . . . . . . . . . . . . . 311
Different Size Tires and Wheels . . . . . . . . . . . . . . . . . . . . . . 313
Uniform Tire Quality Grading . . . . . . . . . . . . . . . . . . . . . 313
Wheel Alignment and Tire Balance . . . . . . . . . . . . . . . . . . . . . 315
Wheel Replacement . . . . . . . . . . 315
Tire Chains . . . . . . . . . . . . . . . . . . . 316
If a Tire Goes Flat . . . . . . . . . . . . 316

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Vehicle Care 267
safety, including such things as
airbags, braking, stability, ride and
handling, emissions systems,
aerodynamics, durability, and
electronic systems like antilock
brakes, traction control, and stability
control. These accessories or
modifications could even cause
malfunction or damage not covered
by the vehicle warranty.
Damage to suspension components
caused by modifying vehicle height
outside of factory settings will not be
covered by the vehicle warranty.Damage to vehicle components
resulting from modifications or the
installation or use of non-GM
certified parts, including control
module or software modifications, is
not covered under the terms of the
vehicle warranty and may affect
remaining warranty coverage for
affected parts.
GM Accessories are designed to
complement and function with other
systems on the vehicle. See your
dealer to accessorize the vehicle
using genuine GM Accessories
installed by a dealer technician.
Also, see
Adding Equipment to the
Airbag-Equipped Vehicle 082.Vehicle Checks
Doing Your Own
Service Work
{Warning
It can be dangerous to work on
your vehicle if you do not have
the proper knowledge, service
manual, tools, or parts. Always
follow owner manual procedures
and consult the service manual
for your vehicle before doing any
service work.
If doing some of your own service
work, use the proper service
manual. It tells you much more
about how to service the vehicle
than this manual can. To order the
proper service manual, see Service
Publications Ordering
Information 0368.
This vehicle has an airbag system.
Before attempting to do your own
service work, see Servicing the
Airbag-Equipped Vehicle 082.

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270 Vehicle Care
1. Remote Negative (−) Terminal.See Jump Starting - North
America 0326.
2. Engine Compartment Fuse
Block 0291.
3. Radiator Pressure Cap (Out of View). See Cooling
System 0275.
4. Engine Coolant Recovery Cap. See Cooling System 0275.
5. Remote Positive (+) Terminal. See Jump Starting - North
America 0326.
6. Power Steering Reservoir and Cap (Under Engine Cover).
See Power Steering
Fluid 0281.
7. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0270.
8. Engine Oil Dipstick (Out of View). See “Checking Engine
Oil” under Engine Oil 0270.
9. Engine Cooling Fans (Out of View). See Cooling
System 0275.
10. Engine Cover 0270. 11. Brake Fluid Reservoir. See
Brake Fluid 0283.
12. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer
Fluid 0282.
13. Engine Air Cleaner/Filter 0274.
Engine Cover
1. Oil Fill Cap
2. Engine Cover
To remove:
1. Remove the oil fill cap (1). 2. Raise the engine cover (2) to
release it from the retainers.
3. Lift and remove the engine cover.
4. Reverse Steps 1–3 to reinstall engine cover.
Engine Oil
To ensure proper engine
performance and long life, careful
attention must be paid to engine oil.
Following these simple, but
important steps will help protect
your investment:
.Use engine oil approved to the
proper specification and of the
proper viscosity grade. See
“Selecting the Right Engine Oil”
in this section.
. Check the engine oil level
regularly and maintain the
proper oil level. See “Checking
Engine Oil” and“When to Add
Engine Oil” in this section.
. Change the engine oil at the
appropriate time. See Engine Oil
Life System 0273.

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Vehicle Care 273
trash or pouring it on the ground,
into sewers, or into streams or
bodies of water. Recycle it by taking
it to a place that collects used oil.
Engine Oil Life System
When to Change Engine Oil
This vehicle has a computer system
that indicates when to change the
engine oil and filter. This is based
on a combination of factors which
include engine revolutions, engine
temperature, and miles driven.
Based on driving conditions, the
mileage at which an oil change is
indicated can vary considerably. For
the oil life system to work properly,
the system must be reset every time
the oil is changed.
When the system has calculated
that oil life has been diminished, it
indicates that an oil change is
necessary. A CHANGE ENGINE
OIL SOON message comes on.
Change the oil as soon as possible
within the next 1 000 km (600 mi).
It is possible that, if driving under
the best conditions, the oil life
system might indicate that an oilchange is not necessary for up to a
year. The engine oil and filter must
be changed at least once a year
and, at this time, the system must
be reset. Your dealer has trained
service people who will perform this
work and reset the system. It is also
important to check the oil regularly
over the course of an oil drain
interval and keep it at the proper
level.
If the system is ever reset
accidentally, the oil must be
changed at 5 000 km (3,000 mi)
since the last oil change.
Remember to reset the oil life
system whenever the oil is changed.
How to Reset the Engine Oil
Life System
Reset the system whenever the
engine oil is changed so that the
system can calculate the next
engine oil change. To reset the
system:
If the vehicle does not have Driver
Information Center (DIC) buttons:
1. Turn the ignition to ON/RUN,
with the engine off. The vehicle
must be in P (Park) to access
this display. Press the trip
odometer reset stem until OIL
LIFE REMAINING displays.
2. Press and hold the trip odometer reset stem until OIL
LIFE REMAINING shows
“100%.” Three chimes sound
and the CHANGE ENGINE OIL
SOON message goes off.
3. Turn the key to LOCK/OFF.
If the CHANGE ENGINE OIL
SOON message comes back
on when the vehicle is started,
the engine oil life system has
not been reset. Repeat the
procedure.
If the vehicle has Driver Information
Center (DIC) buttons:
1. Turn the ignition to ON/RUN, with the engine off.
2. Press the vehicle information button until OIL LIFE
REMAINING displays.

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274 Vehicle Care
3. Press and hold the set/resetbutton until “100%”is
displayed. Three chimes sound
and the CHANGE ENGINE OIL
SOON message goes off.
4. Turn the key to LOCK/OFF.
If the CHANGE ENGINE OIL SOON
message comes back on when the
vehicle is started, the engine oil life
system has not been reset. Repeat
the procedure.
Automatic Transmission
Fluid
It is not necessary to check the
transmission fluid level.
A transmission fluid leak is the only
reason for fluid loss. If a leak
occurs, take the vehicle to the
dealer and have it repaired as soon
as possible.
Change the fluid at the intervals
listed in Maintenance Schedule
0 344, and be sure to use the
transmission fluid listed in
Recommended Fluids and
Lubricants 0353.
Caution
Use of the incorrect automatic
transmission fluid may damage
the vehicle, and the damage may
not be covered by the vehicle
warranty. Always use the
automatic transmission fluid listed
in Recommended Fluids and
Lubricants 0353.
The transmission fluid will not reach
the end of the dipstick unless the
transmission is at operating
temperature. If you need to check
the transmission fluid level, please
take the vehicle to your dealer.
Engine Air Cleaner/Filter
See Engine Compartment Overview
0 269 for the location of the engine
air cleaner/filter.
When to Inspect the Engine Air
Cleaner/Filter
For intervals on changing and
inspecting the engine air cleaner/
filter, see Maintenance
Schedule 0344.
How to Inspect the Engine Air
Cleaner/Filter
Do not start the engine or have the
engine running with the engine air
cleaner/filter housing open. Before
removing the engine air cleaner/
filter, make sure that the engine air
cleaner/filter housing and nearby
components are free of dirt and
debris. Remove the engine air
cleaner/filter. Lightly tap and shake
the engine air cleaner/filter (away
from the vehicle), to release loose
dust and dirt. Inspect the engine air
cleaner/filter for damage, and
replace if damaged. Do not clean
the engine air cleaner/filter or
components with water or
compressed air.

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278 Vehicle Care
How to Add Coolant to the
Recovery Tank
{Warning
You can be burned if you spill
coolant on hot engine parts.
Coolant contains ethylene glycol
and it will burn if the engine parts
are hot enough. Do not spill
coolant on a hot engine.
Caution
This vehicle has a specific
coolant fill procedure. Failure to
follow this procedure could cause
the engine to overheat and be
severely damaged.
If recovery tank is empty, check the
coolant level in the radiator before
adding coolant to the recovery tank
or take the vehicle to the dealer for
service. See “How to Add Coolant to
the Radiator” later in this section. If coolant is needed, add the proper
DEX-COOL coolant mixture at the
coolant recovery tank.
How to Add Coolant to the
Radiator
{Warning
Steam and scalding liquids from a
hot cooling system can blow out
and burn you badly. Never turn
the cap when the cooling system,
including the surge tank pressure
cap, is hot. Wait for the cooling
system and surge tank pressure
cap to cool.
If coolant is needed, add the proper
mixture directly to the radiator, but
be sure the cooling system is cool
before this is done. Then check the
recovery tank and add coolant if
needed.
1. Detach the fasteners and lift off the panel that covers the
radiator cap.
2. Remove the radiator pressurecap when the cooling system,
including the upper radiator
hose, is no longer hot. Turn the
pressure cap slowly
counterclockwise about one
full turn.