
4. Reapply the brake pedal. Then apply the parkingbrake and shift into P (Park).
5. Release the brake pedal.
{WARNING:
It can be dangerous to get out of the vehicle if the
shift lever is not fully in P (Park) with the parking
brake firmly set. The vehicle can roll.
If the engine has been left running, the vehicle
can move suddenly. You or others could be
injured. To be sure the vehicle will not move, even
when on fairly level ground, always put the shift
lever fully in P (Park) with the parking brake
firmly set.
Leaving After Parking on a Hill
1. Apply and hold the brake pedal.
2. Start the engine
3. Shift into a gear
4. Release the parking brake
5. Let up on the brake pedal.
6. Drive slowly until the trailer is clear of the chocks.
7. Stop and have someone pick up and storethe chocks.
Maintenance When Trailer Towing
The vehicle needs service more often when pulling atrailer. See this manual's Maintenance Schedule orIndex for more information. Things that are especiallyimportant in trailer operation are automatic transmissionfluid, engine oil, axle lubricant, belts, cooling systemand brake system. It is a good idea to inspect thesebefore and during the trip.
Check periodically to see that all hitch nuts and boltsare tight.
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Trailer Wiring Harness
Heavy-Duty Trailer Wiring Harness Package
The vehicle has a seven-pin universal heavy-duty trailerconnector attached to the rear bumper beam next to theintegrated trailer hitch.
The seven-wire harness contains the followingtrailer circuits:
.Yellow: Left Stop/Turn Signal
.Dark Green: Right Stop/Turn Signal
.Brown: Taillamps
.White: Ground
.Light Green: Back-up Lamps
.Red: Battery Feed*
.Dark Blue: Trailer Brake*
*The fuses for these two circuits are installed in theunderhood electrical center, but the wires are notconnected. They should be connected by yourdealer/retailer or a qualified service center.
If charging a remote (non-vehicle) battery, press thetow/haul mode button located at the end of the shiftlever. This will boost the vehicle system voltage andproperly charge the battery. If the trailer is too light fortow/haul mode, turn on the headlamps as a second wayto boost the vehicle system and charge the battery.
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Electric Brake Control Wiring
Provisions
These wiring provisions are included with the vehicle aspart of the trailer wiring package. These provisions arefor an electric brake controller. The instrument panelcontains blunt cut wires near the data link connector forthe trailer brake controller. The harness contains thefollowing wires:
.Dark Blue: Brake Signal to Trailer Connector
.Red/Black: Battery
.Light Blue/White: Brake Switch
.White: Ground
It should be installed by your dealer/retailer or aqualified service center.
Trailer Recommendations
Subtract the hitch loads from the Cargo Weight Rating(CWR). CWR is the maximum weight of the load thevehicle can carry. It does not include the weight of thepeople inside, but you can figure about 150 lbs. (68 kg)for each passenger. The total cargo load must not bemore than the vehicles CWR.
Weigh the vehicle with the trailer attached, so theGVWR or GAWR are not exceeded. If using aweight-distributing hitch, weigh the vehicle without thespring bars in place.
The best performance is obtained by correctlyspreading out the weight of the load and choosing thecorrect hitch and trailer brakes.
For more information seeTowing a Traileronpage 6!42.
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Section 7 Service and Appearance Care
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4Accessories and Modifications . . . . . . . . . . . . . . . . . . 7-4California Proposition 65 Warning . . . . . . . . . . . . . . . 7-5California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5Doing Your Own Service Work . . . . . . . . . . . . . . . . . . 7-6Adding Equipment to the Outside of theVehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7Gasoline Octane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8Gasoline Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 7-8California Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9Fuel E85 (85% Ethanol) . . . . . . . . . . . . . . . . . . . . . . . . . 7-9Fuels in Foreign Countries . . . . . . . . . . . . . . . . . . . . . 7-10Filling the Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11Filling a Portable Fuel Container . . . . . . . . . . . . . . . 7-13
Checking Things Under the Hood. . . . . . . . . . . . . . . 7-14Hood Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15Engine Compartment Overview . . . . . . . . . . . . . . . . 7-16Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17Engine Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 7-20Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . . 7-22
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . 7-24Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28Engine Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29Engine Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-34Overheated Engine ProtectionOperating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37Engine Fan Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-37Power Steering Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 7-38Windshield Washer Fluid . . . . . . . . . . . . . . . . . . . . . . 7-39Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-40Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43Jump Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44
All-Wheel Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-49
Rear Axle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-50
Front Axle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-51
Headlamp Aiming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-52
Bulb Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-54High Intensity Discharge (HID) Lighting . . . . . . . . 7-54LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55Back-Up Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55License Plate Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56Replacement Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56
7-1

Section 7 Service and Appearance Care
Windshield Wiper Blade Replacement. . . . . . . . . . . 7-57
Tires. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-58Tire Sidewall Labeling . . . . . . . . . . . . . . . . . . . . . . . . . 7-60Tire Terminology and Definitions . . . . . . . . . . . . . . . 7-62Inflation - Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . 7-65High-Speed Operation . . . . . . . . . . . . . . . . . . . . . . . . . 7-66Tire Pressure Monitor System . . . . . . . . . . . . . . . . . 7-67Tire Pressure Monitor Operation . . . . . . . . . . . . . . . 7-68Tire Inspection and Rotation . . . . . . . . . . . . . . . . . . . 7-71When It Is Time for New Tires . . . . . . . . . . . . . . . . . 7-73Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-73Different Size Tires and Wheels . . . . . . . . . . . . . . . 7-75Uniform Tire Quality Grading . . . . . . . . . . . . . . . . . . . 7-76Wheel Alignment and Tire Balance . . . . . . . . . . . . 7-77Wheel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-77Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-78If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-79Changing a Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-80Removing the Spare Tire and Tools . . . . . . . . . . . . 7-81Removing the Flat Tire and Installing theSpare Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-86Secondary Latch System . . . . . . . . . . . . . . . . . . . . . . 7-91Storing a Flat or Spare Tire and Tools . . . . . . . . . 7-94Spare Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-98
Appearance Care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-98Interior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-98Fabric/Carpet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-99Leather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-100Instrument Panel, Vinyl, and Other PlasticSurfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-101Wood Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-101Speaker Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-101Care of Safety Belts . . . . . . . . . . . . . . . . . . . . . . . . . . 7-102Weatherstrips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-102Washing Your Vehicle . . . . . . . . . . . . . . . . . . . . . . . . 7-102Cleaning Exterior Lamps/Lenses . . . . . . . . . . . . . 7-103Finish Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-103Windshield, Backglass, and Wiper Blades . . . . 7-104Aluminum or Chrome-Plated Wheelsand Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-104Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-105Sheet Metal Damage . . . . . . . . . . . . . . . . . . . . . . . . . 7-105Finish Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-106Underbody Maintenance . . . . . . . . . . . . . . . . . . . . . 7-106Chemical Paint Spotting . . . . . . . . . . . . . . . . . . . . . . 7-106
Vehicle Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-107Vehicle Identification Number (VIN) . . . . . . . . . . . 7-107Service Parts Identification Label . . . . . . . . . . . . . 7-107
7-2

Section 7 Service and Appearance Care
Electrical System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-108Add-On Electrical Equipment . . . . . . . . . . . . . . . . . 7-108Windshield Wiper Fuses . . . . . . . . . . . . . . . . . . . . . . 7-108Power Windows and Other Power Options . . . 7-108Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . 7-108
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . 7-109Center Instrument Panel Fuse Block . . . . . . . . . . 7-110Underhood Fuse Block . . . . . . . . . . . . . . . . . . . . . . . 7-111
Capacities and Specifications. . . . . . . . . . . . . . . . . . 7-115
7-3

Service
For service and parts needs, visit your dealer/retailer.You will receive genuine GM parts and GM-trained andsupported service people.
Genuine GM parts have one of these marks:
Accessories and Modifications
When non!dealer/non!retailer accessories are added tothe vehicle, they can affect vehicle performance andsafety, including such things as airbags, braking,stability, ride and handling, emissions systems,aerodynamics, durability, and electronic systems likeantilock brakes, traction control, and stability control.Some of these accessories could even causemalfunction or damage not covered by the vehiclewarranty.
Damage to vehicle components resulting from theinstallation or use of non!GM certified parts, includingcontrol module modifications, is not covered under theterms of the vehicle warranty and may affect remainingwarranty coverage for affected parts.
7-4

GM Accessories are designed to complementand function with other systems on the vehicle.Your GM dealer/retailer can accessorize the vehicleusing genuine GM Accessories. When you go toyour GM dealer/retailer and ask for GM Accessories,you will know that GM-trained and supported servicetechnicians will perform the work using genuineGM Accessories.
Also, seeAdding Equipment to Your Airbag-EquippedVehicle on page 2!89.
California Proposition 65 Warning
Most motor vehicles, including this one, contain and/oremit chemicals known to the State of California tocause cancer and birth defects or other reproductiveharm. Engine exhaust, many parts and systems, manyfluids, and some component wear by-products containand/or emit these chemicals.
California Perchlorate Materials
Requirements
Certain types of automotive applications, such as airbaginitiators, seat belt pretensioners, and lithium batteriescontained in remote keyless transmitters, may containperchlorate materials. Special handling may benecessary. For additional information, seewww.dtsc.ca.gov/hazardouswaste/perchlorate.
7-5