2015 GMC Sierra Owners Manual

parked. If the warning is still displayed, turn off the engine until it cools down.

Overheated Engine Protection Operating Mode If an overheated engine condition exists and the ENGINE POWER IS REDUCED message displays, an overheat protection mode which alternates firing groups of cylinders helps to prevent engine damage. In this mode, a loss in power and engine performance will be noticed. This operating mode allows the vehicle to be driven to a safe place in an emergency. Driving extended distances and/or towing a trailer in the overheat protection mode should be avoided.

Vehicle Care

10-25

{ Caution

After driving in the overheated engine protection operating mode, the engine oil will be severely degraded. Any repairs performed before the engine is cool may cause engine damage. Allow the engine to cool before attempting any repair. Repair the cause of coolant loss, change the oil, and reset the oil life system. See Engine Oil on page 10-10.

Engine Fan If the vehicle has a clutched engine cooling fan, when the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slower and the clutch is not fully engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing, and/or high outside temperatures, the fan speed

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Vehicle Care

increases as the clutch more fully engages, so an increase in fan noise may be heard. This is normal and should not be mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fan will slow down when additional cooling is not required and the clutch disengages. This fan noise may also be heard when starting the engine. It will go away as the fan clutch partially disengages. If the vehicle has electric cooling fans, the fans may be heard spinning at low speed during most everyday driving. The fans may turn off if no cooling is required. Under heavy vehicle loading, trailer towing, high outside temperatures, or operation of the air conditioning system, the fans may change to high speed and an increase in fan noise may be heard. This is normal and indicates that the cooling system is functioning properly. The

fans will change to low speed when additional cooling is no longer required. The electric engine cooling fans may run after the engine has been turned. off. This is normal and no service is required.

Power Steering Fluid (1500 Series) The vehicle has electric power steering and does not use power steering fluid.

Power Steering Fluid (2500/3500 Series)

See Engine Compartment Overview on page 10-5 for reservoir location.

When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless there is a leak suspected in the system or an unusual noise is heard. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. Wait for the power steering system to cool, with the engine off, before checking the fluid. How to Check Power Steering Fluid To check the power steering fluid: 1. Turn the key off and let the

engine compartment cool down. 2. Wipe the cap and the top of the

reservoir clean.

3. Unscrew the cap and wipe the

dipstick with a clean rag.

4. Replace the cap and completely

tighten it.

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5. Remove the cap again and look at the fluid level on the dipstick.

The level should be between the ADD and FULL marks. If necessary, add only enough fluid to bring the level up to the hashed area between the ADD and FULL marks. What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11-12. Always use the proper fluid.

{ Caution

Use of the incorrect fluid may damage the vehicle and the damages may not be covered by the vehicle warranty. Always use the correct fluid listed in Recommended Fluids and Lubricants on page 11-12.

Washer Fluid

What to Use When windshield washer fluid needs to be added, be sure to read the manufacturer's instructions before use. Use a fluid that has sufficient protection against freezing in an area where the temperature may fall below freezing. Adding Washer Fluid The vehicle has a low washer fluid message on the DIC that comes on when the washer fluid is low. The message is displayed for 15 seconds at the start of each ignition cycle. When the WASHER FLUID LOW ADD FLUID message displays, washer fluid will need to be added to the windshield washer fluid reservoir.

Vehicle Care

10-27

Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview on page 10-5 for reservoir location.

{ Caution

. Do not use engine coolant

(antifreeze) in the windshield washer. It can damage the windshield washer system and paint.

. Do not mix water with

ready-to-use washer fluid. Water can cause the solution to freeze and damage the washer fluid tank and other parts of the washer system.

(Continued)

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Vehicle Care

Caution (Continued)

. When using concentrated

washer fluid, follow the manufacturer instructions for adding water.

. Fill the washer fluid tank only

three-quarters full when it is very cold. This allows for fluid expansion if freezing occurs, which could damage the tank if it is completely full.

Brakes This vehicle has front and rear disc brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound can come and go or be heard all the time the vehicle is moving, except when applying the brake pedal firmly.

{ Warning

The brake wear warning sound means that soon the brakes will not work well. That could lead to a crash. When the brake wear warning sound is heard, have the vehicle serviced.

{ Caution

Continuing to drive with worn-out brake pads could result in costly brake repair.

Some driving conditions or climates can cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with the brakes. Properly torqued wheel nuts are necessary to help prevent brake pulsation. When tires are rotated, inspect brake pads for wear and evenly tighten wheel nuts in the

proper sequence to torque specifications in Capacities and Specifications on page 12-2. Brake linings should always be replaced as complete axle sets. Brake Pedal Travel See your dealer if the brake pedal does not return to normal height, or if there is a rapid increase in pedal travel. This could be a sign that brake service might be required. Brake Adjustment Every time the brakes are applied, with or without the vehicle moving, the brakes adjust for wear. Replacing Brake System Parts The braking system on a vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. The vehicle was designed and tested with top-quality brake parts. When parts of the braking system are replaced, be sure to get

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new, approved replacement parts. If this is not done, the brakes might not work properly. For example, installing disc brake pads that are wrong for the vehicle, can change the balance between the front and rear brakes — for the worse. The braking performance expected can change in many other ways if the wrong replacement brake parts are installed.

Brake Fluid

The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview on page 10-5 for the location of the reservoir.

There are only two reasons why the brake fluid level in the reservoir might go down:

The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up.

. A fluid leak in the brake

hydraulic system can also cause a low fluid level. Have the brake hydraulic system fixed, since a leak means that sooner or later the brakes will not work well.

Do not top off the brake fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake hydraulic system.

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10-29

{ Warning

If too much brake fluid is added, it can spill on the engine and burn, if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. See “Checking Brake Fluid” in this section.

When the brake fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light on page 5-24. Refer to the Maintenance Schedule to determine when to check the brake fluid. See Maintenance Schedule on page 11-3. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview on page 10-5.

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Vehicle Care

Caution (Continued)

be replaced. Do not let someone put in the wrong kind of fluid.

. If brake fluid is spilled on the

vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on the vehicle. If you do, wash it off immediately.

Battery Refer to the replacement number shown on the original battery label when a new battery is needed. See Engine Compartment Overview on page 10-5 for battery location.

Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir.

{ Warning

With the wrong kind of fluid in the brake hydraulic system, the brakes might not work well. This could cause a crash. Always use the proper brake fluid.

{ Caution

. Using the wrong fluid can

badly damage brake hydraulic system parts. For example, just a few drops of mineral-based oil, such as engine oil, in the brake hydraulic system can damage brake hydraulic system parts so badly that they will have to (Continued)

The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak. After work is done on the brake hydraulic system, make sure the level is above MIN but not over the MAX mark.

What to Add Use only new DOT 3 brake fluid from a sealed container. See Recommended Fluids and Lubricants on page 11-12.

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{ Warning

Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.

Vehicle Storage

{ Warning

Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you are not careful. See Jump Starting on page 10-88 for tips on working around a battery without getting hurt.

Infrequent Usage: Remove the black, negative (−) cable from the battery to keep the battery from running down.

Extended Storage: Remove the black, negative (−) cable from the battery or use a battery trickle charger.

Four-Wheel Drive

Transfer Case

When to Check Lubricant Refer to Maintenance Schedule on page 11-3 to determine when to check the lubricant.

1. Fill Plug 2. Drain Plug

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10-31

To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the fill plug (1) hole, located on the transfer case, some lubricant will need to be added. Add enough lubricant to raise the level to the bottom of the fill plug (1) hole. Use care not to overtighten the plug.

When to Change Lubricant Refer to Maintenance Schedule on page 11-3 to determine how often to change the lubricant.

What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

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Vehicle Care

Front Axle

When to Check and Change Lubricant It is not necessary to regularly check front axle fluid unless a leak is suspected, or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired.

How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface.

1500 Series

All Except 1500 Series

1. Fill Plug 2. Drain Plug

1. Fill Plug 2. Drain Plug . When the differential is cold, add

enough lubricant to raise the level from 0 mm (0 in) to 3.2 mm (1/8 in) below the fill plug (1) hole.

. When the differential is at

operating temperature (warm), add enough lubricant to raise the level to the bottom of the fill plug (1) hole.

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What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

Rear Axle

When to Check Lubricant It is not necessary to regularly check rear axle fluid unless a leak is suspected or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired. All axle assemblies are filled by volume of fluid during production. They are not filled to reach a certain level. When checking the fluid level on any axle, variations in the readings can be caused by factory fill differences between the minimum and the maximum fluid volume. Also, if a vehicle has just been driven before checking the fluid level, it may appear lower than normal because fluid has traveled

out along the axle tubes and has not drained back to the sump area. Therefore, a reading taken five minutes after the vehicle has been driven will appear to have a lower fluid level than a vehicle that has been stationary for an hour or two. The rear axle assembly must be supported on a flat, level surface to get a true reading. How to Check Lubricant

2500HD with 6.0L

All Other Series and Engines

To get an accurate reading, the vehicle should be on a level surface.

For all 4.3L and 5.3L 1500
Series applications, the proper level is 1.0 mm to 19.0 mm (0.04 in to 0.7 in) below the bottom of the fill hole, located on the rear axle. Add only enough fluid to reach the proper level. For 6.2L 1500 Series applications, the proper level is from 15 mm to 40 mm (0.6 in to 1.6 in) below the bottom of the

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Vehicle Care

fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level. For all 6.0L 2500HD Series applications, the proper level is from 0 mm to 13 mm (0 to 0.5 in) below the bottom of the fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level. For all 6.6L Duramax Diesel 2500HD Series applications and all 3500 Series applications, the proper level is from 17 mm to 21 mm (0.6 in to 0.8 in) below the bottom of the fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level.

What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lb). The noise control system warranty is given in your warranty manual. These standards apply only to vehicles sold in the United States. Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering

inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or

2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below.

Insulation: Removal of the noise shields or any underhood insulation.

Engine: Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications.

Fan and Drive: . Removal of fan clutch, if the

vehicle has one, or rendering clutch inoperative.

. Removal of the fan shroud, if the

vehicle has one.

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Air Intake: . Removal of the air cleaner

silencer.

. Modification of the air cleaner.

Exhaust: . Removal of the muffler and/or

resonator.

. Removal of the exhaust pipes

and exhaust pipe clamps.

Starter Switch Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

1. Before starting this check, be

sure there is enough room around the vehicle.

2. Apply both the parking brake

1. Before starting this check, be

Vehicle Care

10-35

and the regular brake. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts.

3. Try to start the engine in each gear. The vehicle should start only in P (Park) or N (Neutral). If the vehicle starts in any other position, contact your dealer for service.

Automatic Transmission Shift Lock Control Function Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

sure there is enough room around the vehicle. It should be parked on a level surface.

2. Apply the parking brake. Be

ready to apply the regular brake immediately if the vehicle begins to move.

3. With the engine off, turn the

ignition on, but do not start the engine. Without applying the regular brake, try to move the shift lever out of P (Park) with normal effort. If the shift lever moves out of P (Park), contact your dealer for service.

Ignition Transmission Lock Check While parked and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.

The ignition should turn to LOCK/OFF only when the shift lever is in P (Park).

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Vehicle Care

The ignition key should come out only in LOCK/OFF.

Contact your dealer if service is required.

Park Brake and P (Park) Mechanism Check { Warning

When you are doing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case it begins to roll. Be ready to apply the regular brake at once should the vehicle begin to move.

Park on a fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, set the parking brake.

To check the parking brake's holding ability: With the engine running and the transmission in N (Neutral), slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake only. To check the P (Park) mechanism's holding ability: With the engine running, shift to P (Park). Then release the parking brake followed by the regular brake.

Contact your dealer if service is required.

Wiper Blade Replacement Windshield wiper blades should be inspected for wear or cracking. See Maintenance Schedule on page 11-3.

Replacement blades come in different types and are removed in different ways. For proper windshield wiper blade length and type, see Maintenance Replacement Parts on page 11-14.

{ Caution

Allowing the wiper arm to touch the windshield when no wiper blade is installed could damage the windshield. Any damage that occurs would not be covered by your warranty. Do not allow the wiper arm to touch the windshield.

To replace the windshield wiper blade: 1. Pull the windshield wiper assembly away from the windshield.

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Headlamp Aiming Headlamp aim has been preset and should need no further adjustment. If the vehicle is damaged in a crash, the headlamp aim may be affected. If adjustment to the headlamps is necessary, see your dealer.

Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 10-40. For any bulb‐changing procedure not listed in this section, contact your dealer.

Halogen Bulbs

{ Warning

Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package.

LED Lighting This vehicle has several LED lamps. For replacement of any LED lighting assembly, contact your dealer.

2. Press the button (2) in the

middle of the wiper arm connector, and pull the wiper blade away from the arm connector (1).

3. Remove the wiper blade. 4. Reverse Steps 1–3 for wiper

blade replacement.

Glass Replacement If the windshield or front side glass must be replaced, see your dealer to determine the correct replacement glass.

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Fog Lamps To replace the front fog lamp bulb: 1. Locate the fog lamp under the

front bumper.

2. Disconnect the electrical

connector from the fog lamp bulb assembly by pressing the connector release.

3. Remove the bulb from the

housing by squeezing the two release tabs and pulling it straight out of the assembly.

10-38

Vehicle Care

Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps

Driver Side 1. Front Turn Signal/Sidemarker/

Parking Lamp

2. High/Low-Beam Headlamp See your dealer for passenger side replacement. Headlamp 1. Open the hood.

2. Remove the headlamp bulb assembly cover by turning it counterclockwise.

3. Turn the bulb socket

counterclockwise to remove it from the headlamp assembly and pull it straight out.

4. Unplug the electrical connector

from the old bulb by releasing the clip on the bulb socket.

Turn Signal/Sidemarker/ Parking Lamp 1. Open the hood. 2.

If replacing a bulb on the passenger side, remove the engine air cleaner.

3. Turn the bulb socket

counterclockwise to remove it from the headlamp assembly and pull it straight out.

4. Remove the bulb by pulling it straight out of the bulb socket.

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Taillamps (Chassis Cab Models)

Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps

1. Back-Up Lamp 2. Stoplamp/Taillamp/Turn

Signal Lamp

To replace one of these bulbs: 1. Remove the four screws. 2. Lift the lens off the lamp

assembly.

3. Turn the old bulb

counterclockwise and pull it straight out from the socket.

Single Rear Wheel Lamp Shown, Dual Rear Wheel Lamp Similar

1. Stoplamp/Taillamp/Turn

Signal Lamp

2. Back-Up Lamp 3. Sidemarker Lamp To replace one of these bulbs: 1. Open the tailgate.

2. Remove the two rear lamp assembly screws and pull rearward until disengaging the two outer pins on the taillamp assembly from the vehicle.

3. Turn the bulb socket

counterclockwise to remove it from the taillamp assembly.

4. Pull the bulb straight out from

the socket.

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Vehicle Care

Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp

To replace one of these bulbs:

2. Turn the bulb socket

counterclockwise and pull it straight out.

3. Pull the bulb straight out of the

socket.

Replacement Bulbs

Exterior Lamp

Back-Up Lamp Back-Up Lamp* Cargo Lamp Center High-Mounted Stoplamp (CHMSL) Fog Lamp Front Turn Signal Lamp and Parking Lamp High/Low-Beam Headlamp

Bulb

Number

921 (W16W)

1156

921 (W16W)

921LL

PS24W 7443 LL

HIR–2

(9012 LL)

1. Cargo Lamp Bulbs 2. Center High-Mounted Stoplamp

(CHMSL) Bulb

1. Remove the two screws and lift

off the lamp assembly.

2. Turn the bulb socket

counterclockwise and pull it straight out.

3. Pull the bulb straight out from

the socket.

License Plate Lamp To replace one of these bulbs: 1. Locate the license plate lamp

under the rear bumper.

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Bulb

Number W5W LL

194

7444 LL

1157

Exterior Lamp

License Plate Lamp Rear Sidemarker Lamp Stoplamp/Taillamp/ Turn Signal Lamp Stoplamp/Turn Signal Lamp/ Taillamp* * Chassis Cab Models

For replacement bulbs not listed here, contact your dealer.

Electrical System

Electrical System Overload The vehicle has fuses to protect against an electrical system overload. Fuses also protect power devices in the vehicle. Replace a bad fuse with a new one of the identical size and rating. If there is a problem on the road and a fuse needs to be replaced, there are some spare fuses and a fuse puller in the Instrument Panel Fuse Block. The same amperage fuse can also be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible. Headlamp Wiring An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the

Vehicle Care

10-41

headlamp wiring checked right away if the lamps go on and off or remain off. Windshield Wipers If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers. If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.

Fuses The wiring circuits in the vehicle are protected from short circuits by fuses. This greatly reduces the chance of fires caused by electrical problems.

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Vehicle Care

Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating. Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as you can.

Engine Compartment Fuse Block If the vehicle has a diesel engine, see the Duramax diesel supplement. The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.

{ Caution

Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

A fuse puller is available in the left instrument panel fuse block. The vehicle may not be equipped with all of the fuses, relays, and features shown.

Lift the cover to access the fuse block.

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Micro J-Case Fuses

J-Case Fuses

10

11
12

Usage

Trailer Brake Trailer Battery

Usage

Antilock Brake System Pump Instrument Panel BEC 1
Spare 4WD Trec Spare Instrument Panel BEC 2
Spare Rear Window Defogger Starter Cooling Fan 1

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Vehicle Care

J-Case Fuses

Usage

13

Cooling Fan 2

Mini Fuses

(2 Pin)

Usage

14

15

16

17

Trailer Stop/Turn Lamps, Left Trailer Parking Lamps Trailer Back-up Lamp Trailer Stop/Turn Lamps, Right

Micro Fuses

(2 Pin)

Usage

18
19

20

Fuel Pump Integrated Chassis Control Module Electronic Suspension Control Module

Micro Fuses

(2 Pin)

Usage

Micro Fuses

(2 Pin)

Usage

21

22
23
24
25

26
27
28

29

30
31
32
33
34

Fuel Pump Power Module Upfitter Switch 1
Upfitter 2
Front Wiper Antilock Brake System Valves Upfitter SW 2
Upfitter SW 3
Parking Lamps, Right Parking Lamps, Left Upfitter 3
Upfitter SW 4
Upfitter 4
Back-up Lamps Engine Control Module Ignition

35

36
37
38

39

40

41
42
43
44

45

46
47

Air Conditioning Compressor Clutch Heated Mirrors Upfitter 1
Center High-Mounted Stoplamp Miscellaneous Ignition Transmission Ignition Fuel Pump 2
Cooling Fan Clutch Engine Fuel Injectors A, Odd Fuel Injectors B, Even Oxygen Sensor B Throttle Control

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Micro Relays

67
68

69

Mini Relays

70

71

Usage

Fuel Pump 2
Air Conditioning Control Starter

Usage Rear Window Defogger Engine Control Module

Solid State

Relay

Usage

72

Cooling Fan Clutch

Micro Fuses

(2 Pin)

Usage

Micro Fuses

(3 Pin)

Usage

48
49
50
51

52
53
54
55

Micro Fuses

(3 Pin)

56

Horn Fog Lamp Oxygen Sensor A Engine Control Module Interior Heater Spare Aeroshutter Front Washer

Usage

Air Conditioning Compressor/ Battery Regulated Voltage Control

57

58

59

Air Conditioning Compressor Module/ Battery Pack Transmission Control Module/ Engine Control Module Headlamps

Micro Relays

Usage

60
61
62
63
64

65
66

Fuel Pump Upfitter 2
Upfitter 3
Upfitter 4
Trailer Parking Lamps Run/Crank Upfitter 1

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Vehicle Care

Instrument Panel Fuse Block (Left)

The left instrument panel fuse block access door is on the driver side edge of the instrument panel. Pull off the cover to access the fuse block.

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The vehicle may not be equipped with all of the fuses, relays, and features shown.

Number

Usage

10

11

Accessory Power Outlet 2
SEO Retained Accessory Power Universal Garage Door Opener/Inside Rearview Mirror Body Control Module 3
Body Control Module 5
Driver Window Switch/Mirror Switch Spare Accessory Power Outlet Retained Accessory Power Accessory Power Outlet Battery

Vehicle Care

10-47

Number

Usage

Number

12

13

14
17

19
20
22

23

24
25

Accessory Power Outlet 1/Cigarette Lighter Discrete Logic Ignition Switch Switch Backlighting Body Control Module 1
Spare Spare Heater, Ventilation, and Air Conditioning/ Auxiliary Heater, Ventilation and Air Conditioning Ignition Instrument Cluster Ignition/Sensing Diagnostic Module Ignition Spare Data Link Connector/ Driver Seat Module

26

27
28
29

30
31
32

33
34
36
37
40
41

Usage Passive Entry Passive Start/Heater, Ventilation, and Air Conditioning Spare Spare Park Enable/ Electrically Adjustable Pedals SEO Accessory/Run Crank Heated Steering Wheel Spare Instrument Cluster Spare Spare Left Doors Driver Power Seat

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Instrument Panel Fuse Block (Right)

10-48

Vehicle Care

Number

Usage

43

44

45
49

50

Left Front Heated/ Cooled Seat Right Front Heated/ Cooled Seats Spare Retained Accessory Power/Accessory Run/Crank

The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Pull off the cover to access the fuse block.

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Vehicle Care

10-49

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Number

Usage

10
15

18
19
20
23

Accessory Power Outlet 3
Accessory Power Outlet 4
Body Control Module 4
Body Control Module 8
Rear Seat Entertainment Cargo Lamp Steering Wheel Controls Radio Spare Sunroof Airbag/Info

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10-50

Vehicle Care

Number

Usage

Number

Usage

26

27

28

32
35
36
37
39
42

43

Export/Power Take Off/SEO Battery 1
Obstacle Detection/ USB Ports Body Control Module 2
SEO Battery 2
AC Inverter Amplifier Spare Rear Sliding Window Right Door Window Motor Front Blower

44
45

46

47
50

51

52

SEO Body Control Module 6
Body Control Module 7
Passenger Seat Retained Accessory Power/Accessory Rear Sliding Window Open Rear Sliding Window Close

Wheels and Tires

Tires Every new GM vehicle has high-quality tires made by a leading tire manufacturer. See the warranty manual for information regarding the tire warranty and where to get service. For additional information refer to the tire manufacturer.

{ Warning

. Poorly maintained and

improperly used tires are dangerous.

. Overloading the tires can

cause overheating as a result of too much flexing. There could be a blowout

(Continued)

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Warning (Continued)

Warning (Continued)

and a serious crash. See Vehicle Load Limits on page 9-15.

. Underinflated tires pose

the same danger as overloaded tires. The resulting crash could cause serious injury. Check all tires frequently to maintain the recommended pressure. Tire pressure should be checked when the tires are cold.

. Overinflated tires are more likely to be cut, punctured, or broken by a sudden impact — such as when hitting a pothole. Keep tires at the recommended pressure.

(Continued)

. Worn or old tires can

cause a crash. If the tread is badly worn, replace them.

. Replace any tires that

have been damaged by impacts with potholes, curbs, etc.

. Improperly repaired tires can cause a crash. Only the dealer or an authorized tire service center should repair, replace, dismount, and mount the tires.

. Do not spin the tires in

excess of 56 km/h (35 mph) on slippery surfaces such as snow, mud, ice, etc. Excessive spinning may cause the tires to explode.

Vehicle Care

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All-Season Tires This vehicle may come with all-season tires. These tires are designed to provide good overall performance on most road surfaces and weather conditions. Original equipment tires designed to GM's specific tire performance criteria have a TPC specification code molded onto the sidewall. Original equipment all-season tires can be identified by the last two characters of this TPC code, which will be “MS.” Consider installing winter tires on the vehicle if frequent driving on snow or ice-covered roads is expected. All-season tires provide adequate performance for most winter driving conditions, but they may not offer the same level of traction or performance as winter tires on snow or ice-covered roads. See Winter Tires on page 10-52.

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Vehicle Care

Winter Tires This vehicle was not originally equipped with winter tires. Winter tires are designed for increased traction on snow and ice-covered roads. Consider installing winter tires on the vehicle if frequent driving on ice or snow covered roads is expected. See your dealer for details regarding winter tire availability and proper tire selection. Also, see Buying New Tires on page 10-69. With winter tires, there may be decreased dry road traction, increased road noise, and shorter tread life. After changing to winter tires, be alert for changes in vehicle handling and braking. If using winter tires: . Use tires of the same brand and

tread type on all four wheel positions.

. Use only radial ply tires of the

same size, load range, and speed rating as the original equipment tires.

Winter tires with the same speed rating as the original equipment tires may not be available for H, V, W, Y, and ZR speed rated tires. If winter tires with a lower speed rating are chosen, never exceed the tire's maximum speed capability.

Low-Profile Tires If the vehicle has P275/55R20, P285/50R20, or P285/45R22
size tires, they are classified as low-profile tires.

{ Caution Low-profile tires are more susceptible to damage from road hazards or curb impact than standard profile tires. Tire and/or wheel assembly damage can

(Continued)

Caution (Continued)

occur when coming into contact with road hazards like potholes, or sharp edged objects, or when sliding into a curb. The warranty does not cover this type of damage. Keep tires set to the correct inflation pressure and when possible, avoid contact with curbs, potholes, and other road hazards.

All-Terrain Tires This vehicle may have all-terrain tires. These tires provide good performance on most road surfaces, weather conditions, and for off-road driving. See Off-Road Driving on page 9-6. The tread pattern on these tires may wear more quickly than other tires. Consider rotating the tires more frequently than at 12 000 km (7,500 mi) intervals if irregular wear

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is noted when the tires are inspected. See Tire Inspection on page 10-66.

Tire Sidewall Labeling Useful information about a tire is molded into the sidewall. The examples show a typical passenger and light truck tire sidewall.

Passenger (P-Metric)/Spare Tire (1) Tire Size: The tire size code is a combination of letters and numbers used to define a

particular tire's width, height, aspect ratio, construction type, and service description. See the “Tire Size” illustration later in this section for more detail. (2) TPC Spec (Tire Performance Criteria Specification): Original equipment tires designed to GM's specific tire performance criteria have a TPC specification code molded onto the sidewall. GM's TPC specifications meet or exceed all federal safety guidelines. (3) DOT (Department of Transportation): The Department of Transportation (DOT) code indicates that the tire is in compliance with the U.S. Department of Transportation Motor Vehicle Safety Standards.

Vehicle Care

10-53

DOT Tire Date of Manufacture: The last four digits of the TIN indicate the tire manufactured date. The first two digits represent the week (01-52) and the last two digits, the year. For example, the third week of the year 2010 would have a four-digit DOT date of 0310. (4) Tire Identification Number (TIN): The letters and numbers following the DOT code are the Tire Identification Number (TIN). The TIN shows the manufacturer and plant code, tire size, and date the tire was manufactured. The TIN is molded onto both sides of the tire, although only one side may have the date of manufacture. (5) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread.

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Vehicle Care

(6) Uniform Tire Quality Grading (UTQG): Tire manufacturers are required to grade tires based on three performance factors: treadwear, traction, and temperature resistance. For more information, see Uniform Tire Quality Grading on page 10-72. (7) Maximum Cold Inflation Load Limit: Maximum load that can be carried and the maximum pressure needed to support that load. For information on recommended tire pressure see Tire Pressure on page 10-59 and Vehicle Load Limits on page 9-15. (8) Temporary Use Only: Only use a temporary spare tire until the road tire is repaired and replaced. This spare tire should not be driven on over 112 km/h (70 mph), or 88 km/h (55 mph) when pulling a trailer, with the

proper inflation pressure. See Full-Size Spare Tire on page 10-87.

Light Truck (LT-Metric) Tire

(1) Tire Size: The tire size code is a combination of letters and numbers used to define a particular tire's width, height, aspect ratio, construction type, and service description. See the “Tire Size” illustration later in this section for more detail.

(2) TPC Spec (Tire Performance Criteria Specification): Original equipment tires designed to GM's specific tire performance criteria have a TPC specification code molded onto the sidewall. GM's TPC specifications meet or exceed all federal safety guidelines. (3) Dual Tire Maximum Load: Maximum load that can be carried and the maximum pressure needed to support that load when used in a dual configuration. For information on recommended tire pressure see Tire Pressure on page 10-59
and Vehicle Load Limits on page 9-15. (4) DOT (Department of Transportation): The Department of Transportation (DOT) code indicates that the tire is in compliance with the

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(6) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread. (7) Single Tire Maximum Load: Maximum load that can be carried and the maximum pressure needed to support that load when used as a single. For information on recommended tire pressure see Tire Pressure on page 10-59 and Vehicle Load Limits on page 9-15.

Tire Designations

Tire Size The examples show a typical passenger vehicle and light truck tire size.

U.S. Department of Transportation Motor Vehicle Safety Standards. DOT Tire Date of Manufacture: The last four digits of the TIN indicate the tire manufactured date. The first two digits represent the week (01-52) and the last two digits, the year. For example, the third week of the year 2010 would have a four-digit DOT date of 0310. (5) Tire Identification Number (TIN): The letters and numbers following the DOT code are the Tire Identification Number (TIN). The TIN shows the manufacturer and plant code, tire size, and date the tire was manufactured. The TIN is molded onto both sides of the tire, although only one side may have the date of manufacture.

Vehicle Care

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Passenger (P-Metric) Tire

(1) Passenger (P-Metric) Tire : The United States version of a metric tire sizing system. The letter P as the first character in the tire size means a passenger vehicle tire engineered to standards set by the U.S. Tire and Rim Association. (2) Tire Width : The three-digit number indicates the tire section width in millimeters from sidewall to sidewall. (3) Aspect Ratio : A two-digit number that indicates the tire