2015 Chevrolet Express Owners Manual

DEX-COOL coolant mixture through the filler neck until the level reaches the base of the filler neck.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

Black plate (19,1)

{ Caution

Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.

If Steam is Coming from the Engine Compartment { Warning

Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood.

(Continued)

Warning (Continued)

If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.

If No Steam is Coming from the Engine Compartment If an engine overheat warning is displayed but no steam can be seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: . Climbs a long hill on a hot day. . Stops after high-speed driving. Idles for long periods in traffic. Tows a trailer. See “Driving on Grades” under Trailer Towing on page 9-47.

Vehicle Care

10-19

If the overheat warning is displayed with no sign of steam: 1. Turn the air off. 2. Turn the heater on to the highest

temperature and to the highest fan speed. Open the windows as necessary.

3. When it is safe to do so, pull off

the road, shift to P (Park) or N (Neutral) and let the engine idle.

If the engine coolant temperature gauge is no longer in the overheat zone or an overheat warning no longer displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for proper fit and function. If the warning continues, pull over, stop, and park the vehicle right away.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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10-20

Vehicle Care

If there is still no sign of steam, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least three minutes while parked. If the warning is still on, turn off the engine until it cools down. If the decision is made not to lift the hood, get service help right away.

Engine Fan 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 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 partially disengages. This fan noise may be heard when starting the engine. It will go away as the fan clutch partially disengages.

Power Steering Fluid

The power steering fluid reservoir is in the engine compartment on the driver side of the vehicle. 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. 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.

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

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The level should be at the COLD FILL mark. If necessary, add only enough fluid to bring the level up to the mark. To prevent contamination of brake fluid, never check or fill the power steering reservoir with the brake master cylinder cover off. What to Use

{ 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 11-11.

To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11-11. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals.

Washer Fluid

What to Use When the vehicle needs windshield washer fluid, be sure to read the manufacturer's instructions before use. If operating the vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Adding Washer Fluid

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.

Vehicle Care

10-21

{ 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.

. 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.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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10-22

Vehicle Care

Brakes This vehicle has 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 when 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. See Capacities and Specifications on page 12-2. Brake pads should be replaced as complete 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 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.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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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.

Vehicle Care

10-23

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.

{ Warning

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.

If too much brake fluid is added, it can spill on the engine and/or fuel operated heater parts, if equipped. If the vehicle has a diesel engine and a fuel operated heater, see “Fuel Operated Heater (FOH)” in the diesel engine supplement. The fluid will 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.

The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak.

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10-24

Vehicle Care

After work is done on the brake hydraulic system, make sure the level is above the 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 11-11. 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.

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.

{ 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.

{ 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 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.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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Vehicle Storage

How to Check Lubricant

{ 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 10-74 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.

Rear Axle

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

To get an accurate reading, the vehicle should be on a level surface. The proper level for the 2500 and 3500 Series is from 0 to 6 mm (1/4 in) below the bottom of the fill plug hole. Add only enough fluid to reach the proper level.

Vehicle Care

10-25

What to Use Refer to Recommended Fluids and Lubricants on page 11-11 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 lbs). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the life of the vehicle. The noise control system warranty is given in the vehicle warranty booklet. These standards apply only to vehicles sold in the United States.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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10-26

Vehicle Care

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.

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.

Fuel Operated Heater (FOH) — Diesel Engine: . Removal of the muffler.

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

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).

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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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.

1. Before starting this check, be

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

Contact your dealer if service is required.

Vehicle Care

10-27

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.

Chevrolet Express Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 7707481) - 2015 - CRC - 4/30/14

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10-28

Vehicle Care

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 and cracking. See Maintenance Schedule on page 11-3. Replacement blades come in different types and are removed in different ways. For proper type and length, see Maintenance Replacement Parts on page 11-13.

{ Caution

Allowing the wiper arm to touch the windshield when no wiper blade is installed could damage

(Continued)

Caution (Continued)

the windshield. Any damage that occurs would not be covered by your warranty. Do not allow the wiper arm to touch the windshield.

1. Lift the wiper arm away from the

windshield.

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.

2. Push the release lever (2) to

disengage the hook and push the wiper arm (1) out of the blade assembly (3).

3. Push the new blade assembly securely on the wiper arm until the release lever clicks into place.

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Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 10-33. 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.

Vehicle Care

10-29

Headlamps

Composite Headlamp

1. High-Beam Headlamp 2. Low-Beam Headlamp

To remove the headlamp assembly from the vehicle and access the bulbs: 1. Open the hood. See Hood on

page 10-4.

2. Remove the two bolts from the

headlamp assembly.

3. Lift the headlamp assembly to release the lower tabs from the radiator support.

4. Turn the headlamp forward and

upward to remove it from the grille.

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10-30

Vehicle Care

8. Reverse the steps to reinstall the

headlamp assembly. To prevent headlamp vibration and shortened bulb life, be sure to insert the headlamp assembly tabs in the slots at the lower portion of the housing.

Sealed-Beam Headlamp

To replace one of these bulbs: 1. Remove the four screws (1) from

the headlamp retainer (2). Pull the retainer (2) out and set it aside.

2. Pull the bulb (3) forward to gain

access to the electrical connector.

5. Disconnect the electrical

connector.

6. Turn the bulb counterclockwise

7.

one-quarter turn to remove it from the headlamp assembly. Install the new bulb into the headlamp assembly and connect the electrical connector.

1. Headlamp retainer screws 2. Headlamp retainer 3. Sealed-beam headlamp bulb

3. Disconnect the electrical

connector (2) and remove the headlamp bulb (1).

4. Reverse Steps 1–3 to reinstall

the headlamp.

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Front Turn Signal, Sidemarker, and Parking Lamps

1. Front Parking and Turn

Signal Lamp

2. Front Sidemarker Lamp To replace the front turn signal, sidemarker, and/or parking lamp bulb(s):

1. Use a small tool to unlatch the

outboard clip on the lamp by pushing inboard and prying the lamp assembly forward.

2. Remove the lamp from the grille. 3. Turn the bulb socket

counterclockwise one-quarter turn and remove it from the lamp assembly.

4. Remove the bulb from the

socket by pulling it straight out.

5. Replace the bulb. 6. Turn the bulb socket clockwise

to reinstall it in the lamp assembly.

7. Reinstall the lamp assembly into

the grille until the outboard clip snaps into place.

Vehicle Care

10-31

Taillamps To replace a taillamp/turn signal lamp or back-up lamp bulb:

1. Remove the two inboard nuts from the inside of the taillamp assembly.

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10-32

Vehicle Care

5. Remove the taillamp assembly

9. Reinstall the bulb socket by

turning it clockwise into the lamp assembly.

10. Reverse Steps 1–5 to reinstall

the taillamp assembly and applique.

Center High-Mounted Stoplamp (CHMSL) The CHMSL is above the rear doors at the center of the vehicle. To replace a bulb:

from the vehicle.

2. The third nut (3) is under the applique piece (2) above the lamp. Remove the two inboard applique nuts. Pull the applique (2) straight rearward slightly to clear the studs. Then rotate the applique (2) just far enough to gain access to the outer push pins (1).

3. Carefully disconnect the push

pins (1) from the applique bracket.

4. Remove the third nut (3) from

the upper outboard side of the lamp.

6. Remove the taillamp/turn signal

lamp (1) or back-up lamp (2) bulb socket by turning it counterclockwise one-quarter turn and pulling it out of the lamp assembly.

7. Remove the bulb by pulling it

straight out.

8. Push the new bulb into the

socket.

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Black plate (33,1)

1. Remove the two screws from the

CHMSL assembly.

2. Remove the CHMSL assembly. 3. Turn the bulb socket

counterclockwise one-quarter turn to remove it from the lamp assembly.

4. Pull the old bulb straight out of

the socket and push the new bulb into the socket.

5. Turn the bulb socket clockwise

one-quarter turn to install it in the lamp assembly.

6. Reinstall the CHMSL assembly

and two screws.

Do not block or damage the CHMSL when items are loaded on the roof of the vehicle.

Vehicle Care

10-33

4. Reverse Steps 1 and 2 to

reinstall the license plate bulb assembly.

Replacement Bulbs

Exterior Lamp

Back-up, Rear Parking, Stoplamp, and Turn Signal Lamp Center High-Mounted Stoplamp (CHMSL) Front Parking and Turn Signal Lamp Front Sidemarker Lamp License Plate Lamp

Bulb

Number 3157KX

912LL

3157KX

194LL

194LL

License Plate Lamp

1. Bulb Socket 2. License Plate Bulb Assembly 3. Screws

To replace one of these bulbs: 1. Remove the screws (3) that secure the license plate bulb assembly (2).

2. Turn the bulb socket (1)

counterclockwise and pull the bulb straight out of the socket. Install the new bulb.

3.

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10-34

Vehicle Care

Exterior Lamp

Headlamps

Composite High-Beam Headlamp Composite Low-Beam Headlamp Sealed Beam Headlamp

Bulb

Number

9005LL

9006LL

H6054

For replacement bulbs not listed here, contact your dealer.

Electrical System

Electrical System Overload The vehicle has fuses and circuit breakers to protect against an electrical system overload. When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers 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, the same amperage fuse can 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 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.

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Vehicle Care

10-35

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 and Circuit Breakers The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of fires caused by electrical problems. 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.

Engine Compartment Fuse Block The fuse block is located 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.

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10-36

Vehicle Care

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

Mini Fuse

Usage

10
11
12

13

Right Stop/Turn Trailer Spare Spare Fuel System Control Module Ignition Body Control Module 5
Body Control Module 7
Body Control Module 4
Instrument Cluster Trailer Wiring Inside Rear Vision Camera Module Spare

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Mini Fuse

Usage

Mini Fuse

Usage

Mini Fuse

Usage

Vehicle Care

10-37

14
16
17
18

19

20
21

22
23
24
25

26

27

28

Windshield Washer Horn Transmission Air Conditioning Compressor Engine Control Module Battery Spare Left Stop/Turn Trailer Spare Spare Fuel Pump Auxiliary Power Outlet Body Control Module 3
Special Equipment Option Airbag

29

30

31

32

33

34
35

36

51

Steering Wheel Sensor Engine Control Module Ignition/ Glow Plug Module Transmission Control Module Ignition Transmission Control Module Battery Rear Parking Aid Module Spare Fuel Operated Heater Module Fuel System Control Module Battery Left High-Beam Headlamp

52

53

54

55
56

58

59

61
62

63
64

Right High-Beam Headlamp Left Low-Beam Headlamp Right Low-Beam Headlamp Wiper Canister Vent Solenoid Body Control Module 2
Body Control Module 1
Spare Oxygen Sensor 2
(Post), EV Fan (Diesel) Spare Mass Air Flow/ Canister Vent

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10-38

Vehicle Care

Mini Fuse

65

66

67

68

69
70
71

72

73

75
76

Usage Odd Ignition/ Injectors Daytime Running Lamps 2
(LOLVL-V22) (If Equipped) Daytime Running Lamps 1 (UPLVL +V22) (If Equipped) Auxiliary Stop Lamps Trailer Stop Lamps Spare Fuel Heater/Flex Fuel Sensor Body Control Module 6
Lighter/Data Link Connection V6 Fuel Injectors Spare

Mini Fuse

Usage

Relay

Usage

15
37
38
39
40

48
49
50
57
60

Run/Crank Spare Fuel Pump Crank Air Conditioning Compressor Fan High Powertrain Spare Fan Low Fan Control

77

78

79

Oxygen Sensor 2 (Pre) Engine Control Module Powertrain Even Ignition/ Injectors

J-Case Fuse

Usage

41
42
43
44
45

46
47
74

ABS Motor ABS Module Spare Trailer Wiring Fan High Starter Solenoid Engine Control Module/Powertrain Spare Fan Lo Front Blower

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Black plate (39,1)

Floor Console Fuse Block

The floor console fuse block is under the driver seat.

Vehicle Care

10-39

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

Mini-Fuse

Usage

F1
F2

F3

F4
F5
F6

F7

F8

F9

F10

F11

Empty Steering Wheel Sensor Auxiliary Parking Lamps (Cut-Away) Front Park Lamps Trailer Park Lamps Upfitter Park Lamps Right Rear Park Lamp Left Rear Park Lamp Outside Rearview Mirror Switch Airbag/Automatic Occupant Sensing OnStar® (If Equipped)

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10-40

Vehicle Care

Mini-Fuse

Usage

Mini-Fuse

Usage

Mini-Fuse

Usage

F12
F13

F14

F15
F17

F18

F19
F20

F21

Empty Heating, Ventilation and Air Conditioning 2
Heating, Ventilation and Air Conditioning 1
Empty Outside Rearview Mirror Heater Rear Window Defogger Compass Radio/Chime/ SiriusXM Satellite Radio (If Equipped) Remote Function Actuator/Tire Pressure Monitor

F22

F23
F25

F26

F27
F30

F31
F32
F33
F34

F35

Ignition Switch/ Discrete Logic Ignition Sensor (PK3) Instrument Cluster Heating, Ventilation and Air Conditioning Control Auxiliary/Trailer Backup Taillamps Backup Upfitter Courtesy Lamps Front Door Lock Rear Door Lock Cargo Door Unlock Passenger Door Unlock Rear Passenger Door Unlock

F36
F37
F38

Driver Door Unlock Empty Empty

J-Case Fuse

Usage

F16

F24
F28

F29

Upfitter Auxiliary 1
Gas Ambulance Empty Upfitter Auxiliary 2
Reading Lamps Gas Ambulance Rear Blower

Relays

Usage

K1

K2

K3

Run (High Current Micro) Empty (High Current Micro) Park Lamps (High Current Micro)

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Relays

Usage

Wheels and Tires

K4

K5

K6

Upfitter Auxiliary 2
(High Current Mini) Rear Defogger (High Current Micro) Retained Accessory Power (RAP) (High Current Micro)

Circuit Breaker

CB1
CB2

Usage

Power Seats Power Windows

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)

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

. 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)

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Vehicle Care

Warning (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.

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 10-42.

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 10-59. 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.

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. 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.

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. 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 is noted when the tires are inspected. See Tire Inspection on page 10-56.

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

Passenger (P-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,

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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.

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Vehicle Care

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.

(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 10-61. (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 10-50 and Vehicle Load Limits on page 9-9.

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.

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(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. This does not apply to Goodyear LT225/75R16 G949
RSA and Goodyear LT225/ 75R16 G933 RSD commercial truck tires. (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 10-50
and Vehicle Load Limits on page 9-9.

(4) 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. 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).

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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. (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 10-50 and Vehicle Load Limits on page 9-9.

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Vehicle Care

Tire Designations

Tire Size The following examples show the different parts of a tire size.

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 height-to-width measurements. For example, if the tire size aspect ratio is 75, as shown in item 3 of the illustration, it would mean that the tire's sidewall is 75 percent as high as it is wide. (4) Construction Code: A letter code is used to indicate the type of ply construction in the tire. The letter R means radial ply construction; the letter D means diagonal or bias ply construction; and the letter B means belted-bias ply construction. (5) Rim Diameter: Diameter of the wheel in inches. (6) Service Description: These characters represent the load index and speed rating of the tire. The load index represents the load carrying capacity a tire

is certified to carry. The speed rating is the maximum speed a tire is certified to carry a load.

Light Truck (LT-Metric) Tire

(1) Light Truck (LT-Metric) Tire: The United States version of a metric tire sizing system. The letters LT as the first two characters in the tire size mean a light truck 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.

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(3) Aspect Ratio: A two-digit number that indicates the tire height-to-width measurements. For example, if the tire size aspect ratio is 75, as shown in item 3 of the light truck (LT-Metric) tire illustration, it would mean that the tire's sidewall is 75 percent as high as it is wide. (4) Construction Code: A letter code is used to indicate the type of ply construction in the tire. The letter R means radial ply construction; the letter D means diagonal or bias ply construction; and the letter B means belted-bias ply construction. (5) Rim Diameter: Diameter of the wheel in inches. (6) Load Range: Load Range.

(7) Service Description: The service description indicates the load index and speed rating of a tire. If two numbers are given as in the example, 120/116, then this represents the load index for single versus dual wheel usage (single/dual). The speed rating is the maximum speed a tire is certified to carry a load. This does not apply to Goodyear LT225/75R16 G949 RSA and Goodyear LT225/75R16 G933
RSD commercial truck tires; see the dual tire and single tire maximum load and load range letter designations on the tire sidewall.

Tire Terminology and Definitions Air Pressure: The amount of air inside the tire pressing outward on each square inch of

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the tire. Air pressure is expressed in kPa (kilopascal) or psi (pounds per square inch). Accessory Weight: The combined weight of optional accessories. Some examples of optional accessories are automatic transmission, power windows, power seats, and air conditioning. Aspect Ratio: The relationship of a tire's height to its width. Belt: A rubber coated layer of cords between the plies and the tread. Cords may be made from steel or other reinforcing materials. Bead: The tire bead contains steel wires wrapped by steel cords that hold the tire onto the rim.

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Vehicle Care

Bias Ply Tire: A pneumatic tire in which the plies are laid at alternate angles less than 90 degrees to the centerline of the tread. Cold Tire Pressure: The amount of air pressure in a tire, measured in kPa (kilopascal) or psi (pounds per square inch) before a tire has built up heat from driving. See Tire Pressure on page 10-50. Curb Weight: The weight of a motor vehicle with standard and optional equipment including the maximum capacity of fuel, oil, and coolant, but without passengers and cargo. DOT Markings: A code molded into the sidewall of a tire signifying that the tire is in compliance with the U.S. Department of Transportation (DOT) Motor Vehicle Safety Standards. The DOT code

includes the Tire Identification Number (TIN), an alphanumeric designator which can also identify the tire manufacturer, production plant, brand, and date of production. GVWR: Gross Vehicle Weight Rating. See Vehicle Load Limits on page 9-9. GAWR FRT: Gross Axle Weight Rating for the front axle. See Vehicle Load Limits on page 9-9. GAWR RR: Gross Axle Weight Rating for the rear axle. See Vehicle Load Limits on page 9-9. Intended Outboard Sidewall: The side of an asymmetrical tire that must always face outward when mounted on a vehicle. Kilopascal (kPa): The metric unit for air pressure.

Light Truck (LT-Metric) Tire: A tire used on light duty trucks and some multipurpose passenger vehicles. Load Index: An assigned number ranging from 1 to 279
that corresponds to the load carrying capacity of a tire. Maximum Inflation Pressure: The maximum air pressure to which a cold tire can be inflated. The maximum air pressure is molded onto the sidewall. Maximum Load Rating: The load rating for a tire at the maximum permissible inflation pressure for that tire. Maximum Loaded Vehicle Weight: The sum of curb weight, accessory weight, vehicle capacity weight, and production options weight.

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Normal Occupant Weight: The number of occupants a vehicle is designed to seat multiplied by 68 kg (150 lb). See Vehicle Load Limits on page 9-9. Occupant Distribution: Designated seating positions. Outward Facing Sidewall: The side of an asymmetrical tire that has a particular side that faces outward when mounted on a vehicle. The side of the tire that contains a whitewall, bears white lettering, or bears manufacturer, brand, and/or model name molding that is higher or deeper than the same moldings on the other sidewall of the tire. Passenger (P-Metric) Tire: A tire used on passenger cars and some light duty trucks and multipurpose vehicles.

Recommended Inflation Pressure: Vehicle manufacturer's recommended tire inflation pressure as shown on the tire placard. See Tire Pressure on page 10-50 and Vehicle Load Limits on page 9-9. Radial Ply Tire: A pneumatic tire in which the ply cords that extend to the beads are laid at 90 degrees to the centerline of the tread. Rim: A metal support for a tire and upon which the tire beads are seated. Sidewall: The portion of a tire between the tread and the bead. Speed Rating: An alphanumeric code assigned to