2012 Buick Lacrosse Owners Manual

Infrequent Usage: Remove the 12‐volt battery black, negative (−) cable from the battery to keep the battery from running down. Extended Storage: Remove the 12‐volt battery black, negative (−) cable from the battery or use a battery trickle charger. Remember to reconnect the battery when ready to drive the vehicle.

The eAssist system high voltage battery is cooled with air drawn from the vehicle interior. The cold air intake for the battery is located behind the rear seat, on the filler panel. Do not cover the intake.

{ 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.

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10-26

Vehicle Care

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. Firmly apply both the parking brake and the regular brake. See Parking Brake on page 9‑34. 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.

1. Before starting this check, be

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

2. Firmly apply the parking brake.

See Parking Brake on page 9‑34. 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.

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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).

. With the key access ignition

system, the ignition key should come out only in LOCK/OFF. See Ignition Positions (Key Access) on page 9‑16 or Ignition Positions (Keyless Access) on page 9‑18.

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.

Vehicle Care

10-27

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 for more information. Replacement blades come in different types and are removed in different ways. For proper type and length, see Maintenance Replacement Parts on page 11‑16.

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10-28

Vehicle Care

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

2. Lift up on the latch in the middle

of the wiper blade where the wiper arm attaches.

3. With the latch open, pull the wiper blade down toward the windshield far enough to release it from the J-hooked end of the wiper arm.

4. Remove the wiper blade.

Allowing the wiper blade arm to touch the windshield when no wiper blade is installed could damage the windshield. Any damage that occurs would not be covered by the vehicle warranty. Do not allow the wiper blade to touch the windshield. 5. Reverse Steps 1 through 3 for

wiper blade replacement.

Headlamp Aiming The headlamp aiming system has been preset at the factory. If the vehicle is damaged in an accident, the aim of the headlamps may be affected and adjustment may be necessary. It is recommended that a dealer adjust the headlamps. To re-aim the headlamps yourself, use the following procedure. The vehicle should be properly prepared as follows:

The vehicle should be placed so the headlamps are 7.6 m (25 ft) from a light‐colored wall. The vehicle must have all four tires on a level surface which is level all the way to the wall. The vehicle should be placed so it is perpendicular to the wall or other flat surface. The vehicle should not have any snow, ice, or mud on it.

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The vehicle should be fully assembled and all other work stopped while headlamp aiming is being performed. The vehicle should be normally loaded with a full tank of fuel and one person or 75 kg (160 lbs) sitting in the driver seat. Tires should be properly inflated.

Headlamp aiming is done with the vehicle's low-beam headlamps. The high-beam headlamps will be correctly aimed if the low-beam headlamps are aimed properly.

Vehicle Care

10-29

To adjust the vertical aim: 1. Open the hood. See Hood on

page 10‑5.

Base

Uplevel

2. Locate the aim dot on the lens of

the low‐beam headlamp.

3. Measure the distance from the

ground to the aim dot on the low‐beam headlamp. Record the distance.

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10-30

Vehicle Care

4. At the wall, measure from the

ground upward (A) to the recorded distance from Step 3 and mark it.

5. Draw or tape a horizontal line (B)

on the wall the width of the vehicle at the height of the mark in Step 4.

Notice: Do not cover a headlamp to improve beam cut-off when aiming. Covering a headlamp may cause excessive heat build-up which may cause damage to the headlamp.

6. Turn on the low-beam

headlamps and place a piece of cardboard or equivalent in front of the headlamp not being adjusted. This allows only the beam of light from the headlamp being adjusted to be seen on the flat surface.

Uplevel

7. Locate the vertical headlamp

aiming screws, which are under the hood near each headlamp assembly.

8. Turn the vertical aiming screw

until the headlamp beam is aimed to the horizontal tape line. Turn it clockwise or counterclockwise to raise or lower the angle of the beam.

Base

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Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 10‑35. 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

10-31

High Intensity Discharge (HID) Lighting

{ WARNING

The low beam high intensity discharge lighting system operates at a very high voltage. If you try to service any of the system components, you could be seriously injured. Have your dealer or a qualified technician service them.

After an HID headlamp bulb has been replaced, the beam might be a slightly different shade than it was originally. This is normal.

9. Make sure that the light from the

headlamp is positioned at the bottom edge of the horizontal tape line. The lamp on the left (A) shows the correct headlamp aim. The lamp on the right (B) shows the incorrect headlamp aim.

10. Repeat Steps 7 through 9 for

the opposite headlamp.

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Vehicle Care

Headlamps, Front Turn Signal and Parking Lamps

Base Headlamp Assembly The base model vehicle has a halogen high-beam headlamp, a low-beam/Daytime Running Lamp (DRL) headlamp, and a turn signal/parking lamp on the headlamp assembly.

3. Remove the bulb socket

from the headlamp by turning counterclockwise one‐quarter turn.

4. Remove the bulb from the

5.

6.

7.

socket. If replacing the high/ low‐beam bulb, pry the two clips on either end of the bulb and pull straight out. Install the new bulb in the socket. Install the bulb socket by turning clockwise one‐quarter turn. If a headlamp bulb was replaced, install the dust cover in the back of the headlamp housing by turning clockwise one‐quarter turn.

To replace one of these bulbs: 1. Open the hood. See Hood on

page 10‑5.

2.

A. Low-Beam Headlamp/DRL B. High-Beam Headlamp C. Parking/Turn Signal Lamp If replacing a headlamp bulb, remove the dust cover from the back of the headlamp housing by turning counterclockwise one‐quarter turn.

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Uplevel Headlamp Assembly The uplevel model vehicle has a high intensity discharge (HID) high/ low beam, a dedicated DRL, and a parking/turn signal lamp on the headlamp assembly. See High Intensity Discharge (HID) Lighting on page 10‑31 for more information. To replace one of these bulbs: 1. Open the hood. See Hood on

page 10‑5.

2. Turn the bulb socket

counterclockwise to remove it from the headlamp assembly. 3. Pull the bulb straight out from

the socket.

4. Push the new bulb into the

socket and reinstall the socket into the headlamp assembly by turning it clockwise.

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

Vehicle Care

10-33

To replace one of these lamps: 1. Open the trunk. See Trunk on

page 2‑12.

2. Remove the fasteners and pull

back the trunk trim.

3. Remove the four plastic wing

nuts holding the taillamp assembly in place.

4. Pull out the taillamp assembly

and disconnect the wiring harness.

5. Turn the bulb socket

counterclockwise to remove it. 6. Pull the old bulb straight out of

the bulb socket.

7. Reverse Steps 1 through 6 to

install.

A. DRL Lamp B. Parking/Turn Signal Lamp

A. Back‐Up Lamp B. Turn Signal Lamp

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5. Push the replacement bulb

straight into the bulb socket and turn the bulb socket clockwise to install it into the lamp assembly.

6. Move the lamp assembly into

the trunk lid, engaging the clip side first.

7. Push on the lamp side opposite the clip until the lamp assembly snaps into place.

10-34

Vehicle Care

License Plate Lamp The license plate lamps for this vehicle are on the trunk lid. To replace one of these bulbs: 1. Open the trunk. See Trunk on

page 2‑12 for more information.

2. Push the end on either of the lamp assemblies (passenger side shown) and then move the lamp assembly down to remove it from the trunk lid.

A. Bulb Socket B. Bulb C. Lamp Assembly

3. Turn the bulb socket (A)

counterclockwise to remove it from the lamp assembly (C).

4. Pull the bulb (B) straight out of

the bulb socket.

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Replacement Bulbs

Electrical System

Exterior Lamp

Back-Up Lamp Daytime Running Lamp (Uplevel) Front Turn Signal/ Parking Lamp Headlamp High Beam (Base) Headlamp Low Beam (Base) License Plate Lamp

Rear Turn Signal

Bulb

Number 921LL

3157K LCP

3757NAK

LCP

H9

H11LL

W5WLL 3757NAK

LCP

For replacement bulbs not listed here, contact your dealer.

High Voltage Devices and Wiring

{ WARNING

Exposure to high voltage can cause shock, burns, and even death. The high voltage components in the vehicle can only be serviced by technicians with special training. High voltage components are identified by labels. Do not remove, open, take apart, or modify these components. High voltage cable or wiring has orange covering. Do not probe, tamper with, cut, or modify high voltage cable or wiring.

Vehicle Care

10-35

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.

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10-36

Vehicle Care

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. 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 damage caused by electrical problems. To check a fuse, look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to 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 possible. To identify and check fuses, circuit breakers, and relays, see Engine Compartment Fuse Block on page 10‑36, Instrument Panel Fuse Block on page 10‑40, and Rear Compartment Fuse Block on page 10‑42.

Engine Compartment Fuse Block

To remove the fuse block cover, squeeze the three retaining clips on the cover and lift it straight up. Notice: Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

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Vehicle Care

10-37

J-Case Fuses

Usage

21

22

24

25

26

27

28

41

42
43

Rear Power Windows Sunroof Front Power Windows Passive Entry/ Passive Start Module — Battery 2
(eAssist) Antilock Brake System Pump Electric Park Brake Rear Window Defogger Brake Vacuum Pump Cooling Fan K2
Not Used

Engine Compartment Fuse Block

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

Usage

J-Case Fuses

12

Wiper Starter

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10-38

Vehicle Care

J-Case Fuses

44

45
59

Mini Fuses

Usage

Mini Fuses

Usage

Mini Fuses

Usage

Transmission Auxiliary Oil Pump (eAssist) Cooling Fan K1
AIR Pump

Usage Transmission Control Module — Battery Engine Control Module Battery Air Conditioning Compressor Clutch Engine Control Module Run/Crank Ignition Coils — Even (Six Cylinder Engine), Ignition Coils — All (Four Cylinder Engine

10

11

13

14

Ignition Coils — Odd (Six Cylinder Engine) Engine Control Module — Switched Battery (from Engine Control Module Relay) Six Cylinder Engine: Post Catalytic Converter Oxygen Sensor Heater, Mass Air Flow Sensor, Flex Fuel Sensor Run/Crank for Transmission Control Module and Fuel System Control Module Cabin Heater Coolant Pump (eAssist)

14

16

17

18

23

29

30

Motor Generator Unit Coolant Pump (eAssist) Run/Crank for eAssist Power Inverter Module Airbag Module — Run/Crank Vented Seats (eAssist) Variable Effort Steering (if equipped) or eAssist Power Inverter Module Power Lumbar, Left Power Lumbar, Right or Power Pack Cooling Fan (eAssist)

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Mini Fuses

31

32

33

34

35

36

37
38
46

Usage Passive Entry/ Passive Start Module — Battery 1
(eAssist) Body Control Module 6
Heated Seat — Front Antilock Brake System Valves Amplifier Adaptive Forward Lighting (AFL) Motors — Battery Right High Beam Left High Beam Cooling Fan Relay

Vehicle Care

10-39

Mini Fuses

Usage

Mini Fuses

Usage

Six Cylinder Engine: Pre Catalytic Converter Oxygen Sensor Heater, Canister Purge Solenoid. Four Cylinder Engine: Pre and Post Catalytic Converter Oxygen Sensor Heaters, Canister Purge Solenoid, Mass Air Flow Sensor. Fog Lamps Right High Intensity Discharge Headlamp Left High Intensity Discharge Headlamp Horn Cluster Run/Crank

47

48

49

50

51
52

53

54

55

56
60
62

64

65

66

67

Run/Crank for Inside Rearview Mirror, Rear Vision Camera Run/Crank for: Heating, Ventilation and Air Conditioning Outside Rearview Mirror, Universal Garage Door Opener, Front Window Switches Windshield Washer Heated Mirror Canister Vent Adaptive Forward Lighting (AFL) Module — Battery Not Used AIR Solenoid (eAssist) Fuel System Control Module

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10-40

Vehicle Care

Mini Fuses

Usage

69

70

Regulated Voltage Control Sensor Ultrasonic Parking Assist/Side Blind Zone

Mini Relays

13
15
16

17

Usage Engine Control Module Cooling Fan Cooling Fan Run/Crank AIR Pump Rear Window Defogger

Micro Relays

Usage

Instrument Panel Fuse Block

10

14

Air Conditioning Compressor Clutch Starter Wiper Speed Wiper Control Cabin Heater Coolant Pump (eAssist) Cooling Fan Headlamp Low Beam

Ultra Micro

Relays

Usage

11

Transmission Auxiliary Oil Pump (eAssist)

The instrument panel fuse block is located in the instrument panel, on the driver side of the vehicle. To access the fuses, open the fuse panel door by pulling down at the top. Press in on the sides of the door to release it from the instrument panel.

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Vehicle Care

10-41

Fuses

Usage

10

11

Steering Wheel Controls Backlight Body Control Module 7
Body Control Module 5
Radio OnStar Power Outlet 1
Power Outlet 2
Body Control Module 1
Body Control Module 4
Body Control Module 8
(J‐Case Fuse) Front Heater Ventilation Air Conditioning/Blower (J‐Case Fuse)

Pull the door toward you to release it from the hinge.

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

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10-42

Vehicle Care

Fuses

Usage

Fuses

Usage

21

22

23

24

25

26

Instrument Panel Cluster Discrete Logic Ignition Switch Body Control Module 3
Body Control Module 2
Rear Heater Ventilation Air Conditioning/Blower AC/DC Inverter

Relays

Usage

R1
R2
R3

Trunk Relay Not Used Power Outlet Relay

12

13

14

15
16

17

18

19

20

Passenger Seat (Circuit Breaker) Driver Seat (Circuit Breaker) Diagnostic Link Connector Airbag Trunk Heater Ventilation Air Conditioning Controller Pre‐Fuse for Fuses 4 and 5
Infotainment and Center Stack Displays, Head‐Up Display, Preferred Device Interface Module, Rear Seat Infotainment (eAssist) Automatic Occupant Sensing

Rear Compartment Fuse Block

The rear compartment fuse block is located on the left side of the trunk behind a cover. Vehicles with eAssist do not have a rear compartment fuse block.

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Vehicle Care

10-43

Mini Fuses

Usage

17

18

19

20

21
22
23
24
25
26
27
28
29

Not Used Passive Entry/ Passive Start Module — Battery 1
(without eAssist) Not Used Run/Crank for Rear Sunshade (without eAssist), Ventilated Seats (without eAssist) Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used

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

Mini Fuses

Usage

Not Used Heated Steering Wheel — Run/Crank (without eAssist)

Mini Fuses

Usage

12
15
16

Not Used Not Used Not Used Not Used Not Used

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10-44

Vehicle Care

Mini Fuses

Usage

30

31

32

33

Not Used Electronic Suspension Control (without eAssist) Rear Seat Infotainment (without eAssist) All‐Wheel Drive (without eAssist)

J‐Case Fuses

Usage

10
11
13

Not Used Not Used Not Used Not Used Not Used Not Used Not Used Not Used

Usage

Wheels and Tires

J‐Case Fuses

14
34

35

36
37

Not Used Not Used Passive Entry/ Passive Start Module — Battery 2
(without eAssist) Not Used Not Used

Relays

Usage

K1

K2

K3

K4

Not Used Run/Crank Relay for Seat Ventilation (without eAssist), Sunshade (without eAssist) Run Relay for Heated Steering Wheel (without eAssist) Not Used

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 and a serious crash. See Vehicle Load Limits on page 9‑10.

(Continued)

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WARNING (Continued)

WARNING (Continued)

. 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.

. 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.

(Continued)

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

Winter Tires Consider installing winter tires on the vehicle if frequent driving on snow or ice covered roads is expected. All season tires provide good overall performance on most surfaces, but they may not offer the traction or the same level of performance as winter tires on snow or ice covered roads.

Vehicle Care

10-45

Winter tires, in general, are designed for increased traction on snow and ice covered roads. 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. See your dealer for details regarding winter tire availability and proper tire selection. Also, see Buying New Tires on page 10‑60. If using snow 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.

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10-46

Vehicle Care

If winter tires with a lower speed rating are chosen, never exceed the tire's maximum speed capability.

Tire Sidewall Labeling Useful information about a tire is molded into its sidewall. The examples show a typical passenger vehicle tire and a compact spare tire sidewall.

Passenger (P‐Metric) Tire Example (A) Tire Size: The tire size 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. (B) 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. (C) 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.

(D) Tire Identification Number (TIN): The letters and numbers following the DOT (Department of Transportation) 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. (E) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread. (F) 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 10‑62.

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(G) Maximum Cold Inflation Load Limit: Maximum load that can be carried and the maximum pressure needed to support that load.

Compact Spare Tire Example

(A) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread.

Vehicle Care

10-47

(D) Maximum Cold Inflation Load Limit: Maximum load that can be carried and the maximum pressure needed to support that load. (E) Tire Inflation: The temporary use tire or compact spare tire should be inflated to 420 kPa (60 psi). For more information on tire pressure and inflation see Tire Pressure on page 10‑51. (F) Tire Size: A combination of letters and numbers define a tire's width, height, aspect ratio, construction type, and service description. The letter T as the first character in the tire size means the tire is for temporary use only.

(B) Temporary Use Only: The compact spare tire or temporary use tire has a tread life of approximately 5 000 km (3,000 mi) and should not be driven at speeds over 105 km/h (65 mph). The compact spare tire is for emergency use when a regular road tire has lost air and gone flat. If the vehicle has a compact spare tire, see Compact Spare Tire on page 10‑89 and If a Tire Goes Flat on page 10‑64. (C) Tire Identification Number (TIN): The letters and numbers following the DOT (Department of Transportation) 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.

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Vehicle Care

(G) 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.

Tire Designations

Tire Size The following is an example of a typical passenger vehicle tire size.

(A) 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. (B) Tire Width: The three‐digit number indicates the tire section width in millimeters from sidewall to sidewall. (C) Aspect Ratio: A two‐digit number that indicates the tire height‐to‐width measurements. For example, if the tire size aspect ratio is 60, as shown in item C of the illustration, it would mean that the tire's sidewall is 60 percent as high as it is wide.

(D) 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. (E) Rim Diameter: Diameter of the wheel in inches. (F) 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.

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Tire Terminology and Definitions Air Pressure: The amount of air inside the tire pressing outward on each square inch of 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 steering, power brakes, 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 that is located 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. 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 10‑51. 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.

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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 9‑10. GAWR FRT: Gross Axle Weight Rating for the front axle. See Vehicle Load Limits on page 9‑10. GAWR RR: Gross Axle Weight Rating for the rear axle. See Vehicle Load Limits on page 9‑10.

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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. Normal Occupant Weight: The number of occupants a vehicle is designed to seat multiplied by 68 kg (150 lbs). See Vehicle Load Limits on page 9‑10. 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 10‑51
andVehicle Load Limits on page 9‑10. 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.

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Speed Rating: An alphanumeric code assigned to a tire indicating the maximum speed at which a tire can operate. Traction: The friction between the tire and the road surface. The amount of grip provided. Tread: The portion of a tire that comes into contact with the road. Treadwear Indicators: Narrow bands, sometimes called wear bars, that show across the tread of a tire when only 1.6 mm (1/16 in) of tread remains. See When It Is Time for New Tires on page 10‑59. UTQGS (Uniform Tire Quality Grading Standards): A tire information system that provides consumers with ratings for a tire's traction, temperature, and treadwear.

Ratings are determined by tire manufacturers using government testing procedures. The ratings are molded into the sidewall of the tire. See Uniform Tire Quality Grading on page 10‑62. Vehicle Capacity Weight: The number of designated seating positions multiplied by 68 kg (150 lbs) plus the rated cargo load. See Vehicle Load Limits on page 9‑10. Vehicle Maximum Load on the Tire: Load on an individual tire due to curb weight, accessory weight, occupant weight, and cargo weight. Vehicle Placard: A label permanently attached to a vehicle showing the vehicle capacity weight and the original equipment tire size and recommended inflation pressure.

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See “Tire and Loading Information Label” under Vehicle Load Limits on page 9‑10.

Tire Pressure Tires need the correct amount of air pressure to operate effectively. Notice: Neither tire underinflation nor overinflation is good. Underinflated tires, or tires that do not have enough air, can result in:

. Tire overloading and

overheating which could lead to a blowout.

. Premature or

irregular wear. . Poor handling. . Reduced fuel economy.

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Overinflated tires, or tires that have too much air, can result in:

. Unusual wear. . Poor handling. . Rough ride. . Needless damage from

road hazards.

The Tire and Loading Information label on the vehicle indicates the original equipment tires and the correct cold tire inflation pressures. The recommended pressure is the minimum air pressure needed to support the vehicle's maximum load carrying capacity. For additional information regarding how much weight the vehicle can carry, and an example of the Tire and Loading Information label, see Vehicle Load Limits on page 9‑10. How the vehicle is loaded affects

vehicle handling and ride comfort. Never load the vehicle with more weight than it was designed to carry.

When to Check Check the tires once a month or more. Do not forget the compact spare tire, if the vehicle has one. The compact spare should be at 420 kPa (60 psi). For additional information regarding the compact spare tire, see Compact Spare Tire on page 10‑89.

How to Check Use a good quality pocket-type gauge to check tire pressure. Proper tire inflation cannot be determined by looking at the tire. Check the tire inflation pressure when the tires are cold, meaning the vehicle has not been driven for at least three hours or no more than 1.6 km (1 mi).

Remove the valve cap from the tire valve stem. Press the tire gauge firmly onto the valve to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until the recommended pressure is reached. If the inflation pressure is high, press on the metal stem in the center of the tire valve to release air. Re‐check the tire pressure with the tire gauge. Return the valve caps on the valve stems to prevent leaks and keep out dirt and moisture.

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Tire Pressure Monitor System The Tire Pressure Monitor System (TPMS) uses radio and sensor technology to check tire pressure levels. The TPMS sensors monitor the air pressure in your tires and transmit tire pressure readings to a receiver located in the vehicle. Each tire, including the spare (if provided), should be checked monthly when cold and inflated to the inflation pressure recommended by the vehicle manufacturer on the vehicle placard or tire inflation pressure label. (If your vehicle has tires of a different size than the size indicated on the vehicle placard or tire inflation pressure label, you should determine the proper tire inflation pressure for those tires.) As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire

pressure telltale when one or more of your tires is significantly under‐ inflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly under‐inflated tire causes the tire to overheat and can lead to tire failure. Under‐inflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if under‐inflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale. Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly.

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The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start‐ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly. See Tire Pressure Monitor Operation on page 10‑54 for additional information.

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Federal Communications Commission (FCC) Rules and with Industry Canada Standards See Radio Frequency Statement on page 13‑20 for information regarding Part 15 of the Federal Communications Commission (FCC) Rules and with Industry Canada Standards RSS-GEN/210/220/310.

Tire Pressure Monitor Operation This vehicle may have a Tire Pressure Monitor System (TPMS). The TPMS is designed to warn the driver when a low tire pressure condition exists. TPMS sensors are mounted onto each tire and wheel assembly, excluding the spare tire and wheel assembly. The TPMS sensors monitor the air pressure in the tires and transmits the tire pressure readings to a receiver located in the vehicle.

details about the DIC operation and displays see Driver Information Center (DIC) on page 5‑25. The low tire pressure warning light may come on in cool weather when the vehicle is first started, and then turn off as the vehicle is driven. This could be an early indicator that the air pressure is getting low and needs to be inflated to the proper pressure. A Tire and Loading Information label, attached to your vehicle, shows the size of the original equipment tires and the correct inflation pressure for the tires when they are cold. See Vehicle Load Limits on page 9‑10, for an example of the Tire and Loading Information label and its location. Also see Tire Pressure on page 10‑51. The TPMS can warn about a low tire pressure condition but it does not replace normal tire maintenance.

When a low tire pressure condition is detected, the TPMS illuminates the low tire pressure warning light located on the instrument cluster. If the warning light comes on, stop as soon as possible and inflate the tires to the recommended pressure shown on the tire loading information label. See Vehicle Load Limits on page 9‑10. A message to check the pressure in a specific tire displays in the Driver Information Center (DIC). The low tire pressure warning light and the DIC warning message come on at each ignition cycle until the tires are inflated to the correct inflation pressure. Using the DIC, tire pressure levels can be viewed. For additional information and

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See Tire Inspection on page 10‑57, Tire Rotation on page 10‑58 and Tires on page 10‑44. Notice: Tire sealant materials are not all the same. A non-approved tire sealant could damage the TPMS sensors. TPMS sensor damage caused by using an incorrect tire sealant is not covered by the vehicle warranty. Always use only the GM-approved tire sealant available through your dealer or included in the vehicle. Factory-installed Tire Inflator Kits use a GM approved liquid tire sealant. Using non-approved tire sealants could damage the TPMS sensors. See Tire Sealant and Compressor Kit (With Pressure Relief Button) on page 10‑67 or Tire Sealant and Compressor Kit (With Pressure Deflation Button) on page 10‑74 for information regarding the inflator kit materials and instructions.

TPMS Malfunction Light and Message The TPMS will not function properly if one or more of the TPMS sensors are missing or inoperable. When the system detects a malfunction, the low tire warning light flashes for about one minute and then stays on for the remainder of the ignition cycle. A DIC warning message also displays. The malfunction light and DIC warning message come on at each ignition cycle until the problem is corrected. Some of the conditions that can cause these to come on are: . One of the road tires has been

replaced with the spare tire. The spare tire does not have a TPMS sensor. The malfunction light and DIC message should go off after the road tire is replaced and the sensor matching process is performed successfully. See “TPMS Sensor Matching Process” later in this section.

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The TPMS sensor matching process was not done or not completed successfully after rotating the tires. The malfunction light and the DIC message should go off after successfully completing the sensor matching process. See "TPMS Sensor Matching Process" later in this section. . One or more TPMS sensors

are missing or damaged. The malfunction light and the DIC message should go off when the TPMS sensors are installed and the sensor matching process is performed successfully. See your dealer for service.

. Replacement tires or wheels do not match the original equipment tires or wheels. Tires and wheels other than those recommended could prevent the TPMS from functioning properly. See Buying New Tires on page 10‑60.

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. Operating electronic devices or being near facilities using radio wave frequencies similar to the TPMS could cause the TPMS sensors to malfunction.

If the TPMS is not functioning properly it cannot detect or signal a low tire condition. See your dealer for service if the TPMS malfunction light and DIC message comes on and stays on. TPMS Sensor Matching Process Each TPMS sensor has a unique identification code. The identification code needs to be matched to a new tire/wheel position after rotating the vehicle’s tires or replacing one or more of the TPMS sensors. The TPMS sensor matching process