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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 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 inch) of tread remains. See When It Is Time for New Tires on page 10‑58.
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 10‑61. 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 9‑27. 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's capacity weight and the original equipment tire size and recommended inflation pressure. See “Tire and Loading Information Label” under Vehicle Load Limits on page 9‑27.
Tire Pressure Tires need the correct amount of air pressure to operate effectively. Notice: Do not let anyone tell you that under‐inflation or over‐inflation is all right. It is not. If your tires do not have enough air (under‐inflation), you can get the following:
. Too much flexing . Too much heat . Tire overloading
. Premature or irregular wear . Poor handling . Reduced fuel economy
If your tires have too much air (over‐inflation), you can get the following:
. Unusual wear . Poor handling . Rough ride . Needless damage from
road hazards
A vehicle specific Tire and Loading Information label is attached to your vehicle. This label shows your vehicle's original equipment tires and the correct inflation pressures for your tires when they are cold. The recommended cold tire inflation pressure, shown on the label, is the minimum amount of
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air pressure needed to support your vehicle's maximum load carrying capacity. For additional information regarding how much weight your vehicle can carry, and an example of the Tire and Loading Information label, see Vehicle Load Limits on page 9‑27. How you load your vehicle affects vehicle handling and ride comfort. Never load your vehicle with more weight than it was designed to carry.
When to Check Check your tires once a month or more. Also check the tire pressure of the spare tire. If your vehicle has a compact spare tire, it should be at 60 psi (420 kPa). See Full-Size Spare Tire on page 10‑85 for additional information.
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How to Check Use a good quality pocket-type gauge to check tire pressure. You cannot tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they are underinflated. Check the tire's inflation pressure when the tires are cold. Cold means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). 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 you reach the recommended amount.
If you overfill the tire, release air by pushing on the metal stem in the center of the tire valve. Recheck the tire pressure with the tire gauge. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture.
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 vehicle's 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. 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 10‑53 for additional information. Federal Communications Commission (FCC) and Industry Canada See Radio Frequency Statement on page 13‑16 for information regarding Part 15 of the Federal Communications Commission (FCC) Rules and RSS-210/211 of Industry Canada.
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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 on the vehicle, excluding the spare tire. The TPMS sensors monitor the air pressure in the vehicle's tires and transmit the tire pressure readings to a receiver located in the vehicle.
When a low tire pressure condition is detected, the TPMS illuminates the low tire pressure warning light located on the instrument panel cluster.
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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 9‑27. At the same time, a Driver Information Center (DIC) message is displayed on the DIC display screen. 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. For additional information and details about the DIC operation and displays see Tire Messages 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 you start to drive. This could be an early indicator that the air pressure in the tire(s) are getting low and need to be inflated to the proper pressure.
A Tire and Loading Information label, attached to the vehicle, shows the size of the vehicle's original equipment tires and the correct inflation pressure for the vehicle's tires when they are cold. See Vehicle Load Limits on page 9‑27 , for an example of the Tire and Loading Information label and its location on the vehicle. Also see Tire Pressure on page 10‑51. The vehicle's TPMS can warn you about a low tire pressure condition but it does not replace normal tire maintenance. See Tire Inspection on page 10‑57, Tire Rotation on page 10‑57 and Tires on page 10‑44. Notice: Liquid tire sealants could damage the Tire Pressure Monitor System (TPMS) sensors. Sensor damage caused by using a tire sealant is not covered by your warranty. Do not use liquid tire sealants.
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 is also displayed. The low tire warning light and DIC warning message come on at each ignition cycle until the problem is corrected. Some of the conditions that can cause the malfunction light and DIC message 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 TPMS malfunction light and DIC message should go off once you re‐install the road tire containing the TPMS sensor.
.
The TPMS sensor matching process was started but not completed or not completed successfully after rotating the vehicle's tires. The DIC message and TPMS malfunction light should go off once the TPMS sensor matching process is performed successfully. See “TPMS Sensor Matching Process” later in this section. . One or more TPMS sensors
are missing or damaged. The DIC message and the TPMS malfunction light should go off when the TPMS sensors are installed and the sensor matching process is performed successfully. See your dealer/retailer for service.
. Replacement tires or wheels do not match the vehicle's original equipment tires or wheels. Tires and wheels other than those recommended for the vehicle could prevent the TPMS from functioning properly. See Buying New Tires on page 10‑59.
. 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 it cannot detect or signal a low tire condition. See your dealer/retailer for service if the TPMS malfunction light and DIC message comes on and stays on.
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TPMS Sensor Matching Process Each TPMS sensor has a unique identification code. Any time you replace one or more of the TPMS sensors or rotate the vehicle's tires, the identification codes need to be matched to the new tire/wheel position. The sensors are matched to the tire/wheel positions in the following order: driver side front tire, passenger side front tire, passenger side rear tire, and driver side rear tire using a TPMS diagnostic tool. See your dealer/retailer for service. The TPMS sensors can also be matched to each tire/wheel position by increasing or decreasing the tire's air pressure. If increasing the tire's air pressure, do not exceed the maximum inflation pressure indicated on the tire's sidewall. To let air-pressure out of a tire you can use the pointed end of the valve cap, a pencil-style air pressure gauge, or a key.
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You have one minute to match the first tire/wheel position, and five minutes overall, to match all four tire/wheel positions. If it takes longer than one minute, to match the first tire and wheel, or more than five minutes to match all four tire and wheel positions, the matching process stops and you need to start over. The TPMS sensor matching procedure is outlined below: 1. Set the parking brake. 2. Turn the ignition switch to
ON/RUN with the engine off. 3. Turn the exterior lamp switch from AUTO to OFF four times within three seconds. A double horn chirp will sound and the TPMS low tire warning light starts flashing. The double horn chirp and flashing TPMS warning light indicates the TPMS matching process has started. The TPMS
warning light should continue flashing throughout the matching procedure. The LOW TIRE message displays on the Driver Information Center (DIC). 4. Start with the driver side
front tire.
5. Remove the valve cap from the
valve cap stem. Activate the TPMS sensor by increasing or decreasing the tire's air pressure for 10 seconds, then stop and listen for a single horn chirp. The single horn chirp should sound within 15 seconds, confirming that the sensor identification code has been matched to this tire and wheel position. If you do not hear the confirming single horn chirp, turn the ignition switch to LOCK and start over beginning with Step 2.
6. Proceed to the passenger
side front tire, and repeat the procedure in Step 5.
7. Proceed to the passenger side
rear tire, and repeat the procedure in Step 5.
8. Proceed to the driver side rear
tire, and repeat the procedure in Step 5.
9. After hearing the confirming horn chirp for the driver side rear tire, check to see if the TPMS low tire warning light and the DIC LOW TIRE messages have turned off. If yes, the TPMS sensors have been relearned. Turn the ignition switch to LOCK/OFF. If the low tire warning light and the SERV TPM message on the DIC are on after completing Step 5 for the driver side rear tire, the sensor relearn process has not been successful. Turn the ignition switch to LOCK/OFF and repeat the matching process beginning with Step 2.
10. Set all four tires to the
recommended air pressure level as indicated on the Tire and Loading Information label. 11. Put the valve caps back on the
valve stems.
Tire Inspection We recommend that you regularly inspect your vehicle's tires, including the spare tire, if the vehicle has one, for signs of wear or damage. See When It Is Time for New Tires on page 10‑58 for more information.
Tire Rotation Tires should be rotated every 5,000 to 8,000 miles (8 000 to 13 000 km). See Scheduled Maintenance on page 11‑2.
The purpose of a regular tire rotation is to achieve a uniform wear for all tires on the vehicle. This will ensure that the vehicle continues to perform most like it did when the tires were new. The first rotation is the most important. See Scheduled Maintenance on page 11‑2. Any time you notice unusual wear, rotate the tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 10‑58 and Wheel Replacement on page 10‑63. Make sure the spare tire is stored securely. Push, pull and then try to rotate or turn the tire. If it moves, use the wheel wrench/hoist shaft to tighten the cable. See If a Tire Goes Flat on page 10‑64.
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When rotating the vehicle's tires, always use the correct rotation pattern shown here. Do not include the spare tire in the tire rotation. After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Tire and Loading Information label. See Tire Pressure on page 10‑51 and Vehicle Load Limits on page 9‑27.
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Reset the Tire Pressure Monitor System. See Tire Pressure Monitor Operation on page 10‑53. Make certain that all wheel nuts are properly tightened. See “Wheel Nut Torque” under Capacities and Specifications on page 12‑2.
{ WARNING
Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after time. The wheel could come off and cause an accident. When changing a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. See If a Tire Goes Flat on page 10‑64.
When It Is Time for New Tires Various factors, such as maintenance, temperatures, driving speeds, vehicle loading, and road conditions influence when you need new tires.
One way to tell when it is time for new tires is to check the treadwear indicators, which appear when the tires have only 1.6 mm (1/16 inch) or less of tread remaining.
The vehicle needs new tires if any of the following statements are true: . You can see the indicators at three or more places around the tire.
. You can see cord or fabric showing through the tire's rubber. The tread or sidewall is cracked, cut, or snagged deep enough to show cord or fabric. The tire has a bump, bulge, or split. The tire has a puncture, cut, or other damage that cannot be repaired well because of the size or location of the damage.
The rubber in tires degrades over time. This is also true for the spare tire, if the vehicle has one, even if it is not being used. Multiple conditions affect how fast this aging takes place, including temperatures, loading conditions, and inflation pressure maintenance. With proper care and maintenance tires typically wear out before they degrade due to age. If you are unsure about the need to replace the tires as they get older, consult the tire manufacturer for more information.
Buying New Tires GM has developed and matched specific tires for your vehicle. The original equipment tires installed on your vehicle, when it was new, were designed to
meet General Motors Tire Performance Criteria Specification (TPC spec) system rating. If you need replacement tires, GM strongly recommends that you get tires with the same TPC Spec rating. This way, your vehicle will continue to have tires that are designed to give the same performance and vehicle safety, during normal use, as the original tires. GM's exclusive TPC Spec system considers over a dozen critical specifications that impact the overall performance of your vehicle, including brake system performance, ride and handling, traction control, and
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tire pressure monitoring performance. GM's TPC Spec number is molded onto the tire's sidewall near the tire size. If the tires have an all‐season tread design, the TPC spec number will be followed by a MS, for mud and snow. See Tire Sidewall Labeling on page 10‑44
for additional information. GM recommends replacing tires in sets of four. This is because uniform tread depth on all tires will help keep your vehicle performing most like it did when the tires were new. Replacing less than a full set of tires can affect the braking and handling performance of your vehicle.10-60
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See Tire Inspection on page 10‑57
and Tire Rotation on page 10‑57
for information on proper tire rotation.{ WARNING
Mixing tires could cause you to lose control while driving. If you mix tires of different sizes, brands, or types (radial and bias-belted tires) the vehicle may not handle properly, and you could have a crash. Using tires of different sizes, brands, or types may also cause damage to your vehicle. Be sure to use the correct size, brand, and type of tires on your vehicle's wheels.
{ WARNING
If you use bias-ply tires on the vehicle, the wheel rim flanges could develop cracks after many miles of driving. A tire and/or wheel could fail suddenly, causing a crash. Use only radial-ply tires with the wheels on the vehicle.
If you must replace your vehicle's tires with those that do not have a TPC Spec number, make sure they are the same size, load range, speed rating, and construction type (radial and bias‐belted tires) as your vehicle's original tires. Vehicles equipped with a tire pressure monitoring system may give an inaccurate low‐pressure warning if non‐TPC spec rated tires are installed on your vehicle. Non‐TPC Spec rated
tires may give a low‐pressure warning that is higher or lower than the proper warning level you would get with TPC Spec rated tires. See Tire Pressure Monitor System on page 10‑52. Your vehicle's original equipment tires are listed on the Tire and Loading Information Label. See Vehicle Load Limits on page 9‑27, for more information about the Tire and Loading Information Label and its location on your vehicle.
Different Size Tires and Wheels If you add wheels or tires that are a different size than your original equipment wheels and tires, this could affect the way your vehicle performs, including its braking, ride and handling characteristics, stability, and resistance to rollover.
Additionally, if your vehicle has electronic systems such as anti‐lock brakes, rollover airbags, traction control, and electronic stability control, the performance of these systems can be affected. { WARNING If you add different sized wheels, your vehicle may not provide an acceptable level of performance and safety if tires not recommended for those wheels are selected. You may increase the chance that you will crash and suffer serious injury. Only use Hummer specific wheel and tire systems developed for your vehicle, and have them properly installed by a GM certified technician.
See Buying New Tires on page 10‑59 and Accessories and Modifications on page 10‑3 for additional information.
Uniform Tire Quality Grading Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example:
Treadwear 200 Traction AA Temperature A The following information relates to the system developed by the United States National Highway Traffic Safety Administration (NHTSA), which grades tires by treadwear, traction, and temperature performance. This applies only to vehicles sold in the United States. The grades are molded on the sidewalls of most passenger car tires. The Uniform Tire Quality Grading (UTQG) system does not apply to deep tread, winter-type snow tires,
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space-saver, or temporary use spare tires, tires with nominal rim diameters of 10 to 12 inches (25 to 30 cm), or to some limited-production tires. While the tires available on Hummer light trucks may vary with respect to these grades, they must also conform to federal safety requirements and additional General Motors Tire Performance Criteria (TPC) standards. All Passenger Car Tires Must Conform to Federal Safety Requirements In Addition To These Grades.
Treadwear The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.
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For example, a tire graded 150
would wear one and a half (1½) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.Traction – AA, A, B, C The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics.
Temperature – A, B, C The temperature grades are A (the highest), B, and C, representing the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Safety
Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law. Warning: The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure.
Wheel Alignment and Tire Balance The tires and wheels on the vehicle were aligned and balanced carefully at the factory to give the longest tire life and best overall performance. Adjustments to wheel alignment and tire balancing will not be necessary on a regular basis. However, if there is unusual tire wear or the vehicle pulls to one side or the other, the alignment should be checked.
If the vehicle vibrates when driving on a smooth road, the tires and wheels might need to be rebalanced. See your dealer for proper diagnosis.
Wheel Replacement Replace any wheel that is bent, cracked, or badly rusted or corroded. If wheel nuts keep coming loose, the wheel, wheel bolts, and wheel nuts should be replaced. If the wheel leaks air, replace it (except some aluminum wheels, which can sometimes be repaired). See your dealer if any of these conditions exist. Your dealer will know the kind of wheel you need. Each new wheel should have the same load-carrying capacity, diameter, width, offset, and be mounted the same way as the one it replaces.
If you need to replace any of the wheels, wheel bolts, wheel nuts, or Tire Pressure Monitor System (TPMS) sensors, replace them only with new GM original equipment parts. This way, you will be sure to have the right wheel, wheel bolts, wheel nuts, and TPMS sensors for the vehicle.
{ WARNING
Using the wrong replacement wheels, wheel bolts, or wheel nuts on your vehicle can be dangerous. It could affect the braking and handling of your vehicle, make your tires lose air and make you lose control. You could have a collision in which you or others could be injured. Always use the correct wheel, wheel bolts, and wheel nuts for replacement.
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Notice: The wrong wheel can also cause problems with bearing life, brake cooling, speedometer or odometer calibration, headlamp aim, bumper height, vehicle ground clearance, and tire or tire chain clearance to the body and chassis. See If a Tire Goes Flat on page 10‑64 for more information. Used Replacement Wheels
{ WARNING
Putting a used wheel on the vehicle is dangerous. You cannot know how it has been used or how far it has been driven. It could fail suddenly and cause a crash. If you have to replace a wheel, use a new GM original equipment wheel.
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Tire Chains
{ WARNING
If your vehicle has LT285/75R16
or P265/65R18 size tires, do not use tire chains. They can damage your vehicle because there is not enough clearance. Tire chains used on a vehicle without the proper amount of clearance can cause damage to the brakes, suspension, or other vehicle parts. The area damaged by the tire chains could cause you to lose control of your vehicle and you or others may be injured in a crash. Use another type of traction device only if its manufacturer recommends it for use on your vehicle and tire size combination and road conditions. Follow that manufacturer's instructions.(Continued)
WARNING (Continued)
To help avoid damage to your vehicle, drive slowly, readjust, or remove the device if it is contacting your vehicle, and do not spin your vehicle's wheels. If you do find traction devices that will fit, install them on the rear tires.
Notice: If your vehicle has a tire size other than LT285/75R16 or P265/65R18 use tire chains only where legal and only when you must. Use chains that are the proper size for your tires. Install them on the tires of the rear axle. Do not use chains on the tires of the front axle. Tighten them as tightly as possible with the ends securely fastened. Drive slowly and follow the chain manufacturer's instructions.
If you can hear the chains contacting your vehicle, stop and retighten them. If the contact continues, slow down until it stops. Driving too fast or spinning the wheels with chains on will damage your vehicle.
If a Tire Goes Flat It is unusual for a tire to blowout while you are driving, especially if you maintain your vehicle's tires properly. If air goes out of a tire, it is much more likely to leak out slowly. But if you should ever have a blowout, here are a few tips about what to expect and what to do: If a front tire fails, the flat tire creates a drag that pulls the vehicle toward that side. Take your foot off the accelerator pedal and grip the steering wheel firmly. Steer to maintain lane position, and then gently brake to a stop well out of the traffic lane.
A rear blowout, particularly on a curve, acts much like a skid and may require the same correction you would use in a skid. In any rear blowout remove your foot from the accelerator pedal. Get the vehicle under control by steering the way you want the vehicle to go. It may be very bumpy and noisy, but you can still steer. Gently brake to a stop, well off the road if possible.
{ WARNING Lifting a vehicle and getting under it to do maintenance or repairs is dangerous without the appropriate safety equipment and training. If a jack is provided with the vehicle, it is designed only for changing a flat tire. If it is used for anything else, you or others could be badly injured or killed if the vehicle slips off the jack. If a jack is provided with the vehicle, only use it for changing a flat tire.
If a tire goes flat, avoid further tire and wheel damage by driving slowly to a level place. Turn on your hazard warning flashers. See Hazard Warning Flashers on page 6‑5 .
{ WARNING
Changing a tire can be dangerous. The vehicle can slip off the jack and roll over or fall on you or other people. You and they could be badly injured or even killed. Find a level place to change your tire. To help prevent the vehicle from moving:
1. Set the parking brake firmly. 2. Put the shift lever in
3.
P (Park). If you have a four-wheel-drive vehicle, be sure the transfer case is in a drive gear – not in N (Neutral).
(Continued)
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WARNING (Continued)
4. Turn off the engine and do not restart while the vehicle is raised.
5. Do not allow passengers to
remain in the vehicle.
To be even more certain the vehicle will not move, put blocks at the front and rear of the tire farthest away from the one being changed. That would be the tire on the other side, at the opposite end of the vehicle.
When the vehicle has a flat tire, the wheel blocks need to be set up before changing it. The wheel blocks are located in the tool bag in the swing-gate for H3 models or below the rear seat for H3T models.
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See Tire Changing (H3T) on page 10‑66 or Tire Changing (H3) on page 10‑75 for more information.
A. Wheel Block B. Flat Tire The following information explains how to use the jack and change a tire.
To use the wheel blocks, lift the wheel block and lock it into place. Use the following example as a guide to assist in the placement of the wheel blocks (A) when the vehicle has a flat tire (B).
Tire Changing (H3T)
Removing the Spare Tire and Tools To access the jack and tools located under the rear seat:
1. Turn the wing nut (A)
counterclockwise to release the jack and tools.
2. Remove the jack and tool kit
from the bracket.
3. Release the straps (B) that
secure the tool bag to the jack.
The following tools are used to remove the spare tire and flat tire.
To access the spare tire:
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1. Assemble the two jack handle
extensions (F) and wheel wrench (G).
A. Wheel Wrench B. Jack Handle Extensions C. Jack Handle D. Jack E. Wheel Blocks
A. Spare Tire/Flat Tire (Valve Stem
Pointed Down)
B. Tire/Wheel Retainer C. Hoist Cable D. Hoist Assembly E. Hoist Shaft F. Jack Handle Extension(s) G. Wheel Wrench H. Hoist Shaft Access Ramp I. Hoist End of the Extension Tool
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2.
Insert the hoist end of the extension tool (I) through the hoist shaft access ramp (H).
3. The hoist end of the extension
tool (I) must connect to the hoist shaft (E). The hoist end of the extension tool is used to lower the spare tire. Do not use the chiseled end of the wheel wrench.
4. Turn the wheel wrench (G)
counterclockwise to lower the spare tire (A) to the ground. Continue to turn the wheel wrench (G) until the spare tire (A) can be pulled from under the vehicle. If the spare tire does not lower to the ground, the secondary latch is engaged. See Secondary Latch System on page 10‑84.
5. Pull the spare tire towards you.
6. Tilt the tire, with slack in the
cable, to access the tire/wheel retainer (B).
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Removing the Flat Tire and Installing the Spare Tire 1. Do a safety check before
proceeding. See If a Tire Goes Flat on page 10‑64 for more information.
7. Separate the retainer from the
guide pin by sliding the retainer up the pin while pressing down on the latch. When the retainer is separated from the guide pin, tilt the retainer and pull it through the center of the wheel along with the cable and guide pin.
8. Put the spare tire near the
flat tire.
3. Turn the wheel wrench
counterclockwise to loosen the wheel nuts. Do not remove them yet. If the vehicle has locking lug nuts, the key is supplied in the tool bag. Use the key along with the wheel wrench to remove the wheel nuts from the tire. Now jack up the vehicle.
2. Remove the center cap by
placing the flat end of the wheel wrench in the slot on the wheel and gently pry the center cap out.
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5. Assemble the jack and tools as
follows:
Jacking Locations (Overall View)
A. Front Position - Lower
Control Arm
B. Rear Position - Lower Axle
4. Locate the vehicle's jacking
positions (A and B).
Front Position
Front Tire Flat: If the flat tire is on a front tire of the vehicle, use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack handle extensions. Attach the jack handle to the jack.
From the front of the vehicle position the jack on the front lower control arm along the bar that runs front to back. Turn the wheel wrench clockwise to raise the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to clear the ground.
Rear Positions
Refer to the graphic above to locate the placement of the jack if the flat tire is on the rear of the vehicle.
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{ WARNING
{ WARNING
Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack.
{ WARNING
Raising your vehicle with the jack improperly positioned can damage the vehicle and even make the vehicle fall. To help avoid personal injury and vehicle damage, be sure to fit the jack lift head into the proper location before raising the vehicle.
7. Remove all the wheel nuts and
take off the flat tire.
Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after time. The wheel could come off and cause an accident. When changing a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. See If a Tire Goes Flat on page 10‑64.
8. Remove any rust or dirt from the
wheel bolts, mounting surfaces and spare wheel.
Rear Tire Flat: Use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack extensions. Attach the jack handle to the jack. From the rear of the vehicle align the jack under the rear axle. Turn the wheel wrench clockwise to raise the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to clear the ground.
6. Turn the wheel wrench
clockwise to raise the jack head to the lifting point.
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Vehicle Care
{ WARNING
{ WARNING
Never use oil or grease on bolts or nuts because the nuts might come loose. The vehicle's wheel could fall off, causing a crash.
9. Put the spare tire on the
mounting surface.
10. Put the wheel nuts back on with the rounded end of the nuts toward the wheel after mounting the spare.
11. Tighten each wheel nut by hand. Then use the wheel wrench to tighten the nuts until the wheel is held against the hub.
12. Turn the wheel wrench
counterclockwise to lower the vehicle. Lower the jack completely.
Wheel nuts that are improperly or incorrectly tightened can cause the wheels to become loose or come off. The wheel nuts should be tightened with a torque wrench to the proper torque specification after replacing. Follow the torque specification supplied by the aftermarket manufacturer when using accessory locking wheel nuts. See Capacities and Specifications on page 12‑2 for original equipment wheel nut torque specifications.
Notice: Improperly tightened wheel nuts can lead to brake pulsation and rotor damage. To avoid expensive brake repairs, evenly tighten the wheel nuts in the proper sequence and to the proper torque specification. See Capacities and Specifications on page 12‑2 for the wheel nut torque specification.
13. Tighten the nuts firmly in a
crisscross sequence as shown by turning the wheel wrench clockwise.
14. After installing the wheel and tire, reinstall the center cap. Place the cap on the wheel and tap it into place until it sits flush with the wheel.
Storing a Flat or Spare Tire and Tools
{ WARNING
Storing a jack, a tire, or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all these in the proper place.
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To store the flat or spare tire on the spare tire mount: 1. Place the flat or spare tire (A) on
the ground at the rear of the vehicle with the valve stem pointed down and to the rear.
A. Spare Tire/Flat Tire (Valve Stem
Pointed Down)
B. Tire/Wheel Retainer C. Hoist Cable D. Hoist Assembly E. Hoist Shaft F. Jack Handle Extension(s) G. Wheel Wrench H. Hoist Shaft Access Ramp I. Hoist End of the Extension Tool
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Vehicle Care
2. Tilt the tire. Separate the
4. Assembly the two jack handle
5.
extensions (F) and wheel wrench (G).
tire/wheel retainer (B) from the guide pin. Pull the pin through the center of the wheel. Tilt the tire/wheel retainer (B) down through the center wheel opening.
3. Make sure the tire/wheel
retainer (B) is fully seated across the underside of the wheel.
Insert the hoist end of the extension tool (I) through the hoist shaft access ramp (H).
6. Raise the tire part upward. Make sure the tire/wheel retainer (B) is seated in the wheel opening. 7. Raise the tire fully against the
underside of the vehicle by turning the wheel wrench clockwise until you hear two clicks or feel it skip twice. You cannot overtighten the cable.
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Tire Changing (H3)
Removing the Spare Tire and Tools The equipment needed is located in the swing-gate, behind a cover. To remove the equipment: 1. Open the tailgate. See Tailgate
on page 2‑7 .
2. Lift the two latches, located on
the inside of the tailgate, to remove the cover.
8. Push, pull (A) and then try to
turn (B) the tire. If the tire moves, use the wheel wrench to tighten the cable.
To store the jack tool bag and jack: 1. Return the tools to the jack
tool bag.
2. Secure the tool bag to the jack by securely wrapping the straps around the jack. Then, slide the straps through the rings on the bag and secure.
3. Reinstall the wing nut retainer to fasten the jack and tool bag under the rear seat. Make sure that the wing nut passes through the tool bag and the jack before tightening it.
4. Turn the wing nut retainer
clockwise to secure.
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Vehicle Care
5. Open the tool bag to find the
following tools, which are used to remove the spare tire and flat tire:
The spare tire is attached to the outside of the tailgate. To remove the spare tire:
3. Turn the wing nut
counterclockwise to release the jack tool bag and jack and remove them.
4. Release the straps that secure
the jack tool bag to the jack.
A. Wheel Wrench B. Jack Handle Extensions C. Jack Handle D. Jack E. Wheel Blocks
1.
If the vehicle has a spare tire cover release the latch by pulling the latch straight back and turning it away from the cover at the same time.
Notice: Opening the endgate before completely closing and latching the spare tire cover may result in damage to your vehicle. Close and latch the spare tire cover before opening the endgate to avoid possible damage.
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Removing the Flat Tire and Installing the Spare Tire 1. Do a safety check before
proceeding. See If a Tire Goes Flat on page 10‑64 for more information.
2. Remove the center cap,
3. Use the wheel wrench to remove
if equipped, by placing the flat end of the wheel wrench in the slot on the wheel and gently pry the center cap out.
the wheel nuts securing the spare tire. If the vehicle has locking lug nuts, the key is supplied in the tool bag. Use the key along with the wheel wrench to remove the wheel nuts from the tire.
4. You may need assistance to
remove the spare tire. Pull off and gently lower the spare tire to the ground. Set it next to the flat tire.
2. Remove the center cap by
placing the flat end of the wheel wrench in the slot on the wheel and gently pry the center cap out.
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Vehicle Care
5. Assemble the jack and tools as
follows:
3. Turn the wheel wrench
counterclockwise to loosen the wheel nuts. Do not remove them yet. If the vehicle has locking lug nuts, the key is supplied in the tool bag. Use the key along with the wheel wrench to remove the wheel nuts from the tire. Now jack up the vehicle.
Jacking Locations (Overall View)
A. Front Position - Lower
Control Arm
B. Rear Position - Lower Axle
4. Locate the vehicle's jacking
positions (A and B).
Front Position
Front Tire Flat: If the flat tire is on a front tire of the vehicle, use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack handle extensions. Attach the jack handle to the jack. From the front of the vehicle position the jack on the front lower control arm along the bar that runs front to back. Turn the wheel wrench clockwise to raise the vehicle.
Raise the vehicle far enough off the ground so there is enough room for the spare tire to clear the ground.
Rear Positions
Refer to the graphic above to locate the placement of the jack if the flat tire is on the rear of the vehicle.
Rear Tire Flat: Use the jack handle and both jack handle extensions. Attach the wheel wrench to the jack extensions. Attach the jack handle to the jack. From the rear of the vehicle align the jack under the rear axle. Turn the wheel wrench clockwise to raise the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to clear the ground.
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6. Turn the wheel wrench
clockwise to raise the jack head to the lifting point. { WARNING
Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack.
{ WARNING
Raising your vehicle with the jack improperly positioned can damage the vehicle and even make the vehicle fall. To help avoid personal injury and vehicle damage, be sure to fit the jack lift head into the proper location before raising the vehicle.
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Vehicle Care
7. Remove all the wheel nuts and
8. Remove any rust or dirt from the
take off the flat tire.
{ WARNING
Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after time. The wheel could come off and cause an accident. When changing a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. See If a Tire Goes Flat on page 10‑64.
wheel bolts, mounting surfaces and spare wheel.
{ WARNING
Never use oil or grease on bolts or nuts because the nuts might come loose. The vehicle's wheel could fall off, causing a crash.
9. Put the spare tire on the
mounting surface.
10. Put the wheel nuts back on with the rounded end of the nuts toward the wheel after mounting the spare.
11. Tighten each wheel nut by hand. Then use the wheel wrench to tighten the nuts until the wheel is held against the hub.
12. Turn the wheel wrench
counterclockwise to lower the vehicle. Lower the jack completely.
Notice: Improperly tightened wheel nuts can lead to brake pulsation and rotor damage. To avoid expensive brake repairs, evenly tighten the wheel nuts in the proper sequence and to the proper torque specification. See Capacities and Specifications on page 12‑2 for the wheel nut torque specification.
{ WARNING
Wheel nuts that are improperly or incorrectly tightened can cause the wheels to become loose or come off. The wheel nuts should be tightened with a torque wrench to the proper torque specification after replacing. Follow the torque specification supplied by the aftermarket manufacturer when using accessory locking wheel nuts. See Capacities and Specifications on page 12‑2 for original equipment wheel nut torque specifications.
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13. Tighten the nuts firmly in a
crisscross sequence as shown by turning the wheel wrench clockwise.
14. After installing the wheel and tire, reinstall the center cap. Place the cap on the wheel and tap it into place until it sits flush with the wheel.
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Vehicle Care
Storing a Flat or Spare Tire and Tools
{ WARNING
Storing a jack, a tire, or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all these in the proper place.
To store the flat or spare tire on the spare tire mount: 1. Slide the flat or spare tire onto
the swing-gate. You may need assistance to do this.
2. Reinstall the nuts to retain the
flat or spare tire.
3. Tighten the nuts by hand.
{ WARNING
Wheel nuts that are improperly or incorrectly tightened can cause the wheels to become loose or come off. The wheel nuts should be tightened with a torque wrench to the proper torque specification after replacing. Follow the torque specification supplied by the aftermarket manufacturer when using accessory locking wheel nuts. See Capacities and Specifications on page 12‑2 for original equipment wheel nut torque specifications.
4. Use the wheel wrench to tighten
the nuts firmly. Try to move the tire back and forth slightly to be sure it is secure.
5. Reinstall the center tire cover
6.
onto the spare or flat tire. If the vehicle has a spare tire cover close the cover and latch the side latch.
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10-83
To store the jack tool bag and jack: 1. Return the tools to the jack
tool bag.
3. Position the jack and jack tool
5. Turn the wing nut retainer
bag in the swing-gate. When reinstalling the jack and jack tool bag, make sure the jack base is securely seated behind the tabs in the swing-gate.
clockwise to secure.
6. Reinstall the compartment cover
by inserting the locator tabs in the holes in the swing-gate. Push the latches down to secure.
2. Secure the tool bag to the jack by securely wrapping the straps around the jack. Then, slide the straps through the rings on the bag and secure.
4. Reinstall the wing nut retainer to
fasten the jack and tool bag in the storage compartment. Make sure that the wing nut passes through the tool bag and the jack before tightening it.
To release the spare tire from the secondary latch:
{ WARNING
Someone standing too close during the procedure could be injured by the jack. If the spare tire does not slide off the jack completely, make sure no one is behind you or on either side of you as you pull the jack out from under the spare.
1.
If the cable is not visible, start this procedure at Step 3.
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Vehicle Care
Secondary Latch System This vehicle has an underbody mounted tire hoist assembly that has a secondary latch system. It is designed to stop the spare tire from suddenly falling off the vehicle if the cable holding the spare tire is damaged. For the secondary latch to work, the tire must be stowed with the valve stem pointing down. See Tire Changing (H3T) on page 10‑66 or Tire Changing (H3) on page 10‑75 for instructions on storing the spare tire correctly.
{ WARNING
Before beginning this procedure read all the instructions. Failure to read and follow the instructions could damage the hoist assembly and you and others could get hurt. Read and follow the instructions listed next.
2. Turn the lug wrench
counterclockwise until approximately 6 inches (15 cm) of cable is exposed.
3. Attach the lug wrench to the
jack and raise the jack at least 10 turns.
4. Place the jack under the vehicle,
ahead of the rear bumper. Position the center lift point of the jack under the center of the spare tire.
5. Turn the lug wrench clockwise to
raise the jack until it lifts the secondary latch spring.
6. Keep raising the jack until the
spare tire stops moving upward and is held firmly in place. This lets you know that the secondary latch has released and the spare tire is balancing on the jack.
7. Lower the jack by turning the lug wrench counterclockwise. Keep lowering the jack until the spare tire slides off the jack.
8. Disconnect the lug wrench from
the jack and carefully remove the jack. Use one hand to push against the spare tire while firmly pulling the jack out from under the spare tire with the other hand.
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10-85
9. Tilt the retainer and slip it
through the wheel opening when the spare tire has been completely lowered.
10. Turn the lug wrench clockwise to raise the cable back up if the cable is hanging.
Have the hoist shaft assembly inspected as soon as you can. You will not be able to store a spare tire using the hoist assembly until it has been repaired or replaced.
Full-Size Spare Tire The vehicle, when new, had a fully-inflated spare tire. A spare tire may lose air over time, so check its inflation pressure regularly. See Tire Pressure on page 10‑51 and Vehicle Load Limits on page 9‑27 for information regarding proper tire inflation and loading your vehicle. For instruction on how to remove, install or store a spare tire, see Tire Changing (H3T) on page 10‑66 or Tire Changing (H3) on page 10‑75.
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Vehicle Care
After installing the spare tire on your vehicle, you should stop as soon as possible and make sure the spare is correctly inflated. The spare tire does not have a Tire Pressure Monitor System sensor. You may get a low pressure warning light. See Tire Pressure Monitor Operation on page 10‑53. Have the damaged or flat road tire repaired or replaced as soon as you can. Do not mix tires and wheels of different sizes, because they will not fit. Keep your spare tire and its wheel together.
Jump Starting If the vehicle's battery has run down, you may want to use another vehicle and some jumper cables to start your vehicle. Be sure to use the following steps to do it safely.
{ WARNING
Batteries can hurt you. They can be dangerous because:
. They contain acid that can
burn you.
. They contain gas that can
explode or ignite.
. They contain enough electricity to burn you.
If you do not follow these steps exactly, some or all of these things can hurt you.
Notice: Ignoring these steps could result in costly damage to the vehicle that would not be covered by the warranty. Trying to start the vehicle by pushing or pulling it will not work, and it could damage the vehicle. 1. Check the other vehicle. It must
have a 12‐volt battery with a negative ground system.
Notice: If the other vehicle's system is not a 12-volt system with a negative ground, both vehicles can be damaged. Only use vehicles with 12-volt systems with negative grounds to jump start your vehicle. 2. Get the vehicles close enough
so the jumper cables can reach, but be sure the vehicles are not touching each other. If they are, it could cause a ground connection you do not want.
You would not be able to start your vehicle, and the bad grounding could damage the electrical systems. To avoid the possibility of the vehicles rolling, set the parking brake firmly on both vehicles involved in the jump start procedure. Put an automatic transmission in P (Park) or a manual transmission in Neutral before setting the parking brake. If you have a four-wheel-drive vehicle, be sure the transfer case is not in Neutral.
Notice: If you leave the radio or other accessories on during the jump starting procedure, they could be damaged. The repairs would not be covered by the warranty. Always turn off the radio and other accessories when jump starting the vehicle.
3. Turn off the ignition on both
vehicles. Unplug unnecessary accessories plugged into the cigarette lighter or the accessory power outlets. Turn off the radio and all lamps that are not needed. This will avoid sparks and help save both batteries. And it could save the radio!
4. Open the hoods and locate the batteries on both vehicles. You will use the positive (+) battery terminal and the remote negative (−) jump starting terminal to jump start your vehicle. To access the positive (+) battery terminal, open the terminal cover. See Engine Compartment Overview on page 10‑6 for more information on the terminal locations.
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10-87
{ WARNING
Using a match near a battery can cause battery gas to explode. People have been hurt doing this, and some have been blinded. Use a flashlight if you need more light. Be sure the batteries have enough water. You do not need to add water to the ACDelco® battery (or batteries) installed in your new vehicle. But if a battery has filler caps, be sure the right amount of fluid is there. If it is low, add water to take care of that first. If you do not, explosive gas could be present. Battery fluid contains acid that can burn you. Do not get it on you. If you accidentally get it in your eyes or on your skin, flush the place with water and get medical help immediately.
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Vehicle Care
{ WARNING
Fans or other moving engine parts can injure you badly. Keep your hands away from moving parts once the engine is running.
5. Check that the jumper cables do
not have loose or missing insulation. If they do, you could get a shock. The vehicles could be damaged too. Before you connect the cables, here are some basic things you should know. Positive (+) will go to positive (+) or to a remote positive (+) terminal if the vehicle has one. Negative (−) will go to a heavy, unpainted metal engine part or to a remote negative (−) terminal if the vehicle has one.
Do not let the other end touch anything until the next step. The other end of the negative (−) cable does not go to the dead battery. It goes to a heavy, unpainted metal engine part, or to a remote negative (−) terminal on the vehicle with the dead battery.
9. Connect the other end of the
negative (−) cable at least 18 inches (45 cm) away from the dead battery, but not near engine parts that move. The electrical connection is just as good there, and the chance of sparks getting back to the battery is much less. Your vehicle has a remote negative (−) terminal, marked GND (Ground), for this purpose.
Do not connect positive (+) to negative (−) or you will get a short that would damage the battery and maybe other parts too. And do not connect the negative (−) cable to the negative (−) terminal on the dead battery because this can cause sparks.
6. Connect the red positive (+)
cable to the positive (+) terminal of the dead battery. Use a remote positive (+) terminal if the vehicle has one.
7. Do not let the other end touch
metal. Connect it to the positive (+) terminal of the good battery. Use a remote positive (+) terminal if the vehicle has one.
8. Now connect the black
negative (−) cable to the negative (−) terminal of the good battery. Use a remote negative (−) terminal if the vehicle has one.
10. Now start the vehicle with the
good battery and run the engine for a while.
11. Try to start the vehicle that
had the dead battery. If it will not start after a few tries, it probably needs service.
Notice: If the jumper cables are connected or removed in the wrong order, electrical shorting may occur and damage the vehicle. The repairs would not be covered by the vehicle warranty. Always connect and remove the jumper cables in the correct order, making sure that the cables do not touch each other or other metal.
Jumper Cable Removal
A. Heavy, Unpainted Metal Engine
Part or Remote Negative (−) Terminal
