wheel CADILLAC CTS 2007 1.G Repair Manual

The high-performance tires, size P225/55R16,
P225/50R17 or P225/50R18 require ination
pressure adjustment when driving your vehicle at
speeds of 100 mph (160 km/h) or higher. Set
the cold tire ination pressure to the maximum
ination pressure shown on the tire sidewall,
or 38 psi (262 kPa), whichever is lower. See the
example following.
Example:
You will nd the maximum load and ination
pressure molded on the tire’s sidewall, in small
letters, near the rim ange. It will read something
like this: Maximum load 710 kg (1565 lbs)
350 kPa (51 psi) Max. Press.
For this example, you would set the cold ination
pressure for high-speed driving at 38 psi (262 kPa)
When you end high-speed driving, return the tires
to the cold ination pressures shown on the
tire and loading information label. SeeLoading
Your Vehicle on page 321.Tire Pressure Monitor System
Your vehicle may have a Tire Pressure Monitor
System (TPMS). This system uses radio and
sensor technology to check tire pressure levels.
If your vehicle has this feature, sensors are
mounted on each the tire and wheel assembly,
except for the spare tire. The TPMS sensors
monitor the air pressure in the vehicle’s tires and
transmits the tire pressure readings to a receiver
located in the vehicle.
If your vehicle has the base audio system, the
Driver Information Center (DIC) displays TPMS
warnings and messages on the radio’s display
screen. SeeSystem Controls on page 223
andDIC Warnings and Messages on page 232for
additional information and details about the DIC
operation and displays. If your vehicle has
the Navigation system, TPMS warnings and
messages are displayed on the message center
screen, located inside the tachometer. See
Message Center (CTS-V) on page 215for
information about the message center operation
and displays.
405

Your vehicle’s TPMS can alert you about a low
tire pressure condition but it does not replace
normal tire maintenance. SeeTire Inspection and
Rotation on page 409andTires on page 392.
Notice:Do not use a tire sealant if your vehicle
has Tire Pressure Monitors. The liquid sealant
can damage the tire pressure monitor sensors.
Resetting the TPMS Identication
Codes
Each TPMS sensor has a unique identication
code. Any time you replace one or more of
the TPMS sensors or rotate the tires, the
identication codes will need to be matched to the
new tire and wheel position. The sensors are
matched to the tire and wheel positions in
the following order: driver’s side front tire,
passenger’s side front tire, passenger’s side rear
tire, and driver’s side rear tire using a TPMS
diagnostic tool. See your GM dealer for service.
The TPMS sensors may also be matched to each
tire and wheel position by increasing or
decreasing the tire’s air pressure. When increasing
tire pressure do not exceed the maximum
ination pressure indicated on the tire’s sidewall.You will have two minutes to match the rst tire
and wheel position, and ve minutes overall
to match all four tire and wheel positions. If it takes
longer than two minutes, to match the rst tire
and wheel, or more than ve minutes to match all
four tire and wheel positions the matching
process stops and you will need to start over.
The TPM matching process is outlined below:
1. Set the parking brake.
2. Turn the ignition switch to ON with the
engine off.
3. Using the Remote Keyless Entry (RKE)
transmitter, lock and unlock the vehicle’s
doors.
4. Press the lock and unlock buttons, at the
same time, on the RKE transmitter. A single
horn chirp will sound, indicating that the
TPMS system is ready, and the sensor
matching process can begin.
5. Start with the driver’s side front tire.
407

6. Remove the valve cap from the valve stem.
Activate the TPMS sensor by increasing
or decreasing the tire’s air pressure for
ve seconds, or until a horn chirp sounds. The
horn chirp, which may take up to 30 seconds,
conrms that the sensor identication code has
been matched to this tire position. To decrease
the tire’s air-pressure use the pointed end of
the valve cap, a pencil-style air pressure gage,
or a key.
7. Proceed to the passenger’s side front tire, and
repeat the procedure in Step 6.
8. Proceed to the passenger’s side rear tire, and
repeat the procedure in Step 6.
9. Proceed to the driver’s side rear tire, and
repeat the procedure in Step 6.
10. After hearing the conrming double horn
chirp, for the left rear tire, exit the matching
process by turning the ignition switch to OFF.
11. Set all four tires to the recommended
air pressure level as indicated on the tire and
loading information label.
12. Put the valve caps back on the valve stems.The TPMS will not function properly, if one or
more of the TPMS sensors are missing or
inoperable. If your vehicle has a compact spare
tire, the spare tire and wheel assembly does
not contain a TPMS sensor. If you replace one of
the road tires with the spare, or if the system
detects a missing or inoperable sensor, the
Service Tire Monitor System message will be
displayed on the DIC. If you have replaced a tire
and wheel assembly without transferring the
TPMS sensors, the error message will be
displayed. Once you re-install the TPMS sensors,
the message should go off. See your GM
dealer for service if all TPMS sensors are installed
and the error message comes on and stays on.
Have your vehicle serviced as soon as possible.
If your vehicle has a message center and the
system detects a missing or inoperable sensor an
error message of several dashes–––will be
shown on the message center display. If you have
replaced a tire and wheel assembly without
transferring the TPMS sensors, the error message
will be displayed. Once you re-install the TPMS
sensors, the error message should go off.
See your GM dealer for service if all TPMS
sensors are installed and the error message
comes on and stays on.
408

Federal Communications Commission
(FCC) and Industry and Science Canada
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following
two conditions:
1. This device may not cause harmful
interference.
2. This device must accept any interference
received, including interference that may
cause undesired operation.
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
1. This device may not cause interference.
2. This device must accept any interference
received, including interference that may
cause undesired operation of the device.
Changes or modications to this system by other
than an authorized service facility could void
authorization to use this equipment.
Tire Inspection and Rotation
Tires should be rotated every 5,000 to 8,000 miles
(8 000 to 13 000 km).
If your vehicle has P245/45ZR18 96W size tires,
GM recommends rotating these tires at 3,000 mile
(4 800 km) intervals. These tires are optimized for
dry traction and handling performance. Tread life
may be 15,000 miles (24 140 km) or less for these
tires, depending on how and where you drive.
Any time you notice unusual wear, rotate your
vehicle’s tires as soon as possible and check
wheel alignment. Also check for damaged tires or
wheels. SeeWhen It Is Time for New Tires on
page 411andWheel Replacement on page 416for
more information.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The
rst rotation is the most important. SeeScheduled
Maintenance on page 462.
409

When rotating your vehicle’s tires, always use the
correct rotation pattern shown here.
If your vehicle has a compact spare tire, do not
include it in the tire rotation.
After the tires have been rotated, adjust the front
and rear ination pressures as shown on the Tire
and Loading Information label. SeeLoading Your
Vehicle on page 321, for an example of the tire and
loading information label and its location on your
vehicle.
If your vehicle has the Tire Pressure Monitor
System (TPMS) the TPMS sensors will need to be
reset and matched to the tire/wheel position. A
special TPMS diagnostic tool is used to reset the
sensor identication codes. See your dealer for
service.Make certain that all wheel nuts are properly
tightened. See “Wheel Nut Torque” under
Capacities and Specications on page 457.
{CAUTION:
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
you change a wheel, remove any rust or
dirt from places where the wheel attaches
to the vehicle. In an emergency, you can
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. SeeChanging a Flat Tire (CTS Only)
on page 424.
410

TPC Spec code has not been molded onto the
tire’s sidewall. If your vehicle has these tires, and
you need to replace them, you can still get
these TPC Spec rated tires by asking your
GM dealer. Your GM dealer can order these tires
by part number. This way, your vehicle will
continue to give the proper endurance, handling,
traction, and ride as the original tires.
Winter tires with the same speed rating as your
vehicle’s original equipment tires may not be
available for H, V, W, and ZR speed rated tires.
If you choose snow tires with a lower speed rating,
never exceed the tire’s maximum speed capability.
{CAUTION:
Mixing tires could cause you to lose
control of your vehicle 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 all wheels.
Your vehicle may have a compact spare
tire and wheel assembly. It is all right to
drive with your vehicle’s compact spare
tire temporarily. It was developed for use
on your vehicle. SeeCompact Spare Tire
(CTS Only) on page 434.
412

{CAUTION:
If you use bias-ply tires on your vehicle,
the wheel rim anges 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 your 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 that have 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. SeeTire Pressure
Monitor System on page 405.
Your vehicle’s original equipment tires are listed
on the Tire and Loading Information Label.
This label is attached to the vehicle’s center pillar
(B-pillar). SeeLoading Your Vehicle on page 321,
for more information about the Tire and Loading
Information Label and its location on your vehicle.
413

Different Size Tires and Wheels
If you add wheels or tires that are a different size
than your original equipment wheels and tires,
this may 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, traction control,
and electronic stability control, the performance
of these systems can be affected.
{CAUTION:
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 GM specic wheel and
tire systems developed for your vehicle,
and have them properly installed by a GM
certied technician.SeeBuying New Tires on page 411and
Accessories and Modications on page 332for
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, 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.
414

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
specied 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 Vehicle 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 inated
and not overloaded. Excessive speed,
underination, 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 your vehicle were aligned
and balanced carefully at the factory to give you
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 you notice unusual tire wear or your
vehicle pulling to one side or the other, the
alignment may need to be checked. If you notice
your vehicle vibrating when driving on a smooth
road, your tires and wheels may need to be
rebalanced. See your dealer/retailer 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/retailer if any of these conditions exist.
Your dealer/retailer will know the kind of wheel
you need.
416

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 your wheels,
wheel bolts, or wheel nuts, replace them only with
new GM original equipment parts. This way,
you will be sure to have the right wheel, wheel
bolts, and wheel nuts for your vehicle.
{CAUTION:
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.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.
SeeChanging a Flat Tire (CTS Only) on page 424
for more information.
Used Replacement Wheels
{CAUTION:
Putting a used wheel on your 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.
417