traction control CHEVROLET IMPALA 2009 9.G Owner's Manual

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, antilock 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 5-69andAccessories
and Modifications on page 5-3for 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.
While the tires available on General Motors
passenger cars and 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.
5-71

Treadwear
The treadwear grade is a comparative rating based
on the wear rate of the tire when tested under
controlled conditions on a specied government
test course. For example, a tire graded 150 would
wear one and a half (1.5) 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 signicantly 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 specied government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.
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. It should be noted that
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.
5-72

Lights (cont.)
Fog Lamp ..................................................3-40
Highbeam On.............................................3-40
High/Low Beam Changer................................ 3-8
Oil Pressure...............................................3-39
Passenger Airbag Status Indicator..................3-29
Safety Belt Reminders..................................3-27
Security.....................................................3-39
Tire Pressure..............................................3-35
Traction Control System (TCS) Warning..........3-32
Loading Your Vehicle.......................................4-20
Locks
Automatic Door Lock....................................2-10
Delayed Locking..........................................2-10
Door ........................................................... 2-9
Lockout Protection.......................................2-12
Power Door ................................................2-10
Programmable Automatic Door Unlock............2-11
Rear Door Security Locks.............................2-11
Loss of Control...............................................4-11
Lower Anchors and Tethers for Children.............1-45
Lumbar
Manual Controls............................................ 1-6M
Maintenance
Footnotes..................................................... 6-7
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill........................................... 6-8
At Least Once a Month.................................. 6-9
At Least Once a Year.................................... 6-9
Maintenance Record....................................6-15
Maintenance Replacement Parts....................6-13
Maintenance Requirements............................. 6-2
Owner Checks and Services........................... 6-8
Recommended Fluids and Lubricants.............6-12
Scheduled Maintenance................................. 6-4
Using.......................................................... 6-3
Your Vehicle and the Environment................... 6-2
Malfunction Indicator Lamp...............................3-36
Manual Lumbar Controls.................................... 1-6
Manual Seats................................................... 1-4
Message
DIC Warnings and Messages........................3-49
Mirror Reading Lamps.....................................3-17
8

Tires (cont.)
Ination - Tire Pressure................................5-60
Inspection and Rotation................................5-67
Installing the Spare Tire................................5-79
Pressure Monitor Operation...........................5-63
Pressure Monitor System..............................5-62
Removing the Flat Tire.................................5-79
Removing the Spare Tire and Tools...............5-77
Sidewall Labeling.........................................5-54
Storing a Flat or Spare Tire and Tools............5-85
Terminology and Denitions...........................5-57
Uniform Tire Quality Grading.........................5-71
Wheel Alignment and Tire Balance.................5-73
Wheel Replacement.....................................5-73
When It Is Time for New Tires......................5-68
Towing
Recreational Vehicle.....................................4-26
Towing a Trailer..........................................4-28
Your Vehicle...............................................4-26
Traction
Control System (TCS).................................... 4-8
Control System Warning Light.......................3-32
Transmission
Fluid, Automatic...........................................5-24
Transmission Operation, Automatic....................2-24
Transportation, Courtesy..................................7-11
Trunk............................................................2-12
Turn and Lane-Change Signals.......................... 3-7
Turn Signal/Multifunction Lever........................... 3-7U
Uniform Tire Quality Grading............................5-71
Universal Home Remote System.......................2-36
Operation...................................................2-37
V
Vehicle
Control........................................................ 4-3
Loading......................................................4-20
Running While Parked..................................2-31
Symbols......................................................... iii
Vehicle Customization, DIC..............................3-57
Vehicle Data Recording and Privacy..................7-18
Vehicle Data Recording, Radio
Frequency (RFID)........................................7-19
Vehicle Identication
Number (VIN).............................................5-96
Service Parts Identication Label...................5-96
Vehicle, Remote Start....................................... 2-7
Ventilation Adjustment......................................3-23
Visors...........................................................2-16
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