3-38 Audio Steering Wheel Controls
(If Equipped)
If your vehicle has this feature, you can control certain
radio functions using the buttons on your steering wheel.
Some steering wheel controls may operate climate
controls. See ªSteering Wheel Controls for Climate
Controlº earlier in this section.
VOL: Press the up or down arrow to increase or
decrease volume.SEEK: Press the up arrow to tune to a higher radio
station and the down arrow to tune to a lower radio
station. The sound will mute while seeking. When
playing a cassette tape or a compact disc, press SEEK to
hear the next selection.
AM
-FM: Press this button to choose AM, FM1 or FM2.
SCAN: Press this button to scan your radio
preset stations.
SOURCE: If you have radio
-only controls, you will
have this control. Press SOURCE to play a cassette tape
or compact disc when the radio is playing. If both a tape
and disc are installed, the system will first go to tape
play. Press SOURCE again to go to disc play.
MUTE: If you have radio
-only controls, you will have
this control. Press MUTE to silence the system. Press it
again to turn on the sound.
6-49 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, 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
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.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.
For example, a tire graded 150 would wear one and
a half (1 1/2) 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.
