Adjustments
46 notice on the active head restraints on
page 48.
The conceptYou adjust the seat in two stages:
1Preselect the function: the button lights
up brightly
2Adjustments: slide control knob to
>front or rear or
>up or down
>or rotate Electric power seat adjustment You can use the control knob to adjust
various functions after first selecting them
with the buttons.
To ensure that the safety systems
continue to provide optimal protec-
tion, please observe the adjustment
instructions on page 45.<
1Forward/backward:
Height:
Backrest:
This button is always ready for operation
2Thigh support:
Height:
Tilt angle Ð driver's seat only:3Lumbar support
*: see below
Comfort seat* front adjustment In addition to the electric power seat func-
tions, several other adjustment options are
also available with the comfort seat:
2Thigh support:
Tilt angle Ð also on front passenger's
side:
3Lumbar support, see below
Backrest width:
Increase or decrease lateral support
4Shoulder support, see below
Head restraint height
Backrest: Lumbar support adjustment1Lumbar support
You can also adjust the contours of the
backrest to obtain additional support in the
lumbar region.
The upper hips and spinal column receive
supplementary support to help you main-
tain a relaxed, upright sitting position.
Increase or decrease curvature
Increase curvature at top or bottom. Shoulder support adjustment
Wheels and tires
172
Tire replacement To maintain good handling and vehicle
response, use only tires of a single tread
configuration from a single manufacturer.
BMW tests and approves specific wheel
and tire combinations. DOT Quality Grades Treadwear
Traction AA A B C
Temperature A B C
All passenger car tires must conform
to Federal Safety Requirements in
addition to these grades.< TreadwearThe 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 one-half (1g) 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.TractionThe 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 govern-
ment test surfaces of asphalt and concrete.
A tire marked C may have poor traction
performance.
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.< TemperatureThe 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.
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 combina-
tion, can cause heat buildup and possible
tire failure.<
Uniform Tire Quality Grading Quality grades can be found where appli-
cable on the tire sidewall between tread
shoulder and maximum section width. For
example:
Treadwear 200 Traction AA
Temperature A
Do not use retreaded tires, since
driving safety may be impaired.
Possible variations in the design and the
age (which could be substantial) of the
carcasses can lead to unusually rapid
wear.< Tire age The tire's date of manufacture is indicated
on the sidewall:
DOT ... 4901 indicates that a tire was
manufactured in week 49 of the year 2001.
Regardless of milage or wear, BMW
recommends that you replace all tires Ð
including the spare tire Ð after a maximum
of 6 years, even though the tires may have
a theoretical service life of up to 10 years.
Volume
Ð audio 141
Ð navigation 133
Ð voice command
system 141WWarning lamps 15
Warnings 80
Warning triangle 187
Washing the vehicle, refer
to separate Car care
manual
"WB" 140
WB 145
Wear indicators in the
tires 171
Weather Band 145
Weights 194
Wheel and tire
combinations 173
Wheelbase 193
Wheels and tires 173
Width 193
Windows 42
Ð convenience mode 37
Ð safety switch 43
Windshield defroster, see
Defrosting windows 101
Windshield washers 73
Windshield wiper 71, 72
Windshield wiper intermit-
tent mode, refer to Rain
sensor 71
Windshield wiper
system 72
Winter tires 173
Ð setting speed limit 84
Wiper blade
replacement 181
Wiper system 71
"With map" for
navigation 128, 129
Wordmatch principle with
navigation system 136
Working in the engine
compartment 175
XXenon lamps 182
